diff --git a/Makefile b/Makefile index 34cec49d3af4..afb9d538a203 100644 --- a/Makefile +++ b/Makefile @@ -1,1237 +1,1250 @@ # Make and install tzdb code and data. # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. # Package name for the code distribution. PACKAGE= tzcode # Version number for the distribution, overridden in the 'tarballs' rule below. VERSION= unknown # Email address for bug reports. BUGEMAIL= tz@iana.org # DATAFORM selects the data format. # Available formats represent essentially the same data, albeit # possibly with minor discrepancies that users are not likely to notice. # To get new features and the best data right away, use: # DATAFORM= vanguard # To wait a while before using new features, to give downstream users # time to upgrade zic (the default), use: # DATAFORM= main # To wait even longer for new features, use: # DATAFORM= rearguard # Rearguard users might also want "ZFLAGS = -b fat"; see below. DATAFORM= main # Change the line below for your timezone (after finding the one you want in # one of the $(TDATA) source files, or adding it to a source file). # Alternatively, if you discover you've got the wrong timezone, you can just # 'zic -l -' to remove it, or 'zic -l rightzone' to change it. # Use the command # make zonenames # to get a list of the values you can use for LOCALTIME. LOCALTIME= Factory # The POSIXRULES macro controls interpretation of nonstandard and obsolete # POSIX-like TZ settings like TZ='EET-2EEST' that lack DST transition rules. # Such a setting uses the rules in a template file to determine # "spring forward" and "fall back" days and times; the environment # variable itself specifies UT offsets of standard and daylight saving time. # # If POSIXRULES is '-', no template is installed; this is the default. # # Any other value for POSIXRULES is obsolete and should not be relied on, as: # * It does not work correctly in popular implementations such as GNU/Linux. # * It does not work even in tzcode, except for historical timestamps # that precede the last explicit transition in the POSIXRULES file. # Hence it typically does not work for current and future timestamps. # In short, software should avoid ruleless settings like TZ='EET-2EEST' # and so should not depend on the value of POSIXRULES. # # If, despite the above, you want a template for handling these settings, # you can change the line below (after finding the timezone you want in the # one of the $(TDATA) source files, or adding it to a source file). # Alternatively, if you discover you've got the wrong timezone, you can just # 'zic -p -' to remove it, or 'zic -p rightzone' to change it. # Use the command # make zonenames # to get a list of the values you can use for POSIXRULES. POSIXRULES= - # Also see TZDEFRULESTRING below, which takes effect only # if the time zone files cannot be accessed. # Installation locations. # # The defaults are suitable for Debian, except that if REDO is # posix_right or right_posix then files that Debian puts under # /usr/share/zoneinfo/posix and /usr/share/zoneinfo/right are instead # put under /usr/share/zoneinfo-posix and /usr/share/zoneinfo-leaps, # respectively. Problems with the Debian approach are discussed in # the commentary for the right_posix rule (below). # Destination directory, which can be used for staging. # 'make DESTDIR=/stage install' installs under /stage (e.g., to # /stage/etc/localtime instead of to /etc/localtime). Files under # /stage are not intended to work as-is, but can be copied by hand to # the root directory later. If DESTDIR is empty, 'make install' does # not stage, but installs directly into production locations. DESTDIR = # Everything is installed into subdirectories of TOPDIR, and used there. # TOPDIR should be empty (meaning the root directory), # or a directory name that does not end in "/". # TOPDIR should be empty or an absolute name unless you're just testing. TOPDIR = # The default local timezone is taken from the file TZDEFAULT. TZDEFAULT = $(TOPDIR)/etc/localtime # The subdirectory containing installed program and data files, and # likewise for installed files that can be shared among architectures. # These should be relative file names. USRDIR = usr USRSHAREDIR = $(USRDIR)/share # "Compiled" timezone information is placed in the "TZDIR" directory # (and subdirectories). # TZDIR_BASENAME should not contain "/" and should not be ".", ".." or empty. TZDIR_BASENAME= zoneinfo TZDIR = $(TOPDIR)/$(USRSHAREDIR)/$(TZDIR_BASENAME) # The "tzselect" and (if you do "make INSTALL") "date" commands go in: BINDIR = $(TOPDIR)/$(USRDIR)/bin # The "zdump" command goes in: ZDUMPDIR = $(BINDIR) # The "zic" command goes in: ZICDIR = $(TOPDIR)/$(USRDIR)/sbin # Manual pages go in subdirectories of. . . MANDIR = $(TOPDIR)/$(USRSHAREDIR)/man # Library functions are put in an archive in LIBDIR. LIBDIR = $(TOPDIR)/$(USRDIR)/lib # Types to try, as an alternative to time_t. TIME_T_ALTERNATIVES = $(TIME_T_ALTERNATIVES_HEAD) $(TIME_T_ALTERNATIVES_TAIL) TIME_T_ALTERNATIVES_HEAD = int_least64_t TIME_T_ALTERNATIVES_TAIL = int_least32_t uint_least32_t uint_least64_t # What kind of TZif data files to generate. (TZif is the binary time # zone data format that zic generates; see Internet RFC 8536.) # If you want only POSIX time, with time values interpreted as # seconds since the epoch (not counting leap seconds), use # REDO= posix_only # below. If you want only "right" time, with values interpreted # as seconds since the epoch (counting leap seconds), use # REDO= right_only # below. If you want both sets of data available, with leap seconds not # counted normally, use # REDO= posix_right # below. If you want both sets of data available, with leap seconds counted # normally, use # REDO= right_posix # below. POSIX mandates that leap seconds not be counted; for compatibility # with it, use "posix_only" or "posix_right". Use POSIX time on systems with # leap smearing; this can work better than unsmeared "right" time with # applications that are not leap second aware, and is closer to unsmeared # "right" time than unsmeared POSIX time is (e.g., 0.5 vs 1.0 s max error). REDO= posix_right # Whether to put an "Expires" line in the leapseconds file. # Use EXPIRES_LINE=1 to put the line in, 0 to omit it. # The EXPIRES_LINE value matters only if REDO's value contains "right". # If you change EXPIRES_LINE, remove the leapseconds file before running "make". # zic's support for the Expires line was introduced in tzdb 2020a, # and was modified in tzdb 2021b to generate version 4 TZif files. # EXPIRES_LINE defaults to 0 for now so that the leapseconds file # can be given to pre-2020a zic implementations and so that TZif files # built by newer zic implementations can be read by pre-2021b libraries. EXPIRES_LINE= 0 # To install data in text form that has all the information of the TZif data, # (optionally incorporating leap second information), use # TZDATA_TEXT= tzdata.zi leapseconds # To install text data without leap second information (e.g., because # REDO='posix_only'), use # TZDATA_TEXT= tzdata.zi # To avoid installing text data, use # TZDATA_TEXT= TZDATA_TEXT= leapseconds tzdata.zi # For backward-compatibility links for old zone names, use # BACKWARD= backward # To omit these links, use # BACKWARD= BACKWARD= backward # If you want out-of-scope and often-wrong data from the file 'backzone', # but only for entries listed in the backward-compatibility file zone.tab, use # PACKRATDATA= backzone # PACKRATLIST= zone.tab # If you want all the 'backzone' data, use # PACKRATDATA= backzone # PACKRATLIST= # To omit this data, use # PACKRATDATA= # PACKRATLIST= PACKRATDATA= PACKRATLIST= # The name of a locale using the UTF-8 encoding, used during self-tests. # The tests are skipped if the name does not appear to work on this system. UTF8_LOCALE= en_US.utf8 # Non-default libraries needed to link. +# On some hosts, this should have -lintl unless CFLAGS has -DHAVE_GETTEXT=0. LDLIBS= # Add the following to the end of the "CFLAGS=" line as needed to override # defaults specified in the source code. "-DFOO" is equivalent to "-DFOO=1". # -DDEPRECATE_TWO_DIGIT_YEARS for optional runtime warnings about strftime # formats that generate only the last two digits of year numbers # -DEPOCH_LOCAL if the 'time' function returns local time not UT # -DEPOCH_OFFSET=N if the 'time' function returns a value N greater # than what POSIX specifies, assuming local time is UT. # For example, N is 252460800 on AmigaOS. # -DHAVE_DECL_ASCTIME_R=0 if does not declare asctime_r # -DHAVE_DECL_ENVIRON if declares 'environ' +# -DHAVE_DECL_TIMEGM=0 if does not declare timegm # -DHAVE_DIRECT_H if mkdir needs (MS-Windows) -# -DHAVE_GENERIC=0 if _Generic does not work -# -DHAVE_GETRANDOM if getgrandom works (e.g., GNU/Linux)* -# -DHAVE_GETTEXT if 'gettext' works (e.g., GNU/Linux, FreeBSD, Solaris)* +# -DHAVE_GENERIC=0 if _Generic does not work* +# -DHAVE_GETRANDOM if getrandom works (e.g., GNU/Linux), +# -DHAVE_GETRANDOM=0 to avoid using getrandom +# -DHAVE_GETTEXT if gettext works (e.g., GNU/Linux, FreeBSD, Solaris), +# where LDLIBS also needs to contain -lintl on some hosts; +# -DHAVE_GETTEXT=0 to avoid using gettext # -DHAVE_INCOMPATIBLE_CTIME_R if your system's time.h declares # ctime_r and asctime_r incompatibly with the POSIX standard # (Solaris when _POSIX_PTHREAD_SEMANTICS is not defined). -# -DHAVE_INTTYPES_H if you have a non-C99 compiler with +# -DHAVE_INTTYPES_H=0 if does not work* # -DHAVE_LINK=0 if your system lacks a link function # -DHAVE_LOCALTIME_R=0 if your system lacks a localtime_r function # -DHAVE_LOCALTIME_RZ=0 if you do not want zdump to use localtime_rz # localtime_rz can make zdump significantly faster, but is nonstandard. # -DHAVE_MALLOC_ERRNO=0 if malloc etc. do not set errno on failure. # -DHAVE_POSIX_DECLS=0 if your system's include files do not declare # functions like 'link' or variables like 'tzname' required by POSIX # -DHAVE_SETENV=0 if your system lacks the setenv function # -DHAVE_SNPRINTF=0 if your system lacks the snprintf function -# -DHAVE_STDINT_H if you have a non-C99 compiler with * +# -DHAVE_STDCKDINT_H=0 if neither nor substitutes like +# __builtin_add_overflow work* +# -DHAVE_STDINT_H=0 if does not work* # -DHAVE_STRFTIME_L if declares locale_t and strftime_l # -DHAVE_STRDUP=0 if your system lacks the strdup function # -DHAVE_STRTOLL=0 if your system lacks the strtoll function # -DHAVE_SYMLINK=0 if your system lacks the symlink function -# -DHAVE_SYS_STAT_H=0 if your compiler lacks a * +# -DHAVE_SYS_STAT_H=0 if does not work* # -DHAVE_TZSET=0 if your system lacks a tzset function -# -DHAVE_UNISTD_H=0 if your compiler lacks a * -# -DHAVE_UTMPX_H=0 if your compiler lacks a * +# -DHAVE_UNISTD_H=0 if does not work* +# -DHAVE_UTMPX_H=0 if does not work* # -Dlocale_t=XXX if your system uses XXX instead of locale_t # -DRESERVE_STD_EXT_IDS if your platform reserves standard identifiers # with external linkage, e.g., applications cannot define 'localtime'. # -Dssize_t=long on hosts like MS-Windows that lack ssize_t # -DSUPPRESS_TZDIR to not prepend TZDIR to file names; this has # security implications and is not recommended for general use # -DTHREAD_SAFE to make localtime.c thread-safe, as POSIX requires; # not needed by the main-program tz code, which is single-threaded. # Append other compiler flags as needed, e.g., -pthread on GNU/Linux. # -Dtime_tz=\"T\" to use T as the time_t type, rather than the system time_t # This is intended for internal use only; it mangles external names. # -DTZ_DOMAIN=\"foo\" to use "foo" for gettext domain name; default is "tz" # -DTZ_DOMAINDIR=\"/path\" to use "/path" for gettext directory; # the default is system-supplied, typically "/usr/lib/locale" # -DTZDEFRULESTRING=\",date/time,date/time\" to default to the specified # DST transitions if the time zone files cannot be accessed # -DUNINIT_TRAP if reading uninitialized storage can cause problems # other than simply getting garbage data # -DUSE_LTZ=0 to build zdump with the system time zone library # Also set TZDOBJS=zdump.o and CHECK_TIME_T_ALTERNATIVES= below. # -DZIC_BLOAT_DEFAULT=\"fat\" to default zic's -b option to "fat", and # similarly for "slim". Fat TZif files work around incompatibilities # and bugs in some TZif readers, notably older ones that # ignore or otherwise mishandle 64-bit data in TZif files; # however, fat TZif files may trigger bugs in newer TZif readers. # Slim TZif files are more efficient, and are the default. # -DZIC_MAX_ABBR_LEN_WO_WARN=3 # (or some other number) to set the maximum time zone abbreviation length # that zic will accept without a warning (the default is 6) # $(GCC_DEBUG_FLAGS) if you are using recent GCC and want lots of checking # # * Options marked "*" can be omitted if your compiler is C23 compatible. # # Select instrumentation via "make GCC_INSTRUMENT='whatever'". GCC_INSTRUMENT = \ -fsanitize=undefined -fsanitize-address-use-after-scope \ -fsanitize-undefined-trap-on-error -fstack-protector # Omit -fanalyzer from GCC_DEBUG_FLAGS, as it makes GCC too slow. GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ $(GCC_INSTRUMENT) \ -Wall -Wextra \ -Walloc-size-larger-than=100000 -Warray-bounds=2 \ -Wbad-function-cast -Wbidi-chars=any,ucn -Wcast-align=strict -Wdate-time \ -Wdeclaration-after-statement -Wdouble-promotion \ -Wduplicated-branches -Wduplicated-cond \ -Wformat=2 -Wformat-overflow=2 -Wformat-signedness -Wformat-truncation \ - -Winit-self -Wlogical-op \ + -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op \ -Wmissing-declarations -Wmissing-prototypes -Wnested-externs \ -Wnull-dereference \ -Wold-style-definition -Woverlength-strings -Wpointer-arith \ -Wshadow -Wshift-overflow=2 -Wstrict-overflow \ -Wstrict-prototypes -Wstringop-overflow=4 \ -Wstringop-truncation -Wsuggest-attribute=cold \ -Wsuggest-attribute=const -Wsuggest-attribute=format \ -Wsuggest-attribute=malloc \ -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure \ -Wtrampolines -Wundef -Wuninitialized -Wunused-macros -Wuse-after-free=3 \ -Wvariadic-macros -Wvla -Wwrite-strings \ -Wno-address -Wno-format-nonliteral -Wno-sign-compare \ - -Wno-type-limits -Wno-unused-parameter + -Wno-type-limits # # If your system has a "GMT offset" field in its "struct tm"s # (or if you decide to add such a field in your system's "time.h" file), # add the name to a define such as # -DTM_GMTOFF=tm_gmtoff # to the end of the "CFLAGS=" line. If not defined, the code attempts to # guess TM_GMTOFF from other macros; define NO_TM_GMTOFF to suppress this. # Similarly, if your system has a "zone abbreviation" field, define # -DTM_ZONE=tm_zone # and define NO_TM_ZONE to suppress any guessing. Although these two fields # not required by POSIX, a future version of POSIX is planned to require them # and they are widely available on GNU/Linux and BSD systems. # # The next batch of options control support for external variables # exported by tzcode. In practice these variables are less useful # than TM_GMTOFF and TM_ZONE. However, most of them are standardized. # # # # To omit or support the external variable "tzname", add one of: # # -DHAVE_TZNAME=0 # do not support "tzname" # # -DHAVE_TZNAME=1 # support "tzname", which is defined by system library # # -DHAVE_TZNAME=2 # support and define "tzname" # # to the "CFLAGS=" line. "tzname" is required by POSIX 1988 and later. # # If not defined, the code attempts to guess HAVE_TZNAME from other macros. # # Warning: unless time_tz is also defined, HAVE_TZNAME=1 can cause # # crashes when combined with some platforms' standard libraries, # # presumably due to memory allocation issues. # # # # To omit or support the external variables "timezone" and "daylight", add # # -DUSG_COMPAT=0 # do not support # # -DUSG_COMPAT=1 # support, and variables are defined by system library # # -DUSG_COMPAT=2 # support and define variables # # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by # # Unix Systems Group code and are required by POSIX 2008 (with XSI) and later. # # If not defined, the code attempts to guess USG_COMPAT from other macros. # # # # To support the external variable "altzone", add # # -DALTZONE=0 # do not support # # -DALTZONE=1 # support "altzone", which is defined by system library # # -DALTZONE=2 # support and define "altzone" # # to the end of the "CFLAGS=" line; although "altzone" appeared in # # System V Release 3.1 it has not been standardized. # # If not defined, the code attempts to guess ALTZONE from other macros. # # If you want functions that were inspired by early versions of X3J11's work, # add # -DSTD_INSPIRED -# to the end of the "CFLAGS=" line. This arranges for the functions -# "offtime", "timelocal", "timegm", "timeoff", -# "posix2time", and "time2posix" to be added to the time conversion library. +# to the end of the "CFLAGS=" line. This arranges for the following +# functions to be added to the time conversion library. # "offtime" is like "gmtime" except that it accepts a second (long) argument # that gives an offset to add to the time_t when converting it. # "timelocal" is equivalent to "mktime". -# "timegm" is like "timelocal" except that it turns a struct tm into -# a time_t using UT (rather than local time as "timelocal" does). # "timeoff" is like "timegm" except that it accepts a second (long) argument # that gives an offset to use when converting to a time_t. # "posix2time" and "time2posix" are described in an included manual page. # X3J11's work does not describe any of these functions. # These functions may well disappear in future releases of the time # conversion package. # # If you don't want functions that were inspired by NetBSD, add # -DNETBSD_INSPIRED=0 # to the end of the "CFLAGS=" line. Otherwise, the functions # "localtime_rz", "mktime_z", "tzalloc", and "tzfree" are added to the # time library, and if STD_INSPIRED is also defined the functions # "posix2time_z" and "time2posix_z" are added as well. # The functions ending in "_z" (or "_rz") are like their unsuffixed # (or suffixed-by-"_r") counterparts, except with an extra first # argument of opaque type timezone_t that specifies the timezone. # "tzalloc" allocates a timezone_t value, and "tzfree" frees it. # # If you want to allocate state structures in localtime, add # -DALL_STATE # to the end of the "CFLAGS=" line. Storage is obtained by calling malloc. # # NIST-PCTS:151-2, Version 1.4, (1993-12-03) is a test suite put # out by the National Institute of Standards and Technology # which claims to test C and Posix conformance. If you want to pass PCTS, add # -DPCTS # to the end of the "CFLAGS=" line. # # If you want strict compliance with XPG4 as of 1994-04-09, add # -DXPG4_1994_04_09 # to the end of the "CFLAGS=" line. This causes "strftime" to always return # 53 as a week number (rather than 52 or 53) for January days before # January's first Monday when a "%V" format is used and January 1 # falls on a Friday, Saturday, or Sunday. CFLAGS= # Linker flags. Default to $(LFLAGS) for backwards compatibility # to release 2012h and earlier. LDFLAGS= $(LFLAGS) # For leap seconds, this Makefile uses LEAPSECONDS='-L leapseconds' in # submake command lines. The default is no leap seconds. LEAPSECONDS= # The zic command and its arguments. zic= ./zic ZIC= $(zic) $(ZFLAGS) # To shrink the size of installed TZif files, # append "-r @N" to omit data before N-seconds-after-the-Epoch. # To grow the files and work around bugs in older applications, # possibly at the expense of introducing bugs in newer ones, # append "-b fat"; see ZIC_BLOAT_DEFAULT above. # See the zic man page for more about -b and -r. ZFLAGS= # How to use zic to install TZif files. ZIC_INSTALL= $(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS) # The name of a Posix-compliant 'awk' on your system. # mawk 1.3.3 and Solaris 10 /usr/bin/awk do not work. # Also, it is better (though not essential) if 'awk' supports UTF-8, # and unfortunately mawk and busybox awk do not support UTF-8. # Try AWK=gawk or AWK=nawk if your awk has the abovementioned problems. AWK= awk # The full path name of a Posix-compliant shell, preferably one that supports # the Korn shell's 'select' statement as an extension. # These days, Bash is the most popular. # It should be OK to set this to /bin/sh, on platforms where /bin/sh # lacks 'select' or doesn't completely conform to Posix, but /bin/bash # is typically nicer if it works. KSHELL= /bin/bash # Name of curl , used for HTML validation. CURL= curl # Name of GNU Privacy Guard , used to sign distributions. GPG= gpg # This expensive test requires USE_LTZ. # To suppress it, define this macro to be empty. CHECK_TIME_T_ALTERNATIVES = check_time_t_alternatives # SAFE_CHAR is a regular expression that matches a safe character. # Some parts of this distribution are limited to safe characters; # others can use any UTF-8 character. # For now, the safe characters are a safe subset of ASCII. # The caller must set the shell variable 'sharp' to the character '#', # since Makefile macros cannot contain '#'. # TAB_CHAR is a single tab character, in single quotes. TAB_CHAR= ' ' SAFE_CHARSET1= $(TAB_CHAR)' !\"'$$sharp'$$%&'\''()*+,./0123456789:;<=>?@' SAFE_CHARSET2= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\^_`' SAFE_CHARSET3= 'abcdefghijklmnopqrstuvwxyz{|}~' SAFE_CHARSET= $(SAFE_CHARSET1)$(SAFE_CHARSET2)$(SAFE_CHARSET3) SAFE_CHAR= '[]'$(SAFE_CHARSET)'-]' # These characters are Latin-1, and so are likely to be displayable # even in editors with limited character sets. UNUSUAL_OK_LATIN_1 = «°±»½¾× # This IPA symbol is represented in Unicode as the composition of # U+0075 and U+032F, and U+032F is not considered alphabetic by some # grep implementations that do not grok composition. UNUSUAL_OK_IPA = u̯ # Non-ASCII non-letters that OK_CHAR allows, as these characters are # useful in commentary. UNUSUAL_OK_CHARSET= $(UNUSUAL_OK_LATIN_1)$(UNUSUAL_OK_IPA) # Put this in a bracket expression to match spaces. s = [:space:] # OK_CHAR matches any character allowed in the distributed files. # This is the same as SAFE_CHAR, except that UNUSUAL_OK_CHARSET and # multibyte letters are also allowed so that commentary can contain a # few safe symbols and people's names and can quote non-English sources. # Other non-letters are limited to ASCII renderings for the # convenience of maintainers using XEmacs 21.5.34, which by default # mishandles Unicode characters U+0100 and greater. OK_CHAR= '[][:alpha:]$(UNUSUAL_OK_CHARSET)'$(SAFE_CHARSET)'-]' # SAFE_LINE matches a line of safe characters. # SAFE_SHARP_LINE is similar, except any OK character can follow '#'; # this is so that comments can contain non-ASCII characters. # OK_LINE matches a line of OK characters. SAFE_LINE= '^'$(SAFE_CHAR)'*$$' SAFE_SHARP_LINE='^'$(SAFE_CHAR)'*('$$sharp$(OK_CHAR)'*)?$$' OK_LINE= '^'$(OK_CHAR)'*$$' # Flags to give 'tar' when making a distribution. # Try to use flags appropriate for GNU tar. GNUTARFLAGS= --format=pax --pax-option='delete=atime,delete=ctime' \ --numeric-owner --owner=0 --group=0 \ --mode=go+u,go-w --sort=name TARFLAGS= `if tar $(GNUTARFLAGS) --version >/dev/null 2>&1; \ then echo $(GNUTARFLAGS); \ else :; \ fi` # Flags to give 'gzip' when making a distribution. GZIPFLAGS= -9n +# When comparing .tzs files, use GNU diff's -F'^TZ=' option if supported. +# This makes it easier to see which Zone has been affected. +DIFF_TZS= diff -u$$(! diff -u -F'^TZ=' - - <>/dev/null >&0 2>&1 \ + || echo ' -F^TZ=') + ############################################################################### #MAKE= make cc= cc CC= $(cc) -DTZDIR='"$(TZDIR)"' AR= ar # ':' on typical hosts; 'ranlib' on the ancient hosts that still need ranlib. RANLIB= : TZCOBJS= zic.o TZDOBJS= zdump.o localtime.o asctime.o strftime.o DATEOBJS= date.o localtime.o strftime.o asctime.o LIBSRCS= localtime.c asctime.c difftime.c strftime.c LIBOBJS= localtime.o asctime.o difftime.o strftime.o HEADERS= tzfile.h private.h NONLIBSRCS= zic.c zdump.c NEWUCBSRCS= date.c SOURCES= $(HEADERS) $(LIBSRCS) $(NONLIBSRCS) $(NEWUCBSRCS) \ tzselect.ksh workman.sh MANS= newctime.3 newstrftime.3 newtzset.3 time2posix.3 \ tzfile.5 tzselect.8 zic.8 zdump.8 MANTXTS= newctime.3.txt newstrftime.3.txt newtzset.3.txt \ time2posix.3.txt \ tzfile.5.txt tzselect.8.txt zic.8.txt zdump.8.txt \ date.1.txt COMMON= calendars CONTRIBUTING LICENSE Makefile \ NEWS README SECURITY theory.html version WEB_PAGES= tz-art.html tz-how-to.html tz-link.html CHECK_WEB_PAGES=check_theory.html check_tz-art.html \ check_tz-how-to.html check_tz-link.html DOCS= $(MANS) date.1 $(MANTXTS) $(WEB_PAGES) PRIMARY_YDATA= africa antarctica asia australasia \ europe northamerica southamerica YDATA= $(PRIMARY_YDATA) etcetera NDATA= factory TDATA_TO_CHECK= $(YDATA) $(NDATA) backward TDATA= $(YDATA) $(NDATA) $(BACKWARD) ZONETABLES= zone1970.tab zone.tab TABDATA= iso3166.tab $(TZDATA_TEXT) $(ZONETABLES) LEAP_DEPS= leapseconds.awk leap-seconds.list TZDATA_ZI_DEPS= ziguard.awk zishrink.awk version $(TDATA) \ $(PACKRATDATA) $(PACKRATLIST) DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA) $(PACKRATLIST) DATA= $(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \ leapseconds $(ZONETABLES) AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk \ ziguard.awk zishrink.awk MISC= $(AWK_SCRIPTS) TZS_YEAR= 2050 TZS_CUTOFF_FLAG= -c $(TZS_YEAR) TZS= to$(TZS_YEAR).tzs TZS_NEW= to$(TZS_YEAR)new.tzs TZS_DEPS= $(YDATA) asctime.c localtime.c \ private.h tzfile.h zdump.c zic.c TZDATA_DIST = $(COMMON) $(DATA) $(MISC) # EIGHT_YARDS is just a yard short of the whole ENCHILADA. EIGHT_YARDS = $(TZDATA_DIST) $(DOCS) $(SOURCES) tzdata.zi ENCHILADA = $(EIGHT_YARDS) $(TZS) # Consult these files when deciding whether to rebuild the 'version' file. # This list is not the same as the output of 'git ls-files', since # .gitignore is not distributed. VERSION_DEPS= \ calendars CONTRIBUTING LICENSE Makefile NEWS README SECURITY \ africa antarctica asctime.c asia australasia \ backward backzone \ checklinks.awk checktab.awk \ date.1 date.c difftime.c \ etcetera europe factory iso3166.tab \ leap-seconds.list leapseconds.awk localtime.c \ newctime.3 newstrftime.3 newtzset.3 northamerica \ private.h southamerica strftime.c theory.html \ time2posix.3 tz-art.html tz-how-to.html tz-link.html \ tzfile.5 tzfile.h tzselect.8 tzselect.ksh \ workman.sh zdump.8 zdump.c zic.8 zic.c \ ziguard.awk zishrink.awk \ zone.tab zone1970.tab # And for the benefit of csh users on systems that assume the user # shell should be used to handle commands in Makefiles. . . SHELL= /bin/sh all: tzselect zic zdump libtz.a $(TABDATA) \ vanguard.zi main.zi rearguard.zi ALL: all date $(ENCHILADA) install: all $(DATA) $(REDO) $(MANS) mkdir -p '$(DESTDIR)$(BINDIR)' \ '$(DESTDIR)$(ZDUMPDIR)' '$(DESTDIR)$(ZICDIR)' \ '$(DESTDIR)$(LIBDIR)' \ '$(DESTDIR)$(MANDIR)/man3' '$(DESTDIR)$(MANDIR)/man5' \ '$(DESTDIR)$(MANDIR)/man8' $(ZIC_INSTALL) -l $(LOCALTIME) \ `case '$(POSIXRULES)' in ?*) echo '-p';; esac \ ` $(POSIXRULES) \ -t '$(DESTDIR)$(TZDEFAULT)' cp -f $(TABDATA) '$(DESTDIR)$(TZDIR)/.' cp tzselect '$(DESTDIR)$(BINDIR)/.' cp zdump '$(DESTDIR)$(ZDUMPDIR)/.' cp zic '$(DESTDIR)$(ZICDIR)/.' cp libtz.a '$(DESTDIR)$(LIBDIR)/.' $(RANLIB) '$(DESTDIR)$(LIBDIR)/libtz.a' cp -f newctime.3 newtzset.3 '$(DESTDIR)$(MANDIR)/man3/.' cp -f tzfile.5 '$(DESTDIR)$(MANDIR)/man5/.' cp -f tzselect.8 zdump.8 zic.8 '$(DESTDIR)$(MANDIR)/man8/.' INSTALL: ALL install date.1 mkdir -p '$(DESTDIR)$(BINDIR)' '$(DESTDIR)$(MANDIR)/man1' cp date '$(DESTDIR)$(BINDIR)/.' cp -f date.1 '$(DESTDIR)$(MANDIR)/man1/.' # Calculate version number from git, if available. # Otherwise, use $(VERSION) unless it is "unknown" and there is already # a 'version' file, in which case reuse the existing 'version' contents # and append "-dirty" if the contents do not already end in "-dirty". version: $(VERSION_DEPS) { (type git) >/dev/null 2>&1 && \ V=`git describe --match '[0-9][0-9][0-9][0-9][a-z]*' \ --abbrev=7 --dirty` || \ if test '$(VERSION)' = unknown && V=`cat $@`; then \ case $$V in *-dirty);; *) V=$$V-dirty;; esac; \ else \ V='$(VERSION)'; \ fi; } && \ printf '%s\n' "$$V" >$@.out mv $@.out $@ # These files can be tailored by setting BACKWARD, PACKRATDATA, PACKRATLIST. vanguard.zi main.zi rearguard.zi: $(DSTDATA_ZI_DEPS) $(AWK) \ -v DATAFORM=`expr $@ : '\(.*\).zi'` \ -v PACKRATDATA='$(PACKRATDATA)' \ -v PACKRATLIST='$(PACKRATLIST)' \ -f ziguard.awk \ $(TDATA) $(PACKRATDATA) >$@.out mv $@.out $@ # This file has a version comment that attempts to capture any tailoring # via BACKWARD, DATAFORM, PACKRATDATA, PACKRATLIST, and REDO. tzdata.zi: $(DATAFORM).zi version zishrink.awk version=`sed 1q version` && \ LC_ALL=C $(AWK) \ -v dataform='$(DATAFORM)' \ -v deps='$(DSTDATA_ZI_DEPS) zishrink.awk' \ -v redo='$(REDO)' \ -v version="$$version" \ -f zishrink.awk \ $(DATAFORM).zi >$@.out mv $@.out $@ version.h: version VERSION=`cat version` && printf '%s\n' \ 'static char const PKGVERSION[]="($(PACKAGE)) ";' \ "static char const TZVERSION[]=\"$$VERSION\";" \ 'static char const REPORT_BUGS_TO[]="$(BUGEMAIL)";' \ >$@.out mv $@.out $@ zdump: $(TZDOBJS) $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZDOBJS) $(LDLIBS) zic: $(TZCOBJS) $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZCOBJS) $(LDLIBS) leapseconds: $(LEAP_DEPS) $(AWK) -v EXPIRES_LINE=$(EXPIRES_LINE) \ -f leapseconds.awk leap-seconds.list >$@.out mv $@.out $@ # Arguments to pass to submakes of install_data. # They can be overridden by later submake arguments. INSTALLARGS = \ BACKWARD='$(BACKWARD)' \ DESTDIR='$(DESTDIR)' \ LEAPSECONDS='$(LEAPSECONDS)' \ PACKRATDATA='$(PACKRATDATA)' \ PACKRATLIST='$(PACKRATLIST)' \ TZDEFAULT='$(TZDEFAULT)' \ TZDIR='$(TZDIR)' \ ZIC='$(ZIC)' INSTALL_DATA_DEPS = zic leapseconds tzdata.zi # 'make install_data' installs one set of TZif files. install_data: $(INSTALL_DATA_DEPS) $(ZIC_INSTALL) tzdata.zi posix_only: $(INSTALL_DATA_DEPS) $(MAKE) $(INSTALLARGS) LEAPSECONDS= install_data right_only: $(INSTALL_DATA_DEPS) $(MAKE) $(INSTALLARGS) LEAPSECONDS='-L leapseconds' \ install_data # In earlier versions of this makefile, the other two directories were # subdirectories of $(TZDIR). However, this led to configuration errors. # For example, with posix_right under the earlier scheme, # TZ='right/Australia/Adelaide' got you localtime with leap seconds, # but gmtime without leap seconds, which led to problems with applications # like sendmail that subtract gmtime from localtime. # Therefore, the other two directories are now siblings of $(TZDIR). # You must replace all of $(TZDIR) to switch from not using leap seconds # to using them, or vice versa. right_posix: right_only rm -fr '$(DESTDIR)$(TZDIR)-leaps' ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-leaps' || \ $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only posix_right: posix_only rm -fr '$(DESTDIR)$(TZDIR)-posix' ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-posix' || \ $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only $(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only zones: $(REDO) # dummy.zd is not a real file; it is mentioned here only so that the # top-level 'make' does not have a syntax error. ZDS = dummy.zd # Rule used only by submakes invoked by the $(TZS_NEW) rule. # It is separate so that GNU 'make -j' can run instances in parallel. $(ZDS): zdump ./zdump -i $(TZS_CUTOFF_FLAG) '$(wd)/'$$(expr $@ : '\(.*\).zd') \ >$@ TZS_NEW_DEPS = tzdata.zi zdump zic $(TZS_NEW): $(TZS_NEW_DEPS) rm -fr tzs$(TZS_YEAR).dir mkdir tzs$(TZS_YEAR).dir $(zic) -d tzs$(TZS_YEAR).dir tzdata.zi $(AWK) '/^L/{print "Link\t" $$2 "\t" $$3}' \ tzdata.zi | LC_ALL=C sort >$@.out wd=`pwd` && \ x=`$(AWK) '/^Z/{print "tzs$(TZS_YEAR).dir/" $$2 ".zd"}' \ tzdata.zi \ | LC_ALL=C sort -t . -k 2,2` && \ set x $$x && \ shift && \ ZDS=$$* && \ $(MAKE) wd="$$wd" TZS_CUTOFF_FLAG="$(TZS_CUTOFF_FLAG)" \ ZDS="$$ZDS" $$ZDS && \ sed 's,^TZ=".*\.dir/,TZ=",' $$ZDS >>$@.out rm -fr tzs$(TZS_YEAR).dir mv $@.out $@ # If $(TZS) exists but 'make check_tzs' fails, a maintainer should inspect the # failed output and fix the inconsistency, perhaps by running 'make force_tzs'. $(TZS): touch $@ force_tzs: $(TZS_NEW) cp $(TZS_NEW) $(TZS) libtz.a: $(LIBOBJS) rm -f $@ $(AR) -rc $@ $(LIBOBJS) $(RANLIB) $@ date: $(DATEOBJS) $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(DATEOBJS) $(LDLIBS) tzselect: tzselect.ksh version VERSION=`cat version` && sed \ -e 's|#!/bin/bash|#!$(KSHELL)|g' \ -e 's|AWK=[^}]*|AWK='\''$(AWK)'\''|g' \ -e 's|\(PKGVERSION\)=.*|\1='\''($(PACKAGE)) '\''|' \ -e 's|\(REPORT_BUGS_TO\)=.*|\1=$(BUGEMAIL)|' \ -e 's|TZDIR=[^}]*|TZDIR=$(TZDIR)|' \ -e 's|\(TZVERSION\)=.*|\1='"$$VERSION"'|' \ <$@.ksh >$@.out chmod +x $@.out mv $@.out $@ -check: check_character_set check_white_space check_links \ +check: check_back check_mild +check_mild: check_character_set check_white_space check_links \ check_name_lengths check_slashed_abbrs check_sorted \ check_tables check_web check_ziguard check_zishrink check_tzs check_character_set: $(ENCHILADA) test ! '$(UTF8_LOCALE)' || \ ! printf 'A\304\200B\n' | \ LC_ALL='$(UTF8_LOCALE)' grep -q '^A.B$$' >/dev/null 2>&1 || { \ LC_ALL='$(UTF8_LOCALE)' && export LC_ALL && \ sharp='#' && \ ! grep -Env $(SAFE_LINE) $(MANS) date.1 $(MANTXTS) \ $(MISC) $(SOURCES) $(WEB_PAGES) \ CONTRIBUTING LICENSE README SECURITY \ version tzdata.zi && \ ! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_'$(OK_CHAR)'*$$' \ Makefile && \ ! grep -Env $(SAFE_SHARP_LINE) $(TDATA_TO_CHECK) backzone \ leapseconds zone.tab && \ ! grep -Env $(OK_LINE) $(ENCHILADA); \ } touch $@ check_white_space: $(ENCHILADA) patfmt=' \t|[\f\r\v]' && pat=`printf "$$patfmt\\n"` && \ ! grep -En "$$pat" \ $$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list) ! grep -n '[$s]$$' \ $$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list) touch $@ PRECEDES_FILE_NAME = ^(Zone|Link[$s]+[^$s]+)[$s]+ FILE_NAME_COMPONENT_TOO_LONG = $(PRECEDES_FILE_NAME)[^$s]*[^/$s]{15} check_name_lengths: $(TDATA_TO_CHECK) backzone ! grep -En '$(FILE_NAME_COMPONENT_TOO_LONG)' \ $(TDATA_TO_CHECK) backzone touch $@ PRECEDES_STDOFF = ^(Zone[$s]+[^$s]+)?[$s]+ STDOFF = [-+]?[0-9:.]+ RULELESS_SAVE = (-|$(STDOFF)[sd]?) RULELESS_SLASHED_ABBRS = \ $(PRECEDES_STDOFF)$(STDOFF)[$s]+$(RULELESS_SAVE)[$s]+[^$s]*/ check_slashed_abbrs: $(TDATA_TO_CHECK) ! grep -En '$(RULELESS_SLASHED_ABBRS)' $(TDATA_TO_CHECK) touch $@ CHECK_CC_LIST = { n = split($$1,a,/,/); for (i=2; i<=n; i++) print a[1], a[i]; } check_sorted: backward backzone iso3166.tab zone.tab zone1970.tab - $(AWK) '/^Link/ {printf "%.5d %s\n", g, $$3} /^$$/ {g++}' \ + $(AWK) '/^Link/ {printf "%.5d %s\n", g, $$3} !/./ {g++}' \ backward | LC_ALL=C sort -cu $(AWK) '/^Zone/ {print $$2}' backzone | LC_ALL=C sort -cu touch $@ -check_links: checklinks.awk $(TDATA_TO_CHECK) tzdata.zi +check_back: checklinks.awk $(TDATA_TO_CHECK) $(AWK) \ -v DATAFORM=$(DATAFORM) \ -v backcheck=backward \ -f checklinks.awk $(TDATA_TO_CHECK) + touch $@ + +check_links: checklinks.awk tzdata.zi $(AWK) \ -v DATAFORM=$(DATAFORM) \ -f checklinks.awk tzdata.zi touch $@ check_tables: checktab.awk $(YDATA) backward $(ZONETABLES) for tab in $(ZONETABLES); do \ test "$$tab" = zone.tab && links='$(BACKWARD)' || links=''; \ $(AWK) -f checktab.awk -v zone_table=$$tab $(YDATA) $$links \ || exit; \ done touch $@ check_tzs: $(TZS) $(TZS_NEW) if test -s $(TZS); then \ - diff -u $(TZS) $(TZS_NEW); \ + $(DIFF_TZS) $(TZS) $(TZS_NEW); \ else \ cp $(TZS_NEW) $(TZS); \ fi touch $@ check_web: $(CHECK_WEB_PAGES) check_theory.html: theory.html check_tz-art.html: tz-art.html check_tz-how-to.html: tz-how-to.html check_tz-link.html: tz-link.html check_theory.html check_tz-art.html check_tz-how-to.html check_tz-link.html: $(CURL) -sS --url https://validator.w3.org/nu/ -F out=gnu \ -F file=@$$(expr $@ : 'check_\(.*\)') -o $@.out && \ test ! -s $@.out || { cat $@.out; exit 1; } mv $@.out $@ check_ziguard: rearguard.zi vanguard.zi ziguard.awk $(AWK) -v DATAFORM=rearguard -f ziguard.awk vanguard.zi | \ diff -u rearguard.zi - $(AWK) -v DATAFORM=vanguard -f ziguard.awk rearguard.zi | \ diff -u vanguard.zi - touch $@ # Check that zishrink.awk does not alter the data, and that ziguard.awk # preserves main-format data. check_zishrink: check_zishrink_posix check_zishrink_right check_zishrink_posix check_zishrink_right: \ zic leapseconds $(PACKRATDATA) $(PACKRATLIST) \ $(TDATA) $(DATAFORM).zi tzdata.zi rm -fr $@.dir $@-t.dir $@-shrunk.dir mkdir $@.dir $@-t.dir $@-shrunk.dir case $@ in \ *_right) leap='-L leapseconds';; \ *) leap=;; \ esac && \ $(ZIC) $$leap -d $@.dir $(DATAFORM).zi && \ $(ZIC) $$leap -d $@-shrunk.dir tzdata.zi && \ case $(DATAFORM),$(PACKRATLIST) in \ main,) \ $(ZIC) $$leap -d $@-t.dir $(TDATA) && \ $(AWK) '/^Rule/' $(TDATA) | \ $(ZIC) $$leap -d $@-t.dir - $(PACKRATDATA) && \ diff -r $@.dir $@-t.dir;; \ esac diff -r $@.dir $@-shrunk.dir rm -fr $@.dir $@-t.dir $@-shrunk.dir touch $@ clean_misc: rm -fr check_*.dir rm -f *.o *.out $(TIME_T_ALTERNATIVES) \ check_* core typecheck_* \ date tzselect version.h zdump zic libtz.a clean: clean_misc rm -fr *.dir tzdb-*/ rm -f *.zi $(TZS_NEW) maintainer-clean: clean @echo 'This command is intended for maintainers to use; it' @echo 'deletes files that may need special tools to rebuild.' rm -f leapseconds version $(MANTXTS) $(TZS) *.asc *.tar.* names: @echo $(ENCHILADA) public: check check_public $(CHECK_TIME_T_ALTERNATIVES) \ tarballs signatures date.1.txt: date.1 newctime.3.txt: newctime.3 newstrftime.3.txt: newstrftime.3 newtzset.3.txt: newtzset.3 time2posix.3.txt: time2posix.3 tzfile.5.txt: tzfile.5 tzselect.8.txt: tzselect.8 zdump.8.txt: zdump.8 zic.8.txt: zic.8 $(MANTXTS): workman.sh LC_ALL=C sh workman.sh `expr $@ : '\(.*\)\.txt$$'` >$@.out mv $@.out $@ # Set file timestamps deterministically if possible, # so that tarballs containing the timestamps are reproducible. # # '$(SET_TIMESTAMP_N) N DEST A B C ...' sets the timestamp of the # file DEST to the maximum of the timestamps of the files A B C ..., # plus N if GNU ls and touch are available. SET_TIMESTAMP_N = sh -c '\ n=$$0 dest=$$1; shift; \ touch -cmr `ls -t "$$@" | sed 1q` "$$dest" && \ if test $$n != 0 && \ lsout=`ls -n --time-style="+%s" "$$dest" 2>/dev/null`; then \ set x $$lsout && \ touch -cmd @`expr $$7 + $$n` "$$dest"; \ else :; fi' # If DEST depends on A B C ... in this Makefile, callers should use # $(SET_TIMESTAMP_DEP) DEST A B C ..., for the benefit of any # downstream 'make' that considers equal timestamps to be out of date. # POSIX allows this 'make' behavior, and HP-UX 'make' does it. # If all that matters is that the timestamp be reproducible # and plausible, use $(SET_TIMESTAMP). SET_TIMESTAMP = $(SET_TIMESTAMP_N) 0 SET_TIMESTAMP_DEP = $(SET_TIMESTAMP_N) 1 # Set the timestamps to those of the git repository, if available, # and if the files have not changed since then. # This uses GNU 'ls --time-style=+%s', which outputs the seconds count, # and GNU 'touch -d@N FILE', where N is the number of seconds since 1970. # If git or GNU is absent, don't bother to sync with git timestamps. # Also, set the timestamp of each prebuilt file like 'leapseconds' # to be the maximum of the files it depends on. set-timestamps.out: $(EIGHT_YARDS) rm -f $@ if (type git) >/dev/null 2>&1 && \ files=`git ls-files $(EIGHT_YARDS)` && \ touch -md @1 test.out; then \ rm -f test.out && \ for file in $$files; do \ if git diff --quiet $$file; then \ time=`git log -1 --format='tformat:%ct' $$file` && \ touch -cmd @$$time $$file; \ else \ echo >&2 "$$file: warning: does not match repository"; \ fi || exit; \ done; \ fi $(SET_TIMESTAMP_DEP) leapseconds $(LEAP_DEPS) for file in `ls $(MANTXTS) | sed 's/\.txt$$//'`; do \ $(SET_TIMESTAMP_DEP) $$file.txt $$file workman.sh || \ exit; \ done $(SET_TIMESTAMP_DEP) version $(VERSION_DEPS) $(SET_TIMESTAMP_DEP) tzdata.zi $(TZDATA_ZI_DEPS) touch $@ set-tzs-timestamp.out: $(TZS) $(SET_TIMESTAMP_DEP) $(TZS) $(TZS_DEPS) touch $@ # The zics below ensure that each data file can stand on its own. # We also do an all-files run to catch links to links. check_public: $(VERSION_DEPS) rm -fr public.dir mkdir public.dir ln $(VERSION_DEPS) public.dir cd public.dir && $(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' ALL for i in $(TDATA_TO_CHECK) public.dir/tzdata.zi \ public.dir/vanguard.zi public.dir/main.zi \ public.dir/rearguard.zi; \ do \ public.dir/zic -v -d public.dir/zoneinfo $$i 2>&1 || exit; \ done public.dir/zic -v -d public.dir/zoneinfo-all $(TDATA_TO_CHECK) : : Also check 'backzone' syntax. rm public.dir/main.zi cd public.dir && $(MAKE) PACKRATDATA=backzone main.zi public.dir/zic -d public.dir/zoneinfo main.zi rm public.dir/main.zi cd public.dir && \ $(MAKE) PACKRATDATA=backzone PACKRATLIST=zone.tab main.zi public.dir/zic -d public.dir/zoneinfo main.zi : rm -fr public.dir touch $@ # Check that the code works under various alternative # implementations of time_t. check_time_t_alternatives: $(TIME_T_ALTERNATIVES) $(TIME_T_ALTERNATIVES_TAIL): $(TIME_T_ALTERNATIVES_HEAD) $(TIME_T_ALTERNATIVES): $(VERSION_DEPS) rm -fr $@.dir mkdir $@.dir ln $(VERSION_DEPS) $@.dir case $@ in \ int*32_t) range=-2147483648,2147483648;; \ u*) range=0,4294967296;; \ *) range=-4294967296,4294967296;; \ esac && \ wd=`pwd` && \ zones=`$(AWK) '/^[^#]/ { print $$3 }' /dev/null; then \ quiet_option='-q'; \ else \ quiet_option=''; \ fi && \ diff $$quiet_option -r $(TIME_T_ALTERNATIVES_HEAD).dir/etc \ $@.dir/etc && \ diff $$quiet_option -r \ $(TIME_T_ALTERNATIVES_HEAD).dir/usr/share \ $@.dir/usr/share; \ } touch $@ TRADITIONAL_ASC = \ tzcode$(VERSION).tar.gz.asc \ tzdata$(VERSION).tar.gz.asc REARGUARD_ASC = \ tzdata$(VERSION)-rearguard.tar.gz.asc ALL_ASC = $(TRADITIONAL_ASC) $(REARGUARD_ASC) \ tzdb-$(VERSION).tar.lz.asc tarballs rearguard_tarballs tailored_tarballs traditional_tarballs \ signatures rearguard_signatures traditional_signatures: \ version set-timestamps.out rearguard.zi vanguard.zi VERSION=`cat version` && \ $(MAKE) AWK='$(AWK)' VERSION="$$VERSION" $@_version # These *_version rules are intended for use if VERSION is set by some # other means. Ordinarily these rules are used only by the above # non-_version rules, which set VERSION on the 'make' command line. tarballs_version: traditional_tarballs_version rearguard_tarballs_version \ tzdb-$(VERSION).tar.lz rearguard_tarballs_version: \ tzdata$(VERSION)-rearguard.tar.gz traditional_tarballs_version: \ tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz tailored_tarballs_version: \ tzdata$(VERSION)-tailored.tar.gz signatures_version: $(ALL_ASC) rearguard_signatures_version: $(REARGUARD_ASC) traditional_signatures_version: $(TRADITIONAL_ASC) tzcode$(VERSION).tar.gz: set-timestamps.out LC_ALL=C && export LC_ALL && \ tar $(TARFLAGS) -cf - \ $(COMMON) $(DOCS) $(SOURCES) | \ gzip $(GZIPFLAGS) >$@.out mv $@.out $@ tzdata$(VERSION).tar.gz: set-timestamps.out LC_ALL=C && export LC_ALL && \ tar $(TARFLAGS) -cf - $(TZDATA_DIST) | \ gzip $(GZIPFLAGS) >$@.out mv $@.out $@ # Create empty files with a reproducible timestamp. CREATE_EMPTY = TZ=UTC0 touch -mt 202010122253.00 # The obsolescent *rearguard* targets and related macros are present # for backwards compatibility with tz releases 2018e through 2022a. # They should go away eventually. To build rearguard tarballs you # can instead use 'make DATAFORM=rearguard tailored_tarballs'. tzdata$(VERSION)-rearguard.tar.gz: rearguard.zi set-timestamps.out rm -fr $@.dir mkdir $@.dir ln $(TZDATA_DIST) $@.dir cd $@.dir && rm -f $(TDATA) $(PACKRATDATA) version for f in $(TDATA) $(PACKRATDATA); do \ rearf=$@.dir/$$f; \ $(AWK) -v DATAFORM=rearguard -f ziguard.awk $$f >$$rearf && \ $(SET_TIMESTAMP_DEP) $$rearf ziguard.awk $$f || exit; \ done sed '1s/$$/-rearguard/' $@.dir/version : The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier. $(CREATE_EMPTY) $@.dir/pacificnew touch -cmr version $@.dir/version LC_ALL=C && export LC_ALL && \ (cd $@.dir && \ tar $(TARFLAGS) -cf - \ $(TZDATA_DIST) pacificnew | \ gzip $(GZIPFLAGS)) >$@.out mv $@.out $@ # Create a tailored tarball suitable for TZUpdater and compatible tools. # For example, 'make DATAFORM=vanguard tailored_tarballs' makes a tarball # useful for testing whether TZUpdater supports vanguard form. # The generated tarball is not byte-for-byte equivalent to a hand-tailored # traditional tarball, as data entries are put into 'etcetera' even if they # came from some other source file. However, the effect should be the same # for ordinary use, which reads all the source files. tzdata$(VERSION)-tailored.tar.gz: set-timestamps.out rm -fr $@.dir mkdir $@.dir : The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier. cd $@.dir && \ $(CREATE_EMPTY) $(PRIMARY_YDATA) $(NDATA) backward \ `test $(DATAFORM) = vanguard || echo pacificnew` (grep '^#' tzdata.zi && echo && cat $(DATAFORM).zi) \ >$@.dir/etcetera touch -cmr tzdata.zi $@.dir/etcetera sed -n \ -e '/^# *version *\(.*\)/h' \ -e '/^# *ddeps */H' \ -e '$$!d' \ -e 'g' \ -e 's/^# *version *//' \ -e 's/\n# *ddeps */-/' \ -e 's/ /-/g' \ -e 'p' \ $@.dir/version touch -cmr version $@.dir/version links= && \ for file in $(TZDATA_DIST); do \ test -f $@.dir/$$file || links="$$links $$file"; \ done && \ ln $$links $@.dir LC_ALL=C && export LC_ALL && \ (cd $@.dir && \ tar $(TARFLAGS) -cf - * | gzip $(GZIPFLAGS)) >$@.out mv $@.out $@ tzdb-$(VERSION).tar.lz: set-timestamps.out set-tzs-timestamp.out rm -fr tzdb-$(VERSION) mkdir tzdb-$(VERSION) ln $(ENCHILADA) tzdb-$(VERSION) $(SET_TIMESTAMP) tzdb-$(VERSION) tzdb-$(VERSION)/* LC_ALL=C && export LC_ALL && \ tar $(TARFLAGS) -cf - tzdb-$(VERSION) | lzip -9 >$@.out mv $@.out $@ tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz.asc: tzdata$(VERSION).tar.gz tzdata$(VERSION)-rearguard.tar.gz.asc: tzdata$(VERSION)-rearguard.tar.gz tzdb-$(VERSION).tar.lz.asc: tzdb-$(VERSION).tar.lz $(ALL_ASC): $(GPG) --armor --detach-sign $? TYPECHECK_CFLAGS = $(CFLAGS) -DTYPECHECK -D__time_t_defined -D_TIME_T typecheck: typecheck_long_long typecheck_unsigned typecheck_long_long typecheck_unsigned: $(VERSION_DEPS) rm -fr $@.dir mkdir $@.dir ln $(VERSION_DEPS) $@.dir cd $@.dir && \ case $@ in \ *_long_long) i="long long";; \ *_unsigned ) i="unsigned" ;; \ esac && \ typecheck_cflags='' && \ $(MAKE) \ CFLAGS="$(TYPECHECK_CFLAGS) \"-Dtime_t=$$i\"" \ TOPDIR="`pwd`" \ install $@.dir/zdump -i -c 1970,1971 Europe/Rome touch $@ zonenames: tzdata.zi @$(AWK) '/^Z/ { print $$2 } /^L/ { print $$3 }' tzdata.zi asctime.o: private.h tzfile.h date.o: private.h difftime.o: private.h localtime.o: private.h tzfile.h strftime.o: private.h tzfile.h zdump.o: version.h zic.o: private.h tzfile.h version.h .PHONY: ALL INSTALL all -.PHONY: check check_time_t_alternatives +.PHONY: check check_mild check_time_t_alternatives .PHONY: check_web check_zishrink .PHONY: clean clean_misc dummy.zd force_tzs .PHONY: install install_data maintainer-clean names .PHONY: posix_only posix_right public .PHONY: rearguard_signatures rearguard_signatures_version .PHONY: rearguard_tarballs rearguard_tarballs_version .PHONY: right_only right_posix signatures signatures_version .PHONY: tarballs tarballs_version .PHONY: traditional_signatures traditional_signatures_version .PHONY: traditional_tarballs traditional_tarballs_version .PHONY: tailored_tarballs tailored_tarballs_version .PHONY: typecheck .PHONY: zonenames zones .PHONY: $(ZDS) diff --git a/NEWS b/NEWS index 086151073a3b..701e490e4834 100644 --- a/NEWS +++ b/NEWS @@ -1,5815 +1,5902 @@ News for the tz database +Release 2022g - 2022-11-29 08:58:31 -0800 + + Briefly: + The northern edge of Chihuahua changes to US timekeeping. + Much of Greenland stops changing clocks after March 2023. + Fix some pre-1996 timestamps in northern Canada. + C89 is now deprecated; please use C99 or later. + Portability fixes for AIX, libintl, MS-Windows, musl, z/OS + In C code, use more C23 features if available. + C23 timegm now supported by default + Fixes for unlikely integer overflows + + Changes to future timestamps + + In the Mexican state of Chihuahua, the border strip near the US + will change to agree with nearby US locations on 2022-11-30. + The strip's western part, represented by Ciudad Juárez, switches + from -06 all year to -07/-06 with US DST rules, like El Paso, TX. + The eastern part, represented by Ojinaga, will observe US DST next + year, like Presidio, TX. (Thanks to Heitor David Pinto.) + A new Zone America/Ciudad_Juarez splits from America/Ojinaga. + + Much of Greenland, represented by America/Nuuk, stops observing + winter time after March 2023, so its daylight saving time becomes + standard time. (Thanks to Jonas Nyrup and Jürgen Appel.) + + Changes to past timestamps + + Changes for pre-1996 northern Canada (thanks to Chris Walton): + + Merge America/Iqaluit and America/Pangnirtung into the former, + with a backward compatibility link for the latter name. + There is no good evidence the two locations differ since 1970. + This change affects pre-1996 America/Pangnirtung timestamps. + + Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and + Yellowknife did not observe DST in 1965, and did observe DST + from 1972 through 1979. + + Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. + + Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. + (Thanks to Alois Treindl.) + + Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), + not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) + + Changes to code + + Although tzcode still works with C89, bugs found in recent routine + maintenance indicate that bitrot has set in and that in practice + C89 is no longer used to build tzcode. As it is a maintenance + burden, support for C89 is planned to be removed soon. Instead, + please use compilers compatible with C99, C11, C17, or C23. + + timegm, which tzcode implemented in 1989, will finally be + standardized 34 years later as part of C23, so timegm is now + supported even if STD_INSPIRED is not defined. + + Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. + (Problem reported by Đoàn Trần Công Danh.) + + Fix bug in zic on hosts where malloc(0) yields NULL on success. + (Problem reported by Tim McBrayer for AIX 6.1.) + + Fix zic configuration to avoid linkage failures on some platforms. + (Problems reported by Gilmore Davidson and Igor Ivanov.) + + Work around MS-Windows nmake incompatibility with POSIX. + (Problem reported by Manuela Friedrich.) + + Port mktime and strftime to debugging platforms where accessing + uninitialized data has undefined behavior (strftime problem + reported by Robert Elz). + + Check more carefully for unlikely integer overflows, preferring + C23 to overflow checking by hand, as the latter has + had obscure bugs. + + Changes to build procedure + + New Makefile rule check_mild that skips checking whether Link + lines are in the file 'backward'. (Inspired by a suggestion from + Stephen Colebourne.) + + Release 2022f - 2022-10-28 18:04:57 -0700 Briefly: Mexico will no longer observe DST except near the US border. Chihuahua moves to year-round -06 on 2022-10-30. Fiji no longer observes DST. Move links to 'backward'. In vanguard form, GMT is now a Zone and Etc/GMT a link. zic now supports links to links, and vanguard form uses this. Simplify four Ontario zones. Fix a Y2438 bug when reading TZif data. Enable 64-bit time_t on 32-bit glibc platforms. Omit large-file support when no longer needed. In C code, use some C23 features if available. Remove no-longer-needed workaround for Qt bug 53071. - Changes to future timestamps. + Changes to future timestamps Mexico will no longer observe DST after 2022, except for areas near the US border that continue to observe US DST rules. On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves from -07 (-06 with DST) to year-round -06, thus not changing its clocks that day. The new law states that Chihuahua near the US border no longer observes US DST. + (Thanks to gera for the heads-up about Chihuahua.) Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) For now, assume DST is suspended indefinitely. Changes to data Move links to 'backward' to ease and simplify link maintenance. This affects generated data only if you use 'make BACKWARD='. GMT is now a Zone and Etc/GMT a link instead of vice versa, as GMT is needed for leap second support whereas Etc/GMT is not. However, this change exposes a bug in TZUpdater 2.3.2 so it is present only in vanguard form for now. Vanguard form now uses links to links, as zic now supports this. Changes to past timestamps Simplify four Ontario zones, as most of the post-1970 differences seem to have been imaginary. (Problem reported by Chris Walton.) Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay to 'backzone'; backward-compatibility links still work, albeit with some different timestamps before November 2005. Changes to code zic now supports links to links regardless of input line order. For example, if Australia/Sydney is a Zone, the lines Link Australia/Canberra Australia/ACT Link Australia/Sydney Australia/Canberra now work correctly, even though the shell commands ln Australia/Canberra Australia/ACT ln Australia/Sydney Australia/Canberra would fail because the first command attempts to use a link Australia/Canberra that does not exist until after the second command is executed. Previously, zic had unspecified behavior if a Link line's target was another link, and zic often misbehaved if a Link line's target was a later Link line. Fix line number in zic's diagnostic for a link to a link. Fix a bug that caused localtime to mishandle timestamps starting in the year 2438 when reading data generated by 'zic -b fat' when distant-future DST transitions occur at times given in standard time or in UT, not the usual case of local time. This occurs when the corresponding .zi Rule lines specify DST transitions with TO columns of 'max' and AT columns that end in 's' or 'u'. The number 2438 comes from the 32-bit limit in the year 2038, plus the 400-year Gregorian cycle. (Problem reported by Bradley White.) On glibc 2.34 and later, which optionally supports 64-bit time_t on platforms like x86 where time_t was traditionally 32 bits, default time_t to 64 instead of 32 bits. This lets functions like localtime support timestamps after the year 2038, and fixes year-2038 problems in zic when accessing files dated after 2038. To continue to limit time_t to 32 bits on these platforms, use "make CFLAGS='-D_TIME_BITS=32'". In C code, do not enable large-file support on platforms like AIX and macOS that no longer need it now that tzcode does not use off_t or related functions like 'stat'. Large-file support is still enabled by default on GNU/Linux, as it is needed for 64-bit time_t support. In C code, prefer C23 keywords to pre-C23 macros for alignof, bool, false, and true. Also, use the following C23 features if available: __has_include, unreachable. zic no longer works around Qt bug 53071, as the relevant Qt releases have been out of support since 2019. This change affects only fat TZif files, as thin files never had the workaround. zdump no longer modifies the environ vector when compiled on platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. This avoid undefined behavior on POSIX platforms. Release 2022e - 2022-10-11 11:13:02 -0700 Briefly: Jordan and Syria switch from +02/+03 with DST to year-round +03. Changes to future timestamps Jordan and Syria are abandoning the DST regime and are changing to permanent +03, so they will not fall back from +03 to +02 on 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) Changes to past timestamps On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. Changes to past time zone abbreviations and DST flags The temporary advancement of clocks in central Mexico in summer 1931 is now treated as daylight saving time, instead of as two changes to standard time. Release 2022d - 2022-09-23 12:02:57 -0700 Briefly: Palestine transitions are now Saturdays at 02:00. Simplify three Ukraine zones into one. Changes to future timestamps Palestine now springs forward and falls back at 02:00 on the first Saturday on or after March 24 and October 24, respectively. This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. (Thanks to Heba Hamad.) Changes to past timestamps Simplify three Ukraine zones to one, since the post-1970 differences seem to have been imaginary. Move Europe/Uzhgorod and Europe/Zaporozhye to 'backzone'; backward-compatibility links still work, albeit with different timestamps before October 1991. Release 2022c - 2022-08-15 17:47:18 -0700 Briefly: Work around awk bug in FreeBSD, macOS, etc. Improve tzselect on intercontinental Zones. Changes to code Work around a bug in onetrueawk that broke commands like 'make traditional_tarballs' on FreeBSD, macOS, etc. (Problem reported by Deborah Goldsmith.) Add code to tzselect that uses experimental structured comments in zone1970.tab to clarify whether Zones like Africa/Abidjan and Europe/Istanbul cross continent or ocean boundaries. (Inspired by a problem reported by Peter Krefting.) Fix bug with 'zic -d /a/b/c' when /a is unwritable but the directory /a/b already exists. Remove zoneinfo2tdf.pl, as it was unused and triggered false malware alarms on some email servers. Release 2022b - 2022-08-10 15:38:32 -0700 Briefly: Chile's DST is delayed by a week in September 2022. Iran no longer observes DST after 2022. Rename Europe/Kiev to Europe/Kyiv. New zic -R option Vanguard form now uses %z. Finish moving duplicate-since-1970 zones to 'backzone'. New build option PACKRATLIST New tailored_tarballs target, replacing rearguard_tarballs Changes to future timestamps Chile's 2022 DST start is delayed from September 4 to September 11. (Thanks to Juan Correa.) Iran plans to stop observing DST permanently, after it falls back on 2022-09-21. (Thanks to Ali Mirjamali.) Changes to past timestamps Finish moving to 'backzone' the location-based zones whose timestamps since 1970 are duplicates; adjust links accordingly. This change ordinarily affects only pre-1970 timestamps, and with the new PACKRATLIST option it does not affect any timestamps. In this round the affected zones are Antarctica/Vostok, Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, Pacific/Wake and Pacific/Wallis, and the affected links are Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, Pacific/Truk, and Pacific/Yap. From fall 1994 through fall 1995, Shanks wrote that Crimea's DST transitions were at 02:00 standard time, not at 00:00. (Thanks to Michael Deckers.) Iran adopted standard time in 1935, not 1946. In 1977 it observed DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 transition was on 05-27, not 03-21. (Thanks to Roozbeh Pournader and Francis Santoni.) Chile's observance of -04 from 1946-08-29 through 1947-03-31 was considered DST, not standard time. Santiago and environs had moved their clocks back to rejoin the rest of mainland Chile; put this change at the end of 1946-08-28. (Thanks to Michael Deckers.) Some old, small clock transitions have been removed, as people at the time did not change their clocks. This affects Asia/Hong_Kong in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. Changes to zone name Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in English now. Spelling of other names in Ukraine has not yet demonstrably changed in common English practice so for now these names retain old spellings, as in other countries (e.g., Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). Changes to code zic has a new option '-R @N' to output explicit transitions < N. (Need suggested by Almaz Mingaleev.) 'zic -r @N' no longer outputs bad data when N < first transition. (Problem introduced in 2021d and reported by Peter Krefting.) zic now checks its input for NUL bytes and unterminated lines, and now supports input line lengths up to 2048 (not 512) bytes. gmtime and related code now use the abbreviation "UTC" not "GMT". POSIX is being revised to require this. When tzset and related functions set vestigial static variables like tzname, they now prefer specified timestamps to unspecified ones. (Problem reported by Almaz Mingaleev.) zic no longer complains "can't determine time zone abbreviation to use just after until time" when a transition to a new standard time occurs simultaneously with the first DST fallback transition. Changes to build procedure Source data in vanguard form now uses the %z notation, introduced in release 2015f. For example, for America/Sao_Paulo vanguard form contains the zone continuation line "-3:00 Brazil %z", which is simpler and more reliable than the line "-3:00 Brazil -03/-02" used in main and rearguard forms. The plan is for the main form to use %z eventually; in the meantime maintainers of zi parsers are encouraged to test the parsers on vanguard.zi. The Makefile has a new PACKRATLIST option to select a subset of 'backzone'. For example, 'make PACKRATDATA=backzone PACKRATLIST=zone.tab' now generates TZif files identical to those of the global-tz project. The Makefile has a new tailored_tarballs target for generating special-purpose tarballs. It generalizes and replaces the rearguard_tarballs target and related targets and macros, which are now obsolescent. 'make install' now defaults LOCALTIME to Factory not GMT, which means the default abbreviation is now "-00" not "GMT". Remove the posix_packrat target, marked obsolescent in 2016a. Release 2022a - 2022-03-15 23:02:01 -0700 Briefly: Palestine will spring forward on 2022-03-27, not -03-26. zdump -v now outputs better failure indications. Bug fixes for code that reads corrupted TZif data. Changes to future timestamps Palestine will spring forward on 2022-03-27, not 2022-03-26. (Thanks to Heba Hamad.) Predict future transitions for first Sunday >= March 25. Additionally, predict fallbacks to be the first Friday on or after October 23, not October's last Friday, to be more consistent with recent practice. The first differing fallback prediction is on 2025-10-24, not 2025-10-31. Changes to past timestamps From 1992 through spring 1996, Ukraine's DST transitions were at 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) Chile's Santiago Mean Time and its LMT precursor have been adjusted eastward by 1 second to align with past and present law. Changes to commentary Add several references for Chile's 1946/1947 transitions, some of which only affected portions of the country. Changes to code Fix bug when mktime gets confused by truncated TZif files with unspecified local time. (Problem reported by Almaz Mingaleev.) Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. (Problem reported by Christos Zoulas.) When reading a version 2 or later TZif file, the TZif reader now validates the version 1 header and data block only enough to skip over them, as recommended by RFC 8536 section 4. Also, the TZif reader no longer mistakenly attempts to parse a version 1 TZIf file header as a TZ string. zdump -v now outputs "(localtime failed)" and "(gmtime failed)" when local time and UT cannot be determined for a timestamp. Changes to build procedure Distribution tarballs now use standard POSIX.1-1988 ustar format instead of GNU format. Although the formats are almost identical for these tarballs, ustar headers' magic fields contain "ustar" instead of "ustar ", and their version fields contain "00" instead of " ". The two formats are planned to diverge more significantly for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar format becomes obsolete and the tarballs switch to pax format, an extension of ustar. For details about these formats, please see "pax - portable archive interchange", IEEE Std 1003.1-2017, . Release 2021e - 2021-10-21 18:41:00 -0700 Changes to future timestamps Palestine will fall back 10-29 (not 10-30) at 01:00. (Thanks to P Chan and Heba Hemad.) Release 2021d - 2021-10-15 13:48:18 -0700 Briefly: Fiji suspends DST for the 2021/2022 season. 'zic -r' marks unspecified timestamps with "-00". Changes to future timestamps Fiji will suspend observance of DST for the 2021/2022 season. Assume for now that it will return next year. (Thanks to Jashneel Kumar and P Chan.) Changes to code 'zic -r' now uses "-00" time zone abbreviations for intervals with UT offsets that are unspecified due to -r truncation. This implements a change in draft Internet RFC 8536bis. Release 2021c - 2021-10-01 14:21:49 -0700 Briefly: Revert most 2021b changes to 'backward'. Fix 'zic -b fat' bug in pre-1970 32-bit data. Fix two Link line typos. Distribute SECURITY file. This release is intended as a bugfix release, to fix compatibility problems and typos reported since 2021b was released. Changes to Link directives Revert almost all of 2021b's changes to the 'backward' file, by moving Link directives back to where they were in 2021a. Although 'zic' doesn't care which source file contains a Link directive, some downstream uses ran into trouble with the move. (Problem reported by Stephen Colebourne for Joda-Time.) Fix typo that linked Atlantic/Jan_Mayen to the wrong location (problem reported by Chris Walton). Fix 'backzone' typo that linked America/Virgin to the wrong location (problem reported by Michael Deckers). Changes to code Fix a bug in 'zic -b fat' that caused old timestamps to be mishandled in 32-bit-only readers (problem reported by Daniel Fischer). Changes to documentation Distribute the SECURITY file (problem reported by Andreas Radke). Release 2021b - 2021-09-24 16:23:00 -0700 Briefly: Jordan now starts DST on February's last Thursday. Samoa no longer observes DST. Merge more location-based Zones whose timestamps agree since 1970. Move some backward-compatibility links to 'backward'. Rename Pacific/Enderbury to Pacific/Kanton. Correct many pre-1993 transitions in Malawi, Portugal, etc. zic now creates each output file or link atomically. zic -L no longer omits the POSIX TZ string in its output. zic fixes for truncation and leap second table expiration. zic now follows POSIX for TZ strings using all-year DST. Fix some localtime crashes and bugs in obscure cases. zdump -v now outputs more-useful boundary cases. tzfile.5 better matches a draft successor to RFC 8536. A new file SECURITY. This release is prompted by recent announcements by Jordan and Samoa. It incorporates many other changes that had accumulated since 2021a. However, it omits most proposed changes that merged all Zones agreeing since 1970, as concerns were raised about doing too many of these changes at once. It does keeps some of these changes in the interest of making tzdb more equitable one step at a time; see "Merge more location-based Zones" below. Changes to future timestamps Jordan now starts DST on February's last Thursday. (Thanks to Steffen Thorsen.) Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) Changes to zone name Rename Pacific/Enderbury to Pacific/Kanton. When we added Enderbury in 1993, we did not know that it is uninhabited and that Kanton (population two dozen) is the only inhabited location in that timezone. The old name is now a backward-compatibility link. Changes to past timestamps Correct many pre-1993 transitions, fixing entries originally derived from Shanks, Whitman, and Mundell. The fixes include: - Barbados: standard time was introduced in 1911, not 1932; and DST was observed in 1942-1944 - Cook Islands: In 1899 they switched from east to west of GMT, celebrating Christmas for two days. They (and Niue) switched to standard time in 1952, not 1901. - Guyana: corrected LMT for Georgetown; the introduction of standard time in 1911, not 1915; and corrections to 1975 and 1992 transitions - Kanton: uninhabited before 1937-08-31 - Niue: only observed -11:20 from 1952 through 1964, then went to -11 instead of -11:30 - Portugal: DST was observed in 1950 - Tonga: corrected LMT; the introduction of standard time in 1945, not 1901; and corrections to the transition from +12:20 to +13 in 1961, not 1941 Additional fixes to entries in the 'backzone' file include: - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 - The Gambia: 1933 and 1942 transitions - Malawi: several 1911 through 1925 transitions - Sierra Leone: several 1913 through 1941 transitions, and DST was NOT observed in 1957 through 1962 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and Alois Treindl.) Merge more location-based Zones whose timestamps agree since 1970, as pre-1970 timestamps are out of scope. This is part of a process that has been ongoing since 2013. This does not affect post-1970 timestamps, and timezone historians who build with 'make PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. When merging, keep the most-populous location's data, and move data for other locations to 'backzone' with a backward link in 'backward'. For example, move America/Creston data to 'backzone' with a link in 'backward' from America/Phoenix because the two timezones' timestamps agree since 1970; this change affects some pre-1968 timestamps in America/Creston because Creston and Phoenix disagreed before 1968. The affected Zones are Africa/Accra, America/Atikokan, America/Blanc-Sablon, America/Creston, America/Curacao, America/Nassau, America/Port_of_Spain, Antarctica/DumontDUrville, and Antarctica/Syowa. Changes to maintenance procedure The new file SECURITY covers how to report security-related bugs. Several backward-compatibility links have been moved to the 'backward' file. These links, which range from Africa/Addis_Ababa to Pacific/Saipan, are only for compatibility with now-obsolete guidelines suggesting an entry for every ISO 3166 code. The intercontinental convenience links Asia/Istanbul and Europe/Nicosia have also been moved to 'backward'. Changes to code zic now creates each output file or link atomically, possibly by creating a temporary file and then renaming it. This avoids races where a TZ setting would temporarily stop working while zic was installing a replacement file or link. zic -L no longer omits the POSIX TZ string in its output. Starting with 2020a, zic -L truncated its output according to the "Expires" directive or "#expires" comment in the leapseconds file. The resulting TZif files omitted daylight saving transitions after the leap second table expired, which led to far less-accurate predictions of times after the expiry. Although future timestamps cannot be converted accurately in the presence of leap seconds, it is more accurate to convert near-future timestamps with a few seconds error than with an hour error, so zic -L no longer truncates output in this way. Instead, when zic -L is given the "Expires" directive, it now outputs the expiration by appending a no-change entry to the leap second table. Although this should work well with most TZif readers, it does not conform to Internet RFC 8536 and some pickier clients (including tzdb 2017c through 2021a) reject it, so "Expires" directives are currently disabled by default. To enable them, set the EXPIRES_LINE Makefile variable. If a TZif file uses this new feature it is marked with a new TZif version number 4, a format intended to be documented in a successor to RFC 8536. zic -L LEAPFILE -r @LO no longer generates an invalid TZif file that omits leap second information for the range LO..B when LO falls between two leap seconds A and B. Instead, it generates a TZif version 4 file that represents the previously-missing information. The TZif reader now allows the leap second table to begin with a correction other than -1 or +1, and to contain adjacent transitions with equal corrections. This supports TZif version 4. The TZif reader now lets leap seconds occur less than 28 days apart. This supports possible future TZif extensions. Fix bug that caused 'localtime' etc. to crash when TZ was set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does not conform to POSIX but does conform to Internet RFC 8536. Fix another bug that caused 'localtime' etc. to crash when TZ was set to a POSIX-conforming but unusual TZ string like "EST5EDT4,0/0,J365/0", where almost all the year is DST. Fix yet another bug that caused 'localtime' etc. to mishandle slim TZif files containing leap seconds after the last explicit transition in the table, or when handling far-future timestamps in slim TZif files lacking leap seconds. Fix localtime misbehavior involving positive leap seconds. This change affects only behavior for "right" system time, which contains leap seconds, and only if the UT offset is not a multiple of 60 seconds when a positive leap second occurs. (No such timezone exists in tzdb, luckily.) Without the fix, the timestamp was ambiguous during a positive leap second. With the fix, any seconds occurring after a positive leap second and within the same localtime minute are counted through 60, not through 59; their UT offset (tm_gmtoff) is the same as before. Here is how the fix affects timestamps in a timezone with UT offset +01:23:45 (5025 seconds) and with a positive leap second at 1972-06-30 23:59:60 UTC (78796800): time_t without the fix with the fix 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 ... 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 Fix an unlikely bug that caused 'localtime' etc. to misbehave if civil time changes a few seconds before time_t wraps around, when leap seconds are enabled. Fix bug in zic -r; in some cases, the dummy time type after the last time transition disagreed with the TZ string, contrary to Internet RFC 8563 section 3.3. Fix a bug with 'zic -r @X' when X is a negative leap second that has a nonnegative correction. Without the fix, the output file was truncated so that X appeared to be a positive leap second. Fix a similar, even-less-likely bug when truncating at a positive leap second that has a nonpositive correction. zic -r now reports an error if given rolling leap seconds, as this usage has never generally worked and is evidently unused. zic now generates a POSIX-conforming TZ string for TZif files where all-year DST is predicted for the indefinite future. For example, for all-year Eastern Daylight Time, zic now generates "XXX3EDT4,0/0,J365/23" where it previously generated "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for noting the possibility of POSIX conformance.) zic.c no longer requires sys/wait.h (thanks to spazmodius for noting it wasn't needed). When reading slim TZif files, zdump no longer mishandles leap seconds on the rare platforms where time_t counts leap seconds, fixing a bug introduced in 2014g. zdump -v now outputs timestamps at boundaries of what localtime and gmtime can represent, instead of the less-useful timestamps one day after the minimum and one day before the maximum. (Thanks to Arthur David Olson for prototype code, and to Manuela Friedrich for debugging help.) zdump's -c and -t options are now consistently inclusive for the lower time bound and exclusive for the upper. Formerly they were inconsistent. (Confusion noted by Martin Burnicki.) Changes to build procedure You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to non-POSIX hosts where malloc doesn't set errno. (Problem reported by Jan Engelhardt.) Changes to documentation tzfile.5 better matches a draft successor to RFC 8536 . Release 2021a - 2021-01-24 10:54:57 -0800 Changes to future timestamps South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. (Thanks to Steffen Thorsen.) Release 2020f - 2020-12-29 00:17:46 -0800 Change to build procedure 'make rearguard_tarballs' no longer generates a bad rearguard.zi, fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) Release 2020e - 2020-12-22 15:14:34 -0800 Briefly: Volgograd switches to Moscow time on 2020-12-27 at 02:00. Changes to future timestamps Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. (Thanks to Alexander Krivenyshev and Stepan Golosunov.) Changes to past timestamps Correct many pre-1986 transitions, fixing entries originally derived from Shanks. The fixes include: - Australia: several 1917 through 1971 transitions - The Bahamas: several 1941 through 1945 transitions - Bermuda: several 1917 through 1956 transitions - Belize: several 1942 through 1968 transitions - Ghana: several 1915 through 1956 transitions - Israel and Palestine: several 1940 through 1985 transitions - Kenya and adjacent: several 1908 through 1960 transitions - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 through 1919 transitions - Seychelles: the introduction of standard time in 1907, not 1906 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition (Thanks to P Chan.) Because of the Australia change, Australia/Currie (King Island) is no longer needed, as it is identical to Australia/Hobart for all timestamps since 1970 and was therefore created by mistake. Australia/Currie has been moved to the 'backward' file and its corrected data moved to the 'backzone' file. Changes to past time zone abbreviations and DST flags To better match legislation in Turks and Caicos, the 2015 shift to year-round observance of -04 is now modeled as AST throughout before returning to Eastern Time with US DST in 2018, rather than as maintaining EDT until 2015-11-01. (Thanks to P Chan.) Changes to documentation The zic man page now documents zic's coalescing of transitions when a zone falls back just before DST springs forward. Release 2020d - 2020-10-21 11:24:13 -0700 Briefly: Palestine ends DST earlier than predicted, on 2020-10-24. Changes to past and future timestamps Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 as previously predicted (thanks to Sharef Mustafa.) Its 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and its spring 2020 transition was on March 28 at 00:00, not March 27 (thanks to Pierre Cashon.) This affects Asia/Gaza and Asia/Hebron. Assume future spring and fall transitions will be on the Saturday preceding the last Sunday of March and October, respectively. Release 2020c - 2020-10-16 11:15:53 -0700 Briefly: Fiji starts DST later than usual, on 2020-12-20. Changes to future timestamps Fiji will start DST on 2020-12-20, instead of 2020-11-08 as previously predicted. DST will still end on 2021-01-17. (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that the later-than-usual start date is a one-time departure from the recent pattern. Changes to build procedure Rearguard tarballs now contain an empty file pacificnew. Some older downstream software expects this file to exist. (Problem reported by Mike Cullinan.) Release 2020b - 2020-10-06 18:35:04 -0700 Briefly: Revised predictions for Morocco's changes starting in 2023. Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. Macquarie Island has stayed in sync with Tasmania since 2011. Casey, Antarctica is at +08 in winter and +11 in summer. zic no longer supports -y, nor the TYPE field of Rules. Changes to future timestamps Morocco's spring-forward after Ramadan is now predicted to occur no sooner than two days after Ramadan, instead of one day. (Thanks to Milamber.) The first altered prediction is for 2023, now predicted to spring-forward on April 30 instead of April 23. Changes to past and future timestamps Casey Station, Antarctica has been using +08 in winter and +11 in summer since 2018. The most recent transition from +08 to +11 was 2020-10-04 00:01. Also, Macquarie Island has been staying in sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) Changes to past and future time zone abbreviations and DST flags Canada's Yukon, represented by America/Whitehorse and America/Dawson, changes its time zone rules from -08/-07 to permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. This change affects only the time zone abbreviation (MST vs PDT) and daylight saving flag for the period between the two dates. (Thanks to Andrew G. Smith.) Changes to past timestamps Correct several transitions for Hungary for 1918/1983. For example, the 1983-09-25 fall-back was at 01:00, not 03:00. (Thanks to Géza Nyáry.) Also, the 1890 transition to standard time was on 11-01, not 10-01 (thanks to Michael Deckers). The 1891 French transition was on March 16, not March 15. The 1911-03-11 French transition was at midnight, not a minute later. Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) Changes to code Support for zic's long-obsolete '-y YEARISTYPE' option has been removed and, with it, so has support for the TYPE field in Rule lines, which is now reserved for compatibility with earlier zic. These features were previously deprecated in release 2015f. (Thanks to Tim Parenti.) zic now defaults to '-b slim' instead of to '-b fat'. zic's new '-l -' and '-p -' options uninstall any existing localtime and posixrules files, respectively. The undocumented and ineffective tzsetwall function has been removed. Changes to build procedure The Makefile now defaults POSIXRULES to '-', so the posixrules feature (obsolete as of 2019b) is no longer installed by default. Changes to documentation and commentary The long-obsolete files pacificnew, systemv, and yearistype.sh have been removed from the distribution. (Thanks to Tim Parenti.) Release 2020a - 2020-04-23 16:03:47 -0700 Briefly: Morocco springs forward on 2020-05-31, not 2020-05-24. Canada's Yukon advanced to -07 year-round on 2020-03-08. America/Nuuk renamed from America/Godthab. zic now supports expiration dates for leap second lists. Changes to future timestamps Morocco's second spring-forward transition in 2020 will be May 31, not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) Adjust future-year predictions to use the first Sunday after the day after Ramadan, not the first Sunday after Ramadan. Canada's Yukon, represented by America/Whitehorse and America/Dawson, advanced to -07 year-round, beginning with its spring-forward transition on 2020-03-08, and will not fall back on 2020-11-01. Although a government press release calls this "permanent Pacific Daylight Saving Time", we prefer MST for consistency with nearby Dawson Creek, Creston, and Fort Nelson. (Thanks to Tim Parenti.) Changes to past timestamps Shanghai observed DST in 1919. (Thanks to Phake Nick.) Changes to timezone identifiers To reflect current usage in English better, America/Godthab has been renamed to America/Nuuk. A backwards-compatibility link remains for the old name. Changes to code localtime.c no longer mishandles timestamps after the last transition in a TZif file with leap seconds and with daylight saving time transitions projected into the indefinite future. For example, with TZ='America/Los_Angeles' with leap seconds, zdump formerly reported a DST transition on 2038-03-14 from 01:59:32.999... to 02:59:33 instead of the correct transition from 01:59:59.999... to 03:00:00. zic -L now supports an Expires line in the leapseconds file, and truncates the TZif output accordingly. This propagates leap second expiration information into the TZif file, and avoids the abovementioned localtime.c bug as well as similar bugs present in many client implementations. If no Expires line is present, zic -L instead truncates the TZif output based on the #expires comment present in leapseconds files distributed by tzdb 2018f and later; however, this usage is obsolescent. For now, the distributed leapseconds file has an Expires line that is commented out, so that the file can be fed to older versions of zic which ignore the commented-out line. Future tzdb distributions are planned to contain a leapseconds file with an Expires line. The configuration macros HAVE_TZNAME and USG_COMPAT should now be set to 1 if the system library supports the feature, and 2 if not. As before, these macros are nonzero if tzcode should support the feature, zero otherwise. The configuration macro ALTZONE now has the same values with the same meaning as HAVE_TZNAME and USG_COMPAT. The code's defense against CRLF in leap-seconds.list is now portable to POSIX awk. (Problem reported by Deborah Goldsmith.) Although the undocumented tzsetwall function is not changed in this release, it is now deprecated in preparation for removal in future releases. Due to POSIX requirements, tzsetwall has not worked for some time. Any code that uses it should instead use tzalloc(NULL) or, if portability trumps thread-safety, should unset the TZ environment variable. Changes to commentary The Îles-de-la-Madeleine and the Listuguj reserve are noted as following America/Halifax, and comments about Yukon's "south" and "north" have been corrected to say "east" and "west". (Thanks to Jeffery Nichols.) Release 2019c - 2019-09-11 08:59:48 -0700 Briefly: Fiji observes DST from 2019-11-10 to 2020-01-12. Norfolk Island starts observing Australian-style DST. Changes to future timestamps Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) Adjust future guesses accordingly. Norfolk Island will observe Australian-style DST starting in spring 2019. The first transition is on 2019-10-06. (Thanks to Kyle Czech and Michael Deckers.) Changes to past timestamps Many corrections to time in Turkey from 1940 through 1985. (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.) The Norfolk Island 1975-03-02 transition was at 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) South Korea observed DST from 1948 through 1951. Although this info was supposed to appear in release 2014j, a typo inadvertently suppressed the change. (Thanks to Alois Treindl.) Detroit observed DST in 1967 and 1968 following the US DST rules, except that its 1967 DST began on June 14 at 00:01. (Thanks to Alois Treindl for pointing out that the old data entries were probably wrong.) Fix several errors in pre-1970 transitions in Perry County, IN. (Thanks to Alois Treindl for pointing out the 1967/9 errors.) Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 Königsberg switched to +03 on 04-07 not 01-01. In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. (Thanks to Michael Deckers.) Changes to past time zone abbreviations and DST flags Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, is now flagged as DST and is abbreviated HKWT not HKT. Changes to code leapseconds.awk now relies only on its input data, rather than also relying on its comments. (Inspired by code from Dennis Ferguson and Chris Woodbury.) The code now defends against CRLFs in leap-seconds.list. (Thanks to Brian Inglis and Chris Woodbury.) Changes to documentation and commentary theory.html discusses leap seconds. (Thanks to Steve Summit.) Nashville's newspapers dueled about the time of day in the 1950s. (Thanks to John Seigenthaler.) Liechtenstein observed Swiss DST in 1941/2. (Thanks to Alois Treindl.) Release 2019b - 2019-07-01 00:09:53 -0700 Briefly: Brazil no longer observes DST. 'zic -b slim' outputs smaller TZif files; please try it out. Palestine's 2019 spring-forward transition was on 03-29, not 03-30. Changes to future timestamps Brazil has canceled DST and will stay on standard time indefinitely. (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de Oliveira.) Predictions for Morocco now go through 2087 instead of 2037, to work around a problem on newlib when using TZif files output by zic 2019a or earlier. (Problem reported by David Gauchard.) Changes to past and future timestamps Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess future transitions to be March's last Friday at 00:00. Changes to past timestamps Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, not 09-15 at 00:00. In 1946 its spring-forward transition was on 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1952 its fall-back transitions occurred at 04:30, not at 03:30. In 1947 its fall-back transition was on 11-30, not 12-30. (Thanks to P Chan.) Changes to past time zone abbreviations Italy's 1866 transition to Rome Mean Time was on December 12, not September 22. This affects only the time zone abbreviation for Europe/Rome between those dates. (Thanks to Stephen Trainor and Luigi Rosa.) Changes affecting metadata only Add info about the Crimea situation in zone1970.tab and zone.tab. (Problem reported by Serhii Demediuk.) Changes to code zic's new -b option supports a way to control data bloat and to test for year-2038 bugs in software that reads TZif files. 'zic -b fat' and 'zic -b slim' generate larger and smaller output; for example, changing from fat to slim shrinks the Europe/London file from 3648 to 1599 bytes, saving about 56%. Fat and slim files represent the same set of timestamps and use the same TZif format as documented in tzfile(5) and in Internet RFC 8536. Fat format attempts to work around bugs or incompatibilities in older software, notably software that mishandles 64-bit TZif data or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. Slim format is more efficient and does not work around 64-bit bugs or obsolete TZ strings. Currently zic defaults to fat format unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this out-of-the-box default is intended to change in future releases as the buggy software often mishandles timestamps anyway. zic no longer treats a set of rules ending in 2037 specially. Previously, zic assumed that such a ruleset meant that future timestamps could not be predicted, and therefore omitted a POSIX-like TZ string in the TZif output. The old behavior is no longer needed for current tzdata, and caused problems with newlib when used with older tzdata (reported by David Gauchard). zic no longer generates some artifact transitions. For example, Europe/London no longer has a no-op transition in January 1996. Changes to build procedure tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi by a percent or so. Changes to documentation and commentary The Makefile now documents the POSIXRULES macro as being obsolete, and similarly, zic's -p POSIXRULES option is now documented as being obsolete. Although the POSIXRULES feature still exists and works as before, in practice it is rarely used for its intended purpose, and it does not work either in the default reference implementation (for timestamps after 2037) or in common implementations such as GNU/Linux (for contemporary timestamps). Since POSIXRULES was designed primarily as a temporary transition facility for System V platforms that died off decades ago, it is being decommissioned rather than institutionalized. New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). Release 2019a - 2019-03-25 22:01:33 -0700 Briefly: Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. Changes to past and future timestamps Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as previously predicted. Adjust our prediction by guessing that spring transitions will be between 24 and 30 March, which matches recent practice since 2016. (Thanks to Even Scharning and Tim Parenti.) Metlakatla ended its observance of Pacific standard time, rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan Stanley and Tim Parenti.) Changes to past timestamps Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). (Thanks to Alois Treindl and Isaac Starkman.) Changes to time zone abbreviations Etc/UCT is now a backward-compatibility link to Etc/UTC, instead of being a separate zone that generates the abbreviation "UCT", which nowadays is typically a typo. (Problem reported by Isiah Meadows.) Changes to code zic now has an -r option to limit the time range of output data. For example, 'zic -r @1000000000' limits the output data to timestamps starting 1000000000 seconds after the Epoch. This helps shrink output size and can be useful for applications not needing the full timestamp history, such as TZDIST truncation; see Internet RFC 8536 section 5.1. (Inspired by a feature request from Christopher Wong, helped along by bug reports from Wong and from Tim Parenti.) Changes to documentation Mention Internet RFC 8536 (February 2019), which documents TZif. tz-link.html now cites tzdata-meta . Release 2018i - 2018-12-30 11:05:43 -0800 Briefly: São Tomé and Príncipe switches from +01 to +00 on 2019-01-01. Changes to future timestamps Due to a change in government, São Tomé and Príncipe switches back from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim Nasardinov and Michael Deckers.) Release 2018h - 2018-12-23 17:59:32 -0800 Briefly: Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. Metlakatla, Alaska observes PST this winter only. Guess Morocco will continue to adjust clocks around Ramadan. Add predictions for Iran from 2038 through 2090. Changes to future timestamps Guess that Morocco will continue to fall back just before and spring forward just after Ramadan, the practice since 2012. (Thanks to Maamar Abdelkader.) This means Morocco will observe negative DST during Ramadan in main and vanguard formats, and in rearguard format it stays in the +00 timezone and observes ordinary DST in all months other than Ramadan. As before, extend this guesswork to the year 2037. As a consequence, Morocco is scheduled to observe three DST transitions in some Gregorian years (e.g., 2033) due to the mismatch between the Gregorian and Islamic calendars. The table of exact transitions for Iranian DST has been extended. It formerly cut off before the year 2038 in a nod to 32-bit time_t. It now cuts off before 2091 as there is doubt about how the Persian calendar will treat 2091. This change predicts DST transitions in 2038-9, 2042-3, and 2046-7 to occur one day later than previously predicted. As before, post-cutoff transitions are approximated. Changes to past and future timestamps Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to +05 on 2018-12-21. This is a zone split as Qostanay (aka Kostanay) did not switch, so create a zone Asia/Qostanay. Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. It did not change clocks that day and remains on -08 this winter. (Thanks to Ryan Stanley.) It will revert to the usual Alaska rules next spring, so this change affects only timestamps from 2018-11-04 through 2019-03-10. Change to past timestamps Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, not 00:00. I transcribed the time incorrectly from Shanks. (Thanks to Phake Nick.) Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. (Thanks to Phake Nick.) Guam observed DST irregularly from 1959 through 1977. (Thanks to Phake Nick.) Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 10-01 changed standard time to +08:30 (not +08). Its transition back to +08 after WWII was on 1945-09-15, not the previous day. Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, its 1952 fallback was on 11-02 (not 10-25). This release contains many changes to timestamps before 1946 due to Japanese possession or occupation of Pacific/Chuuk, Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. (Thanks to Phake Nick.) Assume that the Spanish East Indies was like the Philippines and observed American time until the end of 1844. This affects Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. Changes to past tm_isdst flags For the recent Morocco change, the tm_isdst flag should be 1 from 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) Give a URL to the official decree. (Thanks to Matt Johnson.) Release 2018g - 2018-10-26 22:22:45 -0700 Briefly: Morocco switches to permanent +01 on 2018-10-28. Changes to future timestamps Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, so its clocks will not fall back as previously scheduled. (Thanks to Mohamed Essedik Najd and Brian Inglis.) Changes to code When generating TZif files with leap seconds, zic no longer uses a format that trips up older 32-bit clients, fixing a bug introduced in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround for QTBUG-53071 now also works for TZif files with leap seconds. The translator to rearguard format now rewrites the line "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 and earlier. (Reported by Christos Zoulas.) Changes to past time zone abbreviations Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. This reverts to 2011h, as the abbreviation change in 2011i was likely inadvertent. Changes to documentation tzfile.5 has new sections on interoperability issues. Release 2018f - 2018-10-18 00:14:18 -0700 Briefly: Volgograd moves from +03 to +04 on 2018-10-28. Fiji ends DST 2019-01-13, not 2019-01-20. Most of Chile changes DST dates, effective 2019-04-06. Changes to future timestamps Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. (Thanks to Alexander Fetisov and Stepan Golosunov.) Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously predicted. (Thanks to Raymond Kumar.) Adjust future predictions accordingly. Most of Chile will end DST on the first Saturday in April at 24:00 mainland time, and resume DST on the first Saturday in September at 24:00 mainland time. The changes are effective from 2019-04-06, and do not affect the Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa and Tim Parenti.) Adjust future predictions accordingly. Changes to past timestamps The 2018-05-05 North Korea 30-minute time zone change took place at 23:30 the previous day, not at 00:00 that day. China's 1988 spring-forward transition was on April 17, not April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. (Thanks to P Chan.) Fix several issues for Macau before 1992. Macau's pre-1904 LMT was off by 10 s. Macau switched to +08 in 1904 not 1912, and temporarily switched to +09/+10 during World War II. Macau observed DST in 1942/79, not 1961/80, and there were several errors for transition times and dates. (Thanks to P Chan.) The 1948-1951 fallback transitions in Japan were at 25:00 on September's second Saturday, not at 24:00. (Thanks to Phake Nick.) zic turns this into 01:00 on the day after September's second Saturday, which is the best that POSIX or C platforms can do. Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 paper by Li Yu, replacing more-questionable data from Shanks. Changes to time zone abbreviations Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) Changes to code zic now always generates TZif files where time type 0 is used for timestamps before the first transition. This simplifies the reading of TZif files and should not affect behavior of existing TZif readers because the same set of time types is used; only their internal indexes may have changed. This affects only the legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and EET, which previously used nonzero types for these timestamps. Because of the type 0 change, zic no longer outputs a dummy transition at time -2**59 (before the Big Bang), as clients should no longer need this to handle historical timestamps correctly. This reverts a change introduced in 2013d and shrinks most TZif files by a few bytes. zic now supports negative time-of-day in Rule and Leap lines, e.g., "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition occurs at 18:00 on the Saturday before the last Sunday in April. This behavior was documented in 2018a but the code did not entirely match the documentation. localtime.c no longer requires at least one time type in TZif files that lack transitions or have a POSIX-style TZ string. This future-proofs the code against possible future extensions to the format that would allow TZif files with POSIX-style TZ strings and without transitions or time types. A read-access subscript error in localtime.c has been fixed. It could occur only in TZif files with timecnt == 0, something that does not happen in practice now but could happen in future versions. localtime.c no longer ignores TZif POSIX-style TZ strings that specify only standard time. Instead, these TZ strings now override the default time type for timestamps after the last transition (or for all timestamps if there are no transitions), just as DST strings specifying DST have always done. leapseconds.awk now outputs "#updated" and "#expires" comments, and supports leap seconds at the ends of months other than June and December. (Inspired by suggestions from Chris Woodbury.) Changes to documentation New restrictions: A Rule name must start with a character that is neither an ASCII digit nor "-" nor "+", and an unquoted name should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". The latter restriction makes room for future extensions (a possibility noted by Tom Lane). tzfile.5 now documents what time types apply before the first and after the last transition, if any. Documentation now uses the spelling "timezone" for a TZ setting that determines timestamp history, and "time zone" for a geographic region currently sharing the same standard time. The name "TZif" is now used for the tz binary data format. tz-link.htm now mentions the A0 TimeZone Migration utilities. (Thanks to Aldrin Martoq for the link.) Changes to build procedure New 'make' target 'rearguard_tarballs' to build the rearguard tarball only. This is a convenience on platforms that lack lzip if you want to build the rearguard tarball. (Problem reported by Deborah Goldsmith.) tzdata.zi is now more stable from release to release. (Problem noted by Tom Lane.) It is also a bit shorter. tzdata.zi now can contain comment lines documenting configuration information, such as which data format was selected, which input files were used, and how leap seconds are treated. (Problems noted by Lester Caine and Brian Inglis.) If the Makefile defaults are used these comment lines are absent, for backward compatibility. A redistributor intending to alter its copy of the files should also append "-LABEL" to the 'version' file's first line, where "LABEL" identifies the redistributor's change. Release 2018e - 2018-05-01 23:42:51 -0700 Briefly: North Korea switches back to +09 on 2018-05-05. The main format uses negative DST again, for Ireland etc. 'make tarballs' now also builds a rearguard tarball. New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. Changes to past and future timestamps North Korea switches back from +0830 to +09 on 2018-05-05. (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, and Tim Parenti.) Bring back the negative-DST changes of 2018a, except be more compatible with data parsers that do not support negative DST. Also, this now affects historical timestamps in Namibia and the former Czechoslovakia, not just Ireland. The main format now uses negative DST to model timestamps in Europe/Dublin (from 1971 on), Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This does not affect UT offsets, only time zone abbreviations and the tm_isdst flag. Also, this does not affect rearguard or vanguard formats; effectively the main format now uses vanguard instead of rearguard format. Data parsers that do not support negative DST can still use data from the rearguard tarball described below. Changes to build procedure The command 'make tarballs' now also builds the tarball tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz except that it uses rearguard format intended for trailing-edge data parsers. Changes to data format and to code The SAVE column of Rule and Zone lines can now have an 's' or 'd' suffix, which specifies whether the adjusted time is standard time or daylight saving time. If no suffix is given, daylight saving time is used if and only if the SAVE column is nonzero; this is the longstanding behavior. Although this new feature is not used in tzdata, it could be used to specify the legal time in Namibia 1994-2017, as opposed to the popular time (see below). Changes to past timestamps From 1994 through 2017 Namibia observed DST in winter, not summer. That is, it used negative DST, as Ireland still does. This change does not affect UTC offsets; it affects only the tm_isdst flag and the abbreviation used during summer, which is now CAT, not WAST. Although (as noted by Michael Deckers) summer and winter time were both simply called "standard time" in Namibian law, in common practice winter time was considered to be DST (as noted by Stephen Colebourne). The full effect of this change is only in vanguard and main format; in rearguard format, the tm_isdst flag is still zero in winter and nonzero in summer. In 1946/7 Czechoslovakia also observed negative DST in winter. The full effect of this change is only in vanguard and main formats; in rearguard format, it is modeled as plain GMT without daylight saving. Also, the dates of some 1944/5 DST transitions in Czechoslovakia have been changed. Release 2018d - 2018-03-22 07:05:46 -0700 Briefly: Palestine starts DST a week earlier in 2018. Add support for vanguard and rearguard data consumers. Add subsecond precision to source data format, though not to data. Changes to future timestamps In 2018, Palestine starts DST on March 24, not March 31. Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) Changes to past and future timestamps Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 at 04:00. (Thanks to Steffen Thorsen.) Changes to past timestamps Historical transitions for Uruguay, represented by America/Montevideo, have been updated per official legal documents, replacing previous data mainly originating from the inventions of Shanks & Pottenger. This has resulted in adjustments ranging from 30 to 90 minutes in either direction over at least two dozen distinct periods ranging from one day to several years in length. A mere handful of pre-1991 transitions are unaffected; data since then has come from more reliable contemporaneous reporting. These changes affect various timestamps in 1920-1923, 1936, 1939, 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. Additionally, Uruguay's pre-standard-time UT offset has been adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to match the location of the Observatory of the National Meteorological Institute in Montevideo. (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. (Thanks to Kerry Shetline.) Fix the 1912-01-01 transition for Portugal and its colonies. This transition was at 00:00 according to the new UT offset, not according to the old one. Also assume that Cape Verde switched on the same date as the rest, not in 1907. This affects Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. (Thanks to Michael Deckers.) Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in Turks & Caicos. Changes to past time zone abbreviations MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There is no clock change associated with the transition. Changes to build procedure The new DATAFORM macro in the Makefile lets the installer choose among three source data formats. The idea is to lessen downstream disruption when data formats are improved. * DATAFORM=vanguard installs from the latest, bleeding-edge format. DATAFORM=main (the default) installs from the format used in the 'africa' etc. files. DATAFORM=rearguard installs from a trailing-edge format. Eventually, elements of today's vanguard format should move to the main format, and similarly the main format's features should eventually move to the rearguard format. * In the current version, the main and rearguard formats are identical and match that of 2018c, so this change does not affect default behavior. The vanguard format currently contains one feature not in the main format: negative SAVE values. This improves support for Ireland, which uses Irish Standard Time (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has supported negative SAVE values for decades, and this feature should move to the main format soon. However, it will not move to the rearguard format for quite some time because some downstream parsers do not support it. * The build procedure constructs three files vanguard.zi, main.zi, and rearguard.zi, one for each format. Although the files represent essentially the same data, they may have minor discrepancies that users are not likely to notice. The files are intended for downstream data consumers and are not installed. Zoneinfo parsers that do not support negative SAVE values should start using rearguard.zi, so that they will be unaffected when the negative-DST feature moves from vanguard to main. Bleeding-edge Zoneinfo parsers that support the new features already can use vanguard.zi; in this respect, current tzcode is bleeding-edge. The Makefile should now be safe for parallelized builds, and 'make -j to2050new.tzs' is now much faster on a multiprocessor host with GNU Make. When built with -DSUPPRESS_TZDIR, the tzcode library no longer prepends TZDIR/ to file names that do not begin with '/'. This is not recommended for general use, due to its security implications. (From a suggestion by Manuela Friedrich.) Changes to code zic now accepts subsecond precision in expressions like 00:19:32.13, which is approximately the legal time of the Netherlands from 1835 to 1937. However, because it is questionable whether the few recorded uses of non-integer offsets had subsecond precision in practice, there are no plans for tzdata to use this feature. (Thanks to Steve Allen for pointing out the limitations of historical data in this area.) The code is a bit more portable to MS-Windows. Installers can compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that reserve identifiers like 'localtime'. (Thanks to Manuela Friedrich.) Changes to documentation and commentary theory.html now outlines tzdb's extensions to POSIX's model for civil time, and has a section "POSIX features no longer needed" that lists POSIX API components that are now vestigial. (From suggestions by Steve Summit.) It also better distinguishes time zones from tz regions. (From a suggestion by Guy Harris.) Commentary is now more consistent about using the phrase "daylight saving time", to match the C name tm_isdst. Daylight saving time need not occur in summer, and need not have a positive offset from standard time. Commentary about historical transitions in Uruguay has been expanded with links to many relevant legal documents. (Thanks to Tim Parenti.) Commentary now uses some non-ASCII characters with Unicode value less than U+0100, as they can be useful and should work even with older editors such as XEmacs. Release 2018c - 2018-01-22 23:00:44 -0800 Briefly: Revert Irish changes that relied on negative SAVE values. Changes to tm_isdst Revert the 2018a change to Europe/Dublin. As before, this change does not affect UT offsets or abbreviations; it affects only whether timestamps are considered to be standard time or daylight-saving time, as expressed in the tm_isdst flag of C's struct tm type. This reversion is intended to be a temporary workaround for problems discovered with downstream uses of releases 2018a and 2018b, which implemented Irish time by using negative SAVE values in the Eire rules of the 'europe' file. Although negative SAVE values have been part of tzcode for many years and are supported by many platforms, they were not documented before 2018a and ICU and OpenJDK do not currently support them. A mechanism to export data to platforms lacking support for negative DST is planned to be developed before the change is reapplied. (Problems reported by Deborah Goldsmith and Stephen Colebourne.) Changes to past timestamps Japanese DST transitions (1948-1951) were Sundays at 00:00, not Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) Changes to build procedure The build procedure now works around mawk 1.3.3's lack of support for character class expressions. (Problem reported by Ohyama.) Release 2018b - 2018-01-17 23:24:48 -0800 Briefly: Fix a packaging problem in tz2018a, which was missing 'pacificnew'. Changes to build procedure The distribution now contains the file 'pacificnew' again. This file was inadvertently omitted in the 2018a distribution. (Problem reported by Matias Fonzo.) Release 2018a - 2018-01-12 22:29:21 -0800 Briefly: São Tomé and Príncipe switched from +00 to +01. Brazil's DST will now start on November's first Sunday. Ireland's standard time is now in the summer, not the winter. Use Debian-style installation locations, instead of 4.3BSD-style. New zic option -t. Changes to past and future timestamps São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) Changes to future timestamps Starting in 2018 southern Brazil will begin DST on November's first Sunday instead of October's third Sunday. (Thanks to Steffen Thorsen.) Changes to past timestamps A discrepancy of 4 s in timestamps before 1931 in South Sudan has been corrected. The 'backzone' and 'zone.tab' files did not agree with the 'africa' and 'zone1970.tab' files. (Problem reported by Michael Deckers.) The abbreviation invented for Bolivia Summer Time (1931-2) is now BST instead of BOST, to be more consistent with the convention used for Latvian Summer Time (1918-9) and for British Summer Time. Changes to tm_isdst Change Europe/Dublin so that it observes Irish Standard Time (UT +01) in summer and GMT (as negative daylight-saving) in winter, instead of observing standard time (GMT) in winter and Irish Summer Time (UT +01) in summer. This change does not affect UT offsets or abbreviations; it affects only whether timestamps are considered to be standard time or daylight-saving time, as expressed in the tm_isdst flag of C's struct tm type. (Discrepancy noted by Derick Rethans.) Changes to build procedure The default installation locations have been changed to mostly match Debian circa 2017, instead of being designed as an add-on to 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor locations more precisely. (This responds to suggestions from Brian Inglis and from Steve Summit.) The default installation procedure no longer creates the backward-compatibility link US/Pacific-New, which causes confusion during user setup (e.g., see Debian bug 815200). Use 'make BACKWARD="backward pacificnew"' to create the link anyway, for now. Eventually we plan to remove the link entirely. tzdata.zi now contains a version-number comment. (Suggested by Tom Lane.) The Makefile now quotes values like BACKWARD more carefully when passing them to the shell. (Problem reported by Zefram.) Builders no longer need to specify -DHAVE_SNPRINTF on platforms that have snprintf and use pre-C99 compilers. (Problem reported by Jon Skeet.) Changes to code zic has a new option -t FILE that specifies the location of the file that determines local time when TZ is unset. The default for this location can be configured via the new TZDEFAULT makefile macro, which defaults to /etc/localtime. Diagnostics and commentary now distinguish UT from UTC more carefully; see theory.html for more information about UT vs UTC. zic has been ported to GCC 8's -Wstringop-truncation option. (Problem reported by Martin Sebor.) Changes to documentation and commentary The zic man page now documents the longstanding behavior that times and years can be out of the usual range, with negative times counting backwards from midnight and with year 0 preceding year 1. (Problem reported by Michael Deckers.) The theory.html file now mentions the POSIX limit of six chars per abbreviation, and lists alphabetic abbreviations used. The files tz-art.htm and tz-link.htm have been renamed to tz-art.html and tz-link.html, respectively, for consistency with other file names and to simplify web server configuration. Release 2017c - 2017-10-20 14:49:34 -0700 Briefly: Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. Fiji ends DST 2018-01-14, not 2018-01-21. Namibia switches from +01/+02 to +02 on 2018-04-01. Sudan switches from +03 to +02 on 2017-11-01. Tonga likely switches from +13/+14 to +13 on 2017-11-05. Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. A new file tzdata.zi now holds a small text copy of all data. The zic input format has been regularized slightly. Changes to future timestamps Northern Cyprus has decided to resume EU rules starting 2017-10-29, thus reinstituting winter time. Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously predicted. (Thanks to Dominic Fok.) Adjust future predictions accordingly. Namibia will switch from +01 with DST to +02 all year on 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 at 02:00. (Thanks to Steffen Thorsen.) Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed Atyya and Yahia Abdalla.) South Sudan is not switching, so Africa/Juba is no longer a link to Africa/Khartoum. Tonga has likely ended its experiment with DST, and will not adjust its clocks on 2017-11-05. Although Tonga has not announced whether it will continue to observe DST, the IATA is assuming that it will not. (Thanks to David Wade.) Turks & Caicos will switch from -04 all year to -05 with US DST on 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 at 02:00. (Thanks to Steffen Thorsen.) Changes to past timestamps Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. (Thanks to Arthur David Olson.) Detroit did not observe DST in 1967. Use railway time for Asia/Kolkata before 1941, by switching to Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. Europe/Dublin's 1946 and 1947 fallback transitions occurred at 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to American time in 1892, not 1879. (Thanks to Michael Deckers.) Adjust the 1867 transition in Alaska to better reflect the historical record, by changing it to occur on 1867-10-18 at 15:30 Sitka time rather than at the start of 1867-10-17 local time. Although strictly speaking this is accurate only for Sitka, the rest of Alaska's blanks need to be filled in somehow. Fix off-by-one errors in UT offsets for Adak and Nome before 1867. (Thanks to Michael Deckers.) Add 7 s to the UT offset in Asia/Yangon before 1920. Changes to zone names Remove Canada/East-Saskatchewan from the 'backward' file, as it exceeded the 14-character limit and was an unused misnomer anyway. Changes to build procedure To support applications that prefer to read time zone data in text form, two zic input files tzdata.zi and leapseconds are now installed by default. The commands 'zic tzdata.zi' and 'zic -L leapseconds tzdata.zi' can reproduce the tzdata binary files without and with leap seconds, respectively. To prevent these two new files from being installed, use 'make TZDATA_TEXT=', and to suppress leap seconds from the tzdata text installation, use 'make TZDATA_TEXT=tzdata.zi'. 'make BACKWARD=' now suppresses backward-compatibility names like 'US/Pacific' that are defined in the 'backward' and 'pacificnew' files. 'make check' now works on systems that lack a UTF-8 locale, or that lack the nsgmls program. Set UTF8_LOCALE to configure the name of a UTF-8 locale, if you have one. Y2K runtime checks are no longer enabled by default. Add -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU to disable them. (New name suggested by Brian Inglis.) The build procedure for zdump now works on AIX 7.1. (Problem reported by Kees Dekker.) Changes to code zic and the reference runtime now reject multiple leap seconds within 28 days of each other, or leap seconds before the Epoch. As a result, support for double leap seconds, which was obsolescent and undocumented, has been removed. Double leap seconds were an error in the C89 standard; they have never existed in civil timekeeping. (Thanks to Robert Elz and Bradley White for noticing glitches in the code that uncovered this problem.) zic now warns about use of the obsolescent and undocumented -y option, and about use of the obsolescent TYPE field of Rule lines. zic now allows unambiguous abbreviations like "Sa" and "Su" for weekdays; formerly it rejected them due to a bug. Conversely, zic no longer considers non-prefixes to be abbreviations; for example, it no longer accepts "lF" as an abbreviation for "lastFriday". Also, zic warns about the undocumented usage with a "last-" prefix, e.g., "last-Fri". Similarly, zic now accepts the unambiguous abbreviation "L" for "Link" in ordinary context and for "Leap" in leap-second context. Conversely, zic no longer accepts non-prefixes such as "La" as abbreviations for words like "Leap". zic no longer accepts leap second lines in ordinary input, or ordinary lines in leap second input. Formerly, zic sometimes warned about this undocumented usage and handled it incorrectly. The new macro HAVE_TZNAME governs whether the tzname external variable is exported, instead of USG_COMPAT. USG_COMPAT now governs only the external variables "timezone" and "daylight". This change is needed because the three variables are not in the same category: although POSIX requires tzname, it specifies the other two variables as optional. Also, USG_COMPAT is now 1 or 0: if not defined, the code attempts to guess it from other macros. localtime.c and difftime.c no longer require stdio.h, and .c files other than zic.c no longer require sys/wait.h. zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) Calculation of time_t extrema works around a bug in GCC 4.8.4 (Reported by Stan Shebs and Joseph Myers.) zic.c no longer mistranslates formats of line numbers in non-English locales. (Problem reported by Benno Schulenberg.) Several minor changes have been made to the code to make it a bit easier to port to MS-Windows and Solaris. (Thanks to Kees Dekker for reporting the problems.) Changes to documentation and commentary The two new files 'theory.html' and 'calendars' contain the contents of the removed file 'Theory'. The goal is to document tzdb theory more accessibly. The zic man page now documents abbreviation rules. tz-link.htm now covers how to apply tzdata changes to clients. (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL. The leap-seconds.list URL has been updated to something that is more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) Release 2017b - 2017-03-17 07:30:38 -0700 Briefly: Haiti has resumed DST. Changes to past and future timestamps Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) Changes to past timestamps Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" is one byte over the POSIX limit. (Problem reported by Derick Rethans.) Changes to code The reference localtime implementation now falls back on the current US daylight-saving transition rules rather than the 1987-2006 rules. This fallback occurs only when (1) the TZ environment variable has a value like "AST4ADT" that asks for daylight saving time but does not specify the rules, (2) there is no file by that name, and (3) the TZDEFRULES file cannot be loaded. (Thanks to Tom Lane.) Release 2017a - 2017-02-28 00:05:36 -0800 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia discontinues DST. Changes to future timestamps Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) Chile's Region of Magallanes moves from -04/-03 to -03 year-round. Its clocks diverge from America/Santiago starting 2017-05-13 at 23:00, hiving off a new zone America/Punta_Arenas. Although the Chilean government says this change expires in May 2019, for now assume it's permanent. (Thanks to Juan Correa and Deborah Goldsmith.) This also affects Antarctica/Palmer. Changes to past timestamps Fix many entries for historical timestamps for Europe/Madrid before 1979, to agree with tables compiled by Pere Planesas of the National Astronomical Observatory of Spain. As a side effect, this changes some timestamps for Africa/Ceuta before 1929, which are probably guesswork anyway. (Thanks to Steve Allen and Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for correcting the 1901 transition.) Ecuador observed DST from 1992-11-28 to 1993-02-05. (Thanks to Alois Treindl.) Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. (Thanks to Stepan Golosunov.) Changes to past and future time zone abbreviations Switch to numeric time zone abbreviations for South America, as part of the ongoing project of removing invented abbreviations. This avoids the need to invent an abbreviation for the new Chilean new zone. Similarly, switch from invented to numeric time zone abbreviations for Afghanistan, American Samoa, the Azores, Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and Xinjiang; for 20-minute daylight saving time in Ghana before 1943; for half-hour daylight saving time in Belize before 1944 and in the Dominican Republic before 1975; and for Canary Islands before 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for Indian Summer Time before 1942, for Indonesia before around 1964, for Kenya before 1960, for Liberia before 1973, for Madeira before 1967, for Namibia before 1943, for the Netherlands in 1937-9, for Pakistan before 1971, for Western Sahara before 1977, and for Zaporozhye in 1880-1924. For Alaska time from 1900 through 1967, instead of "CAT" use the abbreviation "AST", the abbreviation commonly used at the time (Atlantic Standard Time had not been standardized yet). Use "AWT" and "APT" instead of the invented abbreviations "CAWT" and "CAPT". Use "CST" and "CDT" instead of invented abbreviations for Macau before 1999 and Taiwan before 1938, and use "JST" instead of the invented abbreviation "JCST" for Japan and Korea before 1938. Change to database entry category Move the Pacific/Johnston link from 'australasia' to 'backward', since Johnston is now uninhabited. Changes to code zic no longer mishandles some transitions in January 2038 when it attempts to work around Qt bug 53071. This fixes a bug affecting Pacific/Tongatapu that was introduced in zic 2016e. localtime.c now contains a workaround, useful when loading a file generated by a buggy zic. (Problem and localtime.c fix reported by Bradley White.) zdump -i now outputs non-hour numeric time zone abbreviations without a colon, e.g., "+0530" rather than "+05:30". This agrees with zic %z and with common practice, and simplifies auditing of zdump output. zdump is now buildable again with -DUSE_LTZ=0. (Problem reported by Joseph Myers.) zdump.c now always includes private.h, to avoid code duplication with private.h. (Problem reported by Kees Dekker.) localtime.c no longer mishandles early or late timestamps when TZ is set to a POSIX-style string that specifies DST. (Problem reported by Kees Dekker.) date and strftime now cause %z to generate "-0000" instead of "+0000" when the UT offset is zero and the time zone abbreviation begins with "-". Changes to documentation and commentary The 'Theory' file now better documents choice of historical time zone abbreviations. (Problems reported by Michael Deckers.) tz-link.htm now covers leap smearing, which is popular in clouds. Release 2016j - 2016-11-22 23:17:13 -0800 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. Changes to future timestamps Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. This hives off a new zone Europe/Saratov from Europe/Volgograd. (Thanks to Yuri Konotopov and Stepan Golosunov.) Changes to past timestamps The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 1999, not fall 1994. (Thanks to Stepan Golosunov.) Changes to past time zone abbreviations Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote summer time before 1948. The old use of "EET" was a typo. Changes to code zic no longer mishandles file systems that lack hard links, fixing bugs introduced in 2016g. (Problems reported by Tom Lane.) Also, when the destination already contains symbolic links, zic should now work better on systems where the 'link' system call does not follow symbolic links. Changes to documentation and commentary tz-link.htm now documents the relationship between release version numbers and development-repository commit tags. (Suggested by Paul Koning.) The 'Theory' file now documents UT. iso3166.tab now accents "Curaçao", and commentary now mentions the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.) Release 2016i - 2016-11-01 23:19:52 -0700 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga reintroduces DST on 2016-11-06. Changes to future timestamps Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2017-01-15 at 03:00. Assume future observances in Tonga will be from the first Sunday in November through the third Sunday in January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric time zone abbreviations for this zone. Changes to past and future timestamps Northern Cyprus is now +03 year round, causing a split in Cyprus time zones starting 2016-10-30 at 04:00. This creates a zone Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) Antarctica/Casey switched from +08 to +11 on 2016-10-22. (Thanks to Steffen Thorsen.) Changes to past timestamps Several corrections were made for pre-1975 timestamps in Italy. These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and Europe/Vatican. First, the 1893-11-01 00:00 transition in Italy used the new UT offset (+01), not the old (+00:49:56). (Thanks to Michael Deckers.) Second, rules for daylight saving in Italy were changed to agree with Italy's National Institute of Metrological Research (INRiM) except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian Inglis, and Michael Deckers): The 1916-06-03 transition was at 24:00, not 00:00. The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 00:00, not 01:00. The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 01:00. The 1944-09-17 transition was at 03:00, not 01:00. This particular change is taken from Italian law as INRiM's table, (which says 02:00) appears to have a typo here. Also, keep the 1944-04-03 transition for Europe/Rome, as Rome was controlled by Germany then. The 1967-1970 and 1972-1974 fallback transitions were at 01:00, not 00:00. Changes to code The code should now be buildable on AmigaOS merely by setting the appropriate Makefile variables. (From a patch by Carsten Larsen.) Release 2016h - 2016-10-19 23:17:57 -0700 Changes to future timestamps Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that future fall transitions will be on the last Saturday of October at 01:00, which is consistent with predicted spring transitions on the last Saturday of March. (Thanks to Tim Parenti.) Changes to past timestamps In Turkey, transitions in 1986-1990 were at 01:00 standard time not at 02:00, and the spring 1994 transition was on March 20, not March 27. (Thanks to Kıvanç Yazan.) Changes to past and future time zone abbreviations Asia/Colombo now uses numeric time zone abbreviations like "+0530" instead of alphabetic ones like "IST" and "LKT". Various English-language sources use "IST", "LKT" and "SLST", with no working consensus. (Usage of "SLST" mentioned by Sadika Sumanapala.) Changes to code zic no longer mishandles relativizing file names when creating symbolic links like /etc/localtime, when these symbolic links are outside the usual directory hierarchy. This fixes a bug introduced in 2016g. (Problem reported by Andreas Stieger.) Changes to build procedure New rules 'traditional_tarballs' and 'traditional_signatures' for building just the traditional-format distribution. (Requested by Deborah Goldsmith.) The file 'version' is now put into the tzdata tarball too. (Requested by Howard Hinnant.) Changes to documentation and commentary The 'Theory' file now has a section on interface stability. (Requested by Paul Koning.) It also mentions features like tm_zone and localtime_rz that have long been supported by the reference code. tz-link.htm has improved coverage of time zone boundaries suitable for geolocation. (Thanks to heads-ups from Evan Siroky and Matt Johnson.) The US commentary now mentions Allen and the "day of two noons". The Fiji commentary mentions the government's 2016-10-03 press release. (Thanks to Raymond Kumar.) Release 2016g - 2016-09-13 08:56:38 -0700 Changes to future timestamps Turkey switched from EET/EEST (+02/+03) to permanent +03, effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather than an invented abbreviation for the new time. New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. (Thanks to Tim Parenti.) Changes to past timestamps For America/Los_Angeles, spring-forward transition times have been corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 1950-1966. For zones using Soviet time on 1919-07-01, transitions to UT-based time were at 00:00 UT, not at 02:00 local time. The affected zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) Changes to past and future time zone abbreviations The Factory zone now uses the time zone abbreviation -00 instead of a long English-language string, as -00 is now the normal way to represent an undefined time zone. Several zones in Antarctica and the former Soviet Union, along with zones intended for ships at sea that cannot use POSIX TZ strings, now use numeric time zone abbreviations instead of invented or obsolete alphanumeric abbreviations. The affected zones are Antarctica/Casey, Antarctica/Davis, Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, Europe/Minsk, Europe/Samara, Europe/Volgograd, and Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM was replaced by +05, whereas MSK and MSD were kept as they are not our invention and are widely used. Changes to zone names Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. (Thanks to David Massoud.) Changes to code zic no longer generates binary files containing POSIX TZ-like strings that disagree with the local time type after the last explicit transition in the data. This fixes a bug with Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps on the reference platform. (Thanks to Alexander Belopolsky for reporting the bug and suggesting a way forward.) If the installed localtime and/or posixrules files are symbolic links, zic now keeps them symbolic links when updating them, for compatibility with platforms like OpenSUSE where other programs configure these files as symlinks. zic now avoids hard linking to symbolic links, avoids some unnecessary mkdir and stat system calls, and uses shorter file names internally. zdump has a new -i option to generate transitions in a more-compact but still human-readable format. This option is experimental, and the output format may change in future versions. (Thanks to Jon Skeet for suggesting that an option was needed, and thanks to Tim Parenti and Chris Rovick for further comments.) Changes to build procedure An experimental distribution format is available, in addition to the traditional format which will continue to be distributed. The new format is a tarball tzdb-VERSION.tar.lz with signature file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory tzdb-VERSION containing the code and data of the traditional two-tarball format, along with extra data that may be useful. (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others for comments about the experimental format.) The release version number is now more accurate in the usual case where releases are built from a Git repository. For example, if 23 commits and some working-file changes have been made since release 2016g, the version number is now something like '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. Tagged releases use the same version number format as before, e.g., '2016g'. To support the more-accurate version number, its specification has moved from a line in the Makefile to a new source file 'version'. The experimental distribution contains a file to2050.tzs that contains what should be the output of 'zdump -i -c 2050' on primary zones. If this file is available, 'make check' now checks that zdump generates this output. 'make check_web' now works on Fedora-like distributions. Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like strings that is now implemented by zic. Comments now cite URLs for some 1917-1921 Russian DST decrees. (Thanks to Alexander Belopolsky.) tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J (thanks to Meno Hochschild) and ThreeTen-Extra, and its description of Java 8 has been brought up to date (thanks to Stephen Colebourne). Its description of local time on Mars has been updated to match current practice, and URLs have been updated and some obsolete ones removed. Release 2016f - 2016-07-05 16:26:51 +0200 Changes affecting future timestamps The Egyptian government changed its mind on short notice, and Africa/Cairo will not introduce DST starting 2016-07-07 after all. (Thanks to Mina Samuel.) Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. (Thanks to Stepan Golosunov.) Changes to past and future timestamps Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone abbreviations instead of invented ones. Changes affecting past timestamps Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. (Thanks to Stepan Golosunov.) Release 2016e - 2016-06-14 08:46:16 -0700 Changes affecting future timestamps Africa/Cairo observes DST in 2016 from July 7 to the end of October. Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) For future years, guess April's last Thursday to October's last Thursday except for Ramadan. Changes affecting past timestamps Locations while uninhabited now use '-00', not 'zzz', as a placeholder time zone abbreviation. This is inspired by Internet RFC 3339 and is more consistent with numeric time zone abbreviations already used elsewhere. The change affects several arctic and antarctic locations, e.g., America/Cambridge_Bay before 1920 and Antarctica/Troll before 2005. Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) Changes to code zic now outputs a dummy transition at time 2**31 - 1 in zones whose POSIX-style TZ strings contain a '<'. This mostly works around Qt bug 53071 . (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) Changes affecting documentation and commentary tz-link.htm says why governments should give plenty of notice for time zone or DST changes, and refers to Matt Johnson's blog post. tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) Release 2016d - 2016-04-17 22:50:29 -0700 Changes affecting future timestamps America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. (Thanks to Alexander Krivenyshev for the heads-up.) Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. (Thanks to Alexander Krivenyshev and Matt Johnson.) New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 at 02:00. (Thanks to Stepan Golosunov.) Changes affecting past timestamps New zone Europe/Kirov, split off from Europe/Volgograd. It covers Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made the same change. (Thanks to Stepan Golosunov.) Russia and nearby locations had daylight-saving transitions on 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan Golosunov.) Many corrections to historical time in Kazakhstan from 1991 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's invented time zone abbreviations with numeric abbreviations. Changes to commentary Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). Release 2016c - 2016-03-23 00:51:27 -0700 Changes affecting future timestamps Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) Chile reverts from permanent to seasonal DST. (Thanks to Juan Correa for the heads-up, and to Tim Parenti for corrections.) Guess that future transitions are August's and May's second Saturdays at 24:00 mainland time. Also, call the period from 2014-09-07 through 2016-05-14 daylight saving time instead of standard time, as that seems more appropriate now. Changes affecting past timestamps Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. (Thanks to Stepan Golosunov.) Changes to commentary Several updates and URLs for historical and proposed Russian changes. (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) Release 2016b - 2016-03-12 17:30:14 -0800 Compatibility note Starting with release 2016b, some data entries cause zic implementations derived from tz releases 2005j through 2015e to issue warnings like "time zone abbreviation differs from POSIX standard (+03)". These warnings should not otherwise affect zic's output and can safely be ignored on today's platforms, as the warnings refer to a restriction in POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the warnings is to upgrade to zic derived from tz releases 2015f and later. Changes affecting future timestamps New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2016-03-27 at 02:00 local time. They need distinct zones since their post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and Altai Republic, Russia, which will switch from +06 to +07 on the same date and local time. The Astrakhan change is already official; the others have passed the first reading in the State Duma and are extremely likely. Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson and Stepan Golosunov for followup.) As a trial of a new system that needs less information to be made up, the new zones use numeric time zone abbreviations like "+04" instead of invented abbreviations like "ASTT". Haiti will not observe DST in 2016. (Thanks to Jean Antoine via Steffen Thorsen.) Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. (Thanks to Hannah Kreitem.) Guess future transitions will be March's last Saturday at 01:00, not March's last Friday at 24:00. Changes affecting past timestamps Europe/Chisinau observed DST during 1990, and switched from +04 to +03 at 1990-05-06 02:00, instead of switching from +03 to +02. (Thanks to Stepan Golosunov.) 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not KUYT/KUYST. (Thanks to Stepan Golosunov.) Changes to code tzselect's diagnostics and checking, and checktab.awk's checking, have been improved. (Thanks to J William Piggott.) tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) tzselect now tests Julian-date TZ settings more accurately. (Thanks to J William Piggott.) Changes to commentary Comments in zone tables have been improved. (Thanks to J William Piggott.) tzselect again limits its menu comments so that menus fit on a 24×80 alphanumeric display. A new web page tz-how-to.html. (Thanks to Bill Seymour.) In the Theory file, the description of possible time zone abbreviations in tzdata has been cleaned up, as the old description was unclear and inconsistent. (Thanks to Alain Mouette for reporting the problem.) Release 2016a - 2016-01-26 23:28:02 -0800 Changes affecting future timestamps America/Cayman will not observe daylight saving this year after all. Revert our guess that it would. (Thanks to Matt Johnson.) Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. (Thanks to Alexander Krivenyshev.) Asia/Tehran now has DST predictions for the year 2038 and later, to be March 21 00:00 to September 21 00:00. This is likely better than predicting no DST, albeit off by a day every now and then. Changes affecting past and future timestamps America/Metlakatla switched from PST all year to AKST/AKDT on 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) America/Santa_Isabel has been removed, and replaced with a backward compatibility link to America/Tijuana. Its contents were apparently based on a misreading of Mexican legislation. Changes affecting past timestamps Asia/Karachi's two transition times in 2002 were off by a minute. (Thanks to Matt Johnson.) Changes affecting build procedure An installer can now combine leap seconds with use of the backzone file, e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. The old 'make posix_packrat' rule is now marked as obsolescent. (Thanks to Ian Abbott for an initial implementation.) Changes affecting documentation and commentary A new file LICENSE makes it easier to see that the code and data are mostly public-domain. (Thanks to James Knight.) The three non-public-domain files now use the current (3-clause) BSD license instead of older versions of that license. tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section on editing tz source files (with a mention of Sublime zoneinfo, thanks to Gilmore Davidson). The Theory and asia files now mention the 2015 book "The Global Transformation of Time, 1870-1950", and cite a couple of reviews. The America/Chicago entry now documents the informal use of US central time in Fort Pierre, South Dakota. (Thanks to Rick McDermid, Matt Johnson, and Steve Jones.) Release 2015g - 2015-10-01 00:39:51 -0700 Changes affecting future timestamps Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. (Thanks to Fatih.) Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. (Thanks to Alexander Krivenyshev.) Fiji's 2016 fall-back transition is scheduled for January 17, not 24. (Thanks to Ken Rylander.) Fort Nelson, British Columbia will not fall back on 2015-11-01. It has effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. New zone America/Fort_Nelson. (Thanks to Matt Johnson.) Changes affecting past timestamps Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. Changes affecting code localtime no longer mishandles America/Anchorage after 2037. (Thanks to Bradley White for reporting the bug.) On hosts with signed 32-bit time_t, localtime no longer mishandles Pacific/Fiji after 2038-01-16 14:00 UTC. The localtime module allows the variables 'timezone', 'daylight', and 'altzone' to be in common storage shared with other modules, and declares them in case the system does not. (Problems reported by Kees Dekker.) On platforms with tm_zone, strftime.c now assumes it is not NULL. This simplifies the code and is consistent with zdump.c. (Problem reported by Christos Zoulas.) Changes affecting documentation The tzfile man page now documents that transition times denote the starts (not the ends) of the corresponding time periods. (Ambiguity reported by Bill Seymour.) Release 2015f - 2015-08-10 18:06:56 -0700 Changes affecting future timestamps North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) The abbreviation remains "KST". (Thanks to Robert Elz.) Uruguay no longer observes DST. (Thanks to Steffen Thorsen and Pablo Camargo.) Changes affecting past and future timestamps Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. (Thanks to Roman Tudos.) Changes affecting data format and code zic's '-y YEARISTYPE' option is no longer documented. The TYPE field of a Rule line should now be '-'; the old values 'even', 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. Although the implementation has not changed, these features do not work in the default installation, they are not used in the data, and they are now considered obsolescent. zic now checks that two rules don't take effect at the same time. (Thanks to Jon Skeet and Arthur David Olson.) Constraints on simultaneity are now documented. The two characters '%z' in a zone format now stand for the UT offset, e.g., '-07' for seven hours behind UT and '+0530' for five hours and thirty minutes ahead. This better supports time zone abbreviations conforming to POSIX.1-2001 and later. Changes affecting installed data files Comments for America/Halifax and America/Glace_Bay have been improved. (Thanks to Brian Inglis.) Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, Europe/Sofia, and Europe/Tallinn. This yields slightly smaller installed data files for Europe/Simferopol and Europe/Tallinn. It does not affect timestamps. (Thanks to Howard Hinnant.) Changes affecting code zdump and zic no longer warn about valid time zone abbreviations like '-05'. Some Visual Studio 2013 warnings have been suppressed. (Thanks to Kees Dekker.) 'date' no longer sets the time of day and its -a, -d, -n and -t options have been removed. Long obsolescent, the implementation of these features had porting problems. Builders no longer need to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. (Thanks to Kees Dekker for pointing out the problem.) Changes affecting documentation The Theory file mentions naming issues earlier, as these seem to be poorly publicized (thanks to Gilmore Davidson for reporting the problem). tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). Mention that Herbert Samuel introduced the term "Summer Time". Release 2015e - 2015-06-13 10:56:02 -0700 Changes affecting future timestamps Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) Assume Cayman Islands will observe DST starting next year, using US rules. Although it isn't guaranteed, it is the most likely. Changes affecting data format The file 'iso3166.tab' now uses UTF-8, so that its entries can better spell the names of Åland Islands, Côte d'Ivoire, and Réunion. Changes affecting code When displaying data, tzselect converts it to the current locale's encoding if the iconv command works. (Problem reported by random832.) tzselect no longer mishandles Dominica, fixing a bug introduced in Release 2014f. (Problem reported by Owen Leibman.) zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". This fixes a bug introduced in Release 2014f. (Problem reported by Leonardo Chiquitto.) Release 2015d - 2015-04-24 08:09:46 -0700 Changes affecting future timestamps Egypt will not observe DST in 2015 and will consider canceling it permanently. For now, assume no DST indefinitely. (Thanks to Ahmed Nazmy and Tim Parenti.) Changes affecting past timestamps America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 1966-07-01. Also, Yukon's time zone history is documented better. (Thanks to Brian Inglis and Dennis Ferguson.) Change affecting past and future time zone abbreviations The abbreviations for Hawaii-Aleutian standard and daylight times have been changed from HAST/HADT to HST/HDT, as per US Government Printing Office style. This affects only America/Adak since 1983, as America/Honolulu was already using the new style. Changes affecting code zic has some minor performance improvements. Release 2015c - 2015-04-11 08:55:55 -0700 Changes affecting future timestamps Egypt's spring-forward transition is at 24:00 on April's last Thursday, not 00:00 on April's last Friday. 2015's transition will therefore be on Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) Changes affecting past timestamps The following changes affect some pre-1991 Chile-related timestamps in America/Santiago, Antarctica/Palmer, and Pacific/Easter. The 1910 transition was January 10, not January 1. The 1918 transition was September 10, not September 1. The UT -04 time observed from 1932 to 1942 is now considered to be standard time, not year-round DST. Santiago observed DST (UT -03) from 1946-07-15 through 1946-08-31, then reverted to standard time, then switched to -05 on 1947-04-01. Assume transitions before 1968 were at 00:00, since we have no data saying otherwise. The spring 1988 transition was 1988-10-09, not 1988-10-02. The fall 1990 transition was 1990-03-11, not 1990-03-18. Assume no UT offset change for Pacific/Easter on 1890-01-01, and omit all transitions on Pacific/Easter from 1942 through 1946 since we have no data suggesting that they existed. One more zone has been turned into a link, as it differed from an existing zone only for older timestamps. As usual, this change affects UT offsets in pre-1970 timestamps only. The zone's old contents have been moved to the 'backzone' file. The affected zone is America/Montreal. Changes affecting commentary Mention the TZUpdater tool. Mention "The Time Now". (Thanks to Brandon Ramsey.) Release 2015b - 2015-03-19 23:28:11 -0700 Changes affecting future timestamps Mongolia will start observing DST again this year, from the last Saturday in March at 02:00 to the last Saturday in September at 00:00. (Thanks to Ganbold Tsagaankhuu.) Palestine will start DST on March 28, not March 27. Also, correct the fall 2014 transition from September 26 to October 24. Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) Changes affecting past timestamps The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a regression. (Thanks to Stuart Bishop for reporting the problem.) Some more zones have been turned into links, when they differed from existing zones only for older timestamps. As usual, these changes affect UT offsets in pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: America/Antigua, America/Cayman, Pacific/Midway, and Pacific/Saipan. Changes affecting time zone abbreviations Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". (Thanks to Hank W.) Changes affecting code Fix integer overflow bug in reference 'mktime' implementation. (Problem reported by Jörg Richter.) Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries to be used in the same executable as standard-library time_t functions. (Problems reported by Bradley White.) Changes affecting commentary Cite the recent Mexican decree changing Quintana Roo's time zone. (Thanks to Carlos Raúl Perasso.) Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) Update info about Mars time. Release 2015a - 2015-01-29 22:35:20 -0800 Changes affecting future timestamps The Mexican state of Quintana Roo, represented by America/Cancun, will shift from Central Time with DST to Eastern Time without DST on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) Chile will not change clocks in April or thereafter; its new standard time will be its old daylight saving time. This affects America/Santiago, Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. (Thanks to Tim Parenti.) Changes affecting past timestamps Iceland observed DST in 1919 and 1921, and its 1939 fallback transition was Oct. 29, not Nov. 29. Remove incorrect data from Shanks about time in Iceland between 1837 and 1908. Some more zones have been turned into links, when they differed from existing zones only for older timestamps. As usual, these changes affect UT offsets in pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, and Asia/Muscat. Changes affecting code tzalloc now scrubs time zone abbreviations compatibly with the way that tzset always has, by replacing invalid bytes with '_' and by shortening too-long abbreviations. tzselect ports to POSIX awk implementations, no longer mishandles POSIX TZ settings when GNU awk is used, and reports POSIX TZ settings to the user. (Thanks to Stefan Kuhn.) Changes affecting build procedure 'make check' now checks for links to links in the data. One such link (for Africa/Asmera) has been fixed. (Thanks to Stephen Colebourne for pointing out the problem.) Changes affecting commentary The leapseconds file commentary now mentions the expiration date. (Problem reported by Martin Burnicki.) Update Mexican Library of Congress URL. Release 2014j - 2014-11-10 17:37:11 -0800 Changes affecting current and future timestamps Turks & Caicos' switch from US eastern time to UT -04 year-round did not occur on 2014-11-02 at 02:00. It's currently scheduled for 2015-11-01 at 02:00. (Thanks to Chris Walton.) Changes affecting past timestamps Many pre-1989 timestamps have been corrected for Asia/Seoul and Asia/Pyongyang, based on sources for the Korean-language Wikipedia entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no longer guess that Pyongyang mimicked Seoul time after World War II, as this is politically implausible. Some more zones have been turned into links, when they differed from existing zones only for older timestamps. As usual, these changes affect UT offsets in pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: Africa/Addis_Ababa, Africa/Asmara, Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and Indian/Mayotte. Changes affecting commentary The commentary is less enthusiastic about Shanks as a source, and is more careful to distinguish UT from UTC. Release 2014i - 2014-10-21 22:04:57 -0700 Changes affecting future timestamps Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. (Thanks to Ken Rylander for the heads-up.) Guess that future years will use a similar pattern. A new Zone Pacific/Bougainville, for the part of Papua New Guinea that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. (Thanks to Kiley Walbom for the heads-up.) Changes affecting time zone abbreviations Since Belarus is not changing its clocks even though Moscow is, the time zone abbreviation in Europe/Minsk is changing from FET to its more-traditional value MSK on 2014-10-26 at 01:00. (Thanks to Alexander Bokovoy for the heads-up about Belarus.) The new abbreviation IDT stands for the pre-1976 use of UT +08 in Indochina, to distinguish it better from ICT (+07). Changes affecting past timestamps Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's authoritative book). Asia/Ho_Chi_Minh has been added to zone1970.tab, to give tzselect users in Vietnam two choices, since north and south Vietnam disagreed after our 1970 cutoff. Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as they differed from existing zones only for older timestamps. As usual, these changes affect pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. Changes affecting code The time-related library functions now set errno on failure, and some crashes in the new tzalloc-related library functions have been fixed. (Thanks to Christos Zoulas for reporting most of these problems and for suggesting fixes.) If USG_COMPAT is defined and the requested timestamp is standard time, the tz library's localtime and mktime functions now set the extern variable timezone to a value appropriate for that timestamp; and similarly for ALTZONE, daylight saving time, and the altzone variable. This change is a companion to the tzname change in 2014h, and is designed to make timezone and altzone more compatible with tzname. The tz library's functions now set errno to EOVERFLOW if they fail because the result cannot be represented. ctime and ctime_r now return NULL and set errno when a timestamp is out of range, rather than having undefined behavior. Some bugs associated with the new 2014g functions have been fixed. This includes a bug that largely incapacitated the new functions time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) It also includes some uses of uninitialized variables after tzalloc. The new code uses the standard type 'ssize_t', which the Makefile now gives porting advice about. Changes affecting commentary Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). Release 2014h - 2014-09-25 18:59:03 -0700 Changes affecting past timestamps America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, not 1920-01-06. The old entry was based on a misinterpretation of Shanks. Some more zones have been turned into links, when they differed from existing zones only for older timestamps. As usual, these changes affect UT offsets in pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: Africa/Blantyre, Africa/Bujumbura, Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. Changes affecting code zdump -V and -v now output gmtoff= values on all platforms, not merely on platforms defining TM_GMTOFF. The tz library's localtime and mktime functions now set tzname to a value appropriate for the requested timestamp, and zdump now uses this on platforms not defining TM_ZONE, fixing a 2014g regression. (Thanks to Tim Parenti for reporting the problem.) The tz library no longer sets tzname if localtime or mktime fails. zdump -c no longer mishandles transitions near year boundaries. (Thanks to Tim Parenti for reporting the problem.) An access to uninitialized data has been fixed. (Thanks to Jörg Richter for reporting the problem.) When THREAD_SAFE is defined, the code ports to the C11 memory model. A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined and two threads race to initialize data used by gmtime-like functions. (Thanks to Andy Heninger for reporting the problems.) Changes affecting build procedure 'make check' now checks better for properly-sorted data. Changes affecting documentation and commentary zdump's gmtoff=N output is now documented, and its isdst=D output is now documented to possibly output D values other than 0 or 1. zdump -c's treatment of years is now documented to use the Gregorian calendar and Universal Time without leap seconds, and its behavior at cutoff boundaries is now documented better. (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) Programs are now documented to use the proleptic Gregorian calendar. (Thanks to Alan Barrett for the suggestion.) Fractional-second GMT offsets have been documented for civil time in 19th-century Chennai, Jakarta, and New York. Release 2014g - 2014-08-28 12:31:23 -0700 Changes affecting future timestamps Turks & Caicos is switching from US eastern time to UT -04 year-round, modeled as a switch on 2014-11-02 at 02:00. [As noted in 2014j, this switch was later delayed.] Changes affecting past timestamps Time in Russia or the USSR before 1926 or so has been corrected by a few seconds in the following zones: Asia/Irkutsk, Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For Asia/Yekaterinburg the correction is a few minutes. (Thanks to Vladimir Karpinsky.) The Portuguese decree of 1911-05-26 took effect on 1912-01-01. This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. (Thanks to Stephen Colebourne for pointing to the decree.) Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. A new file 'backzone' contains data which may appeal to connoisseurs of old timestamps, although it is out of scope for the tz database, is often poorly sourced, and contains some data that is known to be incorrect. The new file is not recommended for ordinary use and its entries are not installed by default. (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and Isle of Man entries.) Some more zones have been turned into links, when they differed from existing zones only for older timestamps. As usual, these changes affect UT offsets in pre-1970 timestamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: Africa/Bangui, Africa/Brazzaville, Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. Changes affecting code Unless NETBSD_INSPIRED is defined to 0, the tz library now supplies functions for creating and using objects that represent timezones. The new functions are tzalloc, tzfree, localtime_rz, mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and time2posix_z. They are intended for performance: for example, localtime_rz (unlike localtime_r) is trivially thread-safe without locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired functions, and to Alan Barrett and Jonathan Lennox for helping to debug the change.) zdump now builds with the tz library unless USE_LTZ is defined to 0, This lets zdump use tz features even if the system library lacks them. To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. zdump now uses localtime_rz if available, as it's significantly faster, and it can help zdump better diagnose invalid timezone names. Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is not available, zdump now uses localtime_r and tzset if available, as this is a bit cleaner and faster than plain localtime. Compile with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system lacks these two functions. If THREAD_SAFE is defined to 1, the tz library is now thread-safe. Although not needed for tz's own applications, which are single-threaded, this supports POSIX better if the tz library is used in multithreaded apps. Some crashes have been fixed when zdump or the tz library is given invalid or outlandish input. The tz library no longer mishandles leap seconds on platforms with unsigned time_t in timezones that lack ordinary transitions after 1970. The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not already defined, to make it easier to configure on common platforms. Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. Unless the new macro UNINIT_TRAP is defined to 1, the tz code now assumes that reading uninitialized memory yields garbage values but does not cause other problems such as traps. If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now more likely to guess right for ambiguous timestamps near transitions where tm_isdst does not change. If HAVE_STRFTIME_L is defined to 1, the tz library now defines strftime_l for compatibility with recent versions of POSIX. Only the C locale is supported, though. HAVE_STRFTIME_L defaults to 1 on recent POSIX versions, and to 0 otherwise. tzselect -c now uses a hybrid distance measure that works better in Africa. (Thanks to Alan Barrett for noting the problem.) The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, or when time_tz is defined. When HAVE_UTMPX_H is set the 'date' command now builds on systems whose file does not define WTMPX_FILE, and when setting the date it updates the wtmpx file if _PATH_WTMPX is defined. This affects GNU/Linux and similar systems. For easier maintenance later, some C code has been simplified, some lint has been removed, and the code has been tweaked so that plain 'make' is more likely to work. The C type 'bool' is now used for boolean values, instead of 'int'. The long-obsolete LOCALE_HOME code has been removed. The long-obsolete 'gtime' function has been removed. Changes affecting build procedure 'zdump' no longer links in ialloc.o, as it's not needed. 'make check_time_t_alternatives' no longer assumes GNU diff. Changes affecting distribution tarballs The files checktab.awk and zoneinfo2tdf.pl are now distributed in the tzdata tarball instead of the tzcode tarball, since they help maintain the data. The NEWS and Theory files are now also distributed in the tzdata tarball, as they're relevant for data. (Thanks to Alan Barrett for pointing this out.) Also, the leapseconds.awk file is no longer distributed in the tzcode tarball, since it belongs in the tzdata tarball (where 2014f inadvertently also distributed it). Changes affecting documentation and commentary A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms for debugging it.) The man pages have been updated to use function prototypes, to document thread-safe variants like localtime_r, and to document the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and mktime_z. The fields in Link lines have been renamed to be more descriptive and more like the parameters of 'ln'. LINK-FROM has become TARGET, and LINK-TO has become LINK-NAME. tz-link.htm mentions the IETF's tzdist working group; Windows Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. Some broken URLs have been fixed in the commentary. (Thanks to Lester Caine.) Commentary about Philippines DST has been updated, and commentary on pre-1970 time in India has been added. Release 2014f - 2014-08-05 17:42:36 -0700 Changes affecting future timestamps Russia will subtract an hour from most of its time zones on 2014-10-26 at 02:00 local time. (Thanks to Alexander Krivenyshev.) There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic (Europe/Samara) are not changing their clocks. The changed zones are Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, but not its UTC offset. Two zones are added: Asia/Chita (split from Asia/Yakutsk, and also with two hours subtracted) and Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour subtracted). (Thanks to Tim Parenti for much of the above.) Changes affecting time zone abbreviations Australian eastern time zone abbreviations are now AEST/AEDT not EST, and similarly for the other Australian zones. That is, for eastern standard and daylight saving time the abbreviations are AEST and AEDT instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, and AWST/AWDT are now used instead of the former CST, CWST, and WST. This change does not affect UT offsets, only time zone abbreviations. (Thanks to Rich Tibbett and many others.) Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) effective 2014-10-26 at 02:00 local time. The time zone abbreviation for Xinjiang Time (observed in Ürümqi) has been changed from URUT to XJT. (Thanks to Luther Ma.) Prefer MSK/MSD for Moscow time in Russia, even in other cities. Similarly, prefer EET/EEST for eastern European time in Russia. Change time zone abbreviations in (western) Samoa to use "ST" and "DT" suffixes, as this is more likely to match common practice. Prefix "W" to (western) Samoa time when its standard-time offset disagrees with that of American Samoa. America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. Time zone abbreviations have been updated for Japan's two time zones used 1896-1937. JWST now stands for Western Standard Time, and JCST for Central Standard Time (formerly this was CJT). These abbreviations are now used for time in Korea, Taiwan, and Sakhalin while controlled by Japan. Changes affecting past timestamps China's five zones have been simplified to two, since the post-1970 differences in the other three seem to have been imaginary. The zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been removed; backwards-compatibility links still work, albeit with different behaviors for timestamps before May 1980. Asia/Urumqi's 1980 transition to UT +08 has been removed, so that it is now at +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; Treindl sent helpful translations of two papers by Guo Qingsheng.) Some zones have been turned into links, when they differed from existing zones only for older UT offsets where data entries were likely invented. These changes affect UT offsets in pre-1970 timestamps only. This is similar to the change in release 2013e, except this time for western Africa. The affected zones are: Africa/Bamako, Africa/Banjul, Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and Atlantic/St_Helena. This also affects the backwards-compatibility link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, Tim Parenti, and David Patte for reporting problems in earlier versions of this change.) Asia/Shanghai's pre-standard-time UT offset has been changed from 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its transition to standard time has been changed from 1928 to 1901. Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. In 1946 it observed DST from 05-15 through 09-30; in 1947 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. (Thanks to Yu-Cheng Chuang.) Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 10-03 at 00:00. (Thanks to Konstantin Hyppönen.) Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the period from 1911 to 1950. Pacific/Chatham has been changed to New Zealand standard time plus 45 minutes for the period before 1957, reflecting a 1956 remark in the New Zealand parliament. Europe/Budapest has several pre-1946 corrections: in 1918 the transition out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 not 04-06 at 02:00; and there was no DST in 1920. Africa/Accra is now assumed to have observed DST from 1920 through 1935. Time in Russia before 1927 or so has been corrected by a few seconds in the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) Changes affecting data format A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. The new file's extended format allows multiple country codes per zone. The older file is still installed but is deprecated; its format is not changing and it will still be distributed for a while, but new applications should use the new file. The new file format simplifies maintenance of obscure locations. To test this, it adds coverage for the Crozet Islands and the Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. It is still ASCII now, but commentary about the switch has been added. The new file 'zone1970.tab' already uses UTF-8. Changes affecting code 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE is defined. (Thanks to Elliott Hughes for reporting the problem.) 'zic' no longer mishandles input when ignoring case in locales that are not compatible with English, e.g., unibyte Turkish locales when compiled with HAVE_GETTEXT. Error diagnostics of 'zic' and 'yearistype' have been reworded so that they no longer use ASCII '-' as if it were a dash. 'zic' now rejects output file names that contain '.' or '..' components. (Thanks to Tim Parenti for reporting the problem.) 'zic -v' now warns about output file names that do not follow POSIX rules, or that contain a digit or '.'. (Thanks to Arthur David Olson for starting the ball rolling on this.) Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. Changes affecting build procedure 'zic' no longer links in localtime.o and asctime.o, as they're not needed. (Thanks to John Cochran.) Changes affecting documentation and commentary The 'Theory' file documents legacy names, the longstanding exceptions to the POSIX-inspired file name rules. The 'zic' documentation clarifies the role of time types when interpreting dates. (Thanks to Arthur David Olson.) Documentation and commentary now prefer UTF-8 to US-ASCII, allowing the use of proper accents in foreign words and names. Code and data have not changed because of this. (Thanks to Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug this.) Non-HTML documentation and commentary now use plain-text URLs instead of HTML insertions, and are more consistent about bracketing URLs when they are not already surrounded by white space. (Thanks to suggestions by Steffen Nurpmeso.) There is new commentary about Xujiahui Observatory, the five time-zone project in China from 1918 to 1949, timekeeping in Japanese-occupied Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the warlord Jin Shuren in the data. Commentary about the coverage of each Russian zone has been standardized. (Thanks to Tim Parenti.) There is new commentary about contemporary timekeeping in Ethiopia. Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. There is new commentary about time in Poland in 1919. Proper credit has been given to DST inventor George Vernon Hudson. Commentary about time in Metlakatla, AK and Resolute, NU has been improved, with a new source for the former. In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it is uninhabited. Commentary about permanent Antarctic bases has been updated. Several typos have been corrected. (Thanks to Tim Parenti for contributing some of these fixes.) tz-link.htm now mentions the JavaScript libraries Moment Timezone, TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up from Matt Johnson.) Also, it mentions the Go 'latlong' package. (Thanks to a heads-up from Dirkjan Ochtman.) The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 have been removed. These obsolescent US Naval Observatory entries were no longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) Release 2014e - 2014-06-12 21:53:52 -0700 Changes affecting near-future timestamps Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily switch to standard time at 24:00 the last Thursday before Ramadan, and back to DST at 00:00 the first Friday after Ramadan. Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks to Milamber Space Network.) Guess that from 2015 on Morocco will temporarily switch to standard time at 03:00 the last Saturday before Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. Changes affecting past timestamps The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of "MSD" for Moscow's double daylight time in summer 1921. Also, a typo "VLASST" has been repaired to be "VLAST" for Vladivostok summer time in 1991. (Thanks to Hank W. for reporting the problems.) Changes affecting commentary tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and removes stale pointers to World Time Explorer and WORLDTIME. Release 2014d - 2014-05-27 21:34:40 -0700 Changes affecting code zic no longer generates files containing timestamps before the Big Bang. This works around GNOME glib bug 878 (Thanks to Leonardo Chiquitto for reporting the bug, and to Arthur David Olson and James Cloos for suggesting improvements to the fix.) Changes affecting documentation tz-link.htm now mentions GNOME. Release 2014c - 2014-05-13 07:44:13 -0700 Changes affecting near-future timestamps Egypt observes DST starting 2014-05-15 at 24:00. (Thanks to Ahmad El-Dardiry and Gunther Vermier.) Details have not been announced, except that DST will not be observed during Ramadan. Guess that DST will stop during the same Ramadan dates as Morocco, and that Egypt's future spring and fall transitions will be the same as 2010 when it last observed DST, namely April's last Friday at 00:00 to September's last Thursday at 23:00 standard time. Also, guess that Ramadan transitions will be at 00:00 standard time. Changes affecting code zic now generates transitions for minimum time values, eliminating guesswork when handling low-valued timestamps. (Thanks to Arthur David Olson.) Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) Changes affecting commentary and documentation Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) Release 2014b - 2014-03-24 21:28:50 -0700 Changes affecting near-future timestamps Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and Bengt-Inge Larsson.) This is currently an approximation; a better version will require the zic and localtime fixes mentioned below, and the plan is to wait for a while until at least the zic fixes propagate. Changes affecting code 'zic' and 'localtime' no longer reject locations needing four transitions per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) Also, 'zic' avoids some unlikely failures due to integer overflow. Changes affecting build procedure 'make check' now detects Rule lines defined but never used. The NZAQ rules, an instance of this problem, have been removed. Changes affecting commentary and documentation Fix Tuesday/Thursday typo in description of time in Israel. (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) Microsoft Windows 8.1 doesn't support tz database names. (Thanks to Donald MacQueen.) Instead, the Microsoft Windows Store app library supports them. Add comments about Johnston Island time in the 1960s. (Thanks to Lyle McElhaney.) Morocco's 2014 DST start will be as predicted. (Thanks to Sebastien Willemijns.) Release 2014a - 2014-03-07 23:30:29 -0800 Changes affecting near-future timestamps Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for the heads-up, and to Tim Parenti for simplifying the update.) Changes affecting past timestamps Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. (Thanks to Steffen Thorsen.) Ukraine switched from Moscow to Eastern European time on 1990-07-01 (not 1992-01-01), and observed DST during the entire next winter. (Thanks to Vladimir in Moscow via Alois Treindl.) In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. (Thanks to Avigdor Finkelstein.) Changes affecting code A uninitialized-storage bug in 'localtime' has been fixed. (Thanks to Logan Chien.) Changes affecting the build procedure The settings for 'make check_web' now default to Ubuntu 13.10. Changes affecting commentary and documentation The boundary of the US Pacific time zone is given more accurately. (Thanks to Alan Mintz.) Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.) Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.) Better descriptions of countries with same time zone history as Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) Several changes affect tz-link.htm, the main web page. Mention Time.is (thanks to Even Scharning) and WX-now (thanks to David Braverman). Mention xCal (Internet RFC 6321) and jCal. Microsoft has some support for tz database names. CLDR data formats include both XML and JSON. Mention Maggiolo's map of solar vs standard time. (Thanks to Arthur David Olson.) Mention TZ4Net. (Thanks to Matt Johnson.) Mention the timezone-olson Haskell package. Mention zeitverschiebung.net. (Thanks to Martin Jäger.) Remove moribund links to daylight-savings-time.info and to Simple Timer + Clocks. Update two links. (Thanks to Oscar van Vlijmen.) Fix some formatting glitches, e.g., remove random newlines from abbr elements' title attributes. Release 2013i - 2013-12-17 07:25:23 -0800 Changes affecting near-future timestamps: Jordan switches back to standard time at 00:00 on December 20, 2013. The 2006-2011 transition schedule is planned to resume in 2014. (Thanks to Steffen Thorsen.) Changes affecting past timestamps: In 2004, Cuba began DST on March 28, not April 4. (Thanks to Steffen Thorsen.) Changes affecting code The compile-time flag NOSOLAR has been removed, as nowadays the benefit of slightly shrinking runtime table size is outweighed by the cost of disallowing potential future updates that exceed old limits. Changes affecting documentation and commentary The files solar87, solar88, and solar89 are no longer distributed. They were a negative experiment - that is, a demonstration that tz data can represent solar time only with some difficulty and error. Their presence in the distribution caused confusion, as Riyadh civil time was generally not solar time in those years. tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) Release 2013h - 2013-10-25 15:32:32 -0700 Changes affecting current and future timestamps: Libya has switched its UT offset back to +02 without DST, instead of +01 with DST. (Thanks to Even Scharning.) Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. (Thanks to Gwillim Law.) Changes affecting future timestamps: Acre and (we guess) western Amazonas will switch from UT -04 to -05 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. (Thanks to Steffen Thorsen.) Add entries for DST transitions in Morocco in the year 2038. This avoids some year-2038 glitches introduced in 2013g. (Thanks to Yoshito Umaoka for reporting the problem.) Changes affecting API The 'tzselect' command no longer requires the 'select' command, and should now work with /bin/sh on more platforms. It also works around a bug in BusyBox awk before version 1.21.0. (Thanks to Patrick 'P. J.' McDermott and Alan Barrett.) Changes affecting code Fix localtime overflow bugs with 32-bit unsigned time_t. zdump no longer assumes sscanf returns maximal values on overflow. Changes affecting the build procedure The builder can specify which programs to use, if any, instead of 'ar' and 'ranlib', and libtz.a is now built locally before being installed. (Thanks to Michael Forney.) A dependency typo in the 'zdump' rule has been fixed. (Thanks to Andrew Paprocki.) The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' work as specified by POSIX.2-1992 or later; this is portable nowadays. 'make clean' no longer removes 'leapseconds', since it's host-independent and is part of the distribution. The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. Changes affecting documentation and commentary tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). Update URLs in tz-link page. Add URLs for Microsoft Windows, since 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no longer maintained) and for old advisories. SOFA now does C. Release 2013g - 2013-09-30 21:08:26 -0700 Changes affecting current and near-future timestamps Morocco now observes DST from the last Sunday in March to the last Sunday in October, not April to September respectively. (Thanks to Steffen Thorsen.) Changes affecting 'zic' 'zic' now runs on platforms that lack both hard links and symlinks. (Thanks to Theo Veenker for reporting the problem, for MinGW.) Also, fix some bugs on platforms that lack hard links but have symlinks. 'zic -v' again warns that Asia/Tehran has no POSIX environment variable to predict the far future, fixing a bug introduced in 2013e. Changes affecting the build procedure The 'leapseconds' file is again put into the tzdata tarball. Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to Matt Burgess and Ian Abbott.) The timestamps of these and other dependent files in tarballs are adjusted more consistently. Changes affecting documentation and commentary The README file is now part of the data tarball as well as the code. It now states that files are public domain unless otherwise specified. (Thanks to Andrew Main (Zefram) for asking for clarifications.) Its details about the 1989 release moved to a place of honor near the end of NEWS. Release 2013f - 2013-09-24 23:37:36 -0700 Changes affecting near-future timestamps Tocantins will very likely not observe DST starting this spring. (Thanks to Steffen Thorsen.) Jordan will likely stay at UT +03 indefinitely, and will not fall back this fall. Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) Changes affecting API The types of the global variables 'timezone' and 'altzone' (if present) have been changed back to 'long'. This is required for 'timezone' by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. These variables were originally 'long' in the tz code, but were mistakenly changed to 'time_t' in 1987; nobody reported the incompatibility until now. The difference matters on x32, where 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) Changes affecting the build procedure Avoid long strings in leapseconds.awk to work around a mawk bug. (Thanks to Cyril Baurand.) Changes affecting documentation and commentary New file 'NEWS' that contains release notes like this one. Paraguay's law does not specify DST transition time; 00:00 is customary. (Thanks to Waldemar Villamayor-Venialbo.) Minor capitalization fixes. Changes affecting version-control only The experimental GitHub repository now contains annotated and signed tags for recent releases, e.g., '2013e' for Release 2013e. Releases are tagged starting with 2012e; earlier releases were done differently, and tags would either not have a simple name or not exactly match what was released. 'make set-timestamps' is now simpler and a bit more portable. Release 2013e - 2013-09-19 23:50:04 -0700 Changes affecting near-future timestamps This year Fiji will start DST on October 27, not October 20. (Thanks to David Wheeler for the heads-up.) For now, guess that Fiji will continue to spring forward the Sunday before the fourth Monday in October. Changes affecting current and future time zone abbreviations Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian time zone abbreviations since 1932. (Thanks to George Ziegler, Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, Asia/Makassar, and Asia/Pontianak. Use ART (UT -03, standard time), rather than WARST (also -03, but daylight saving time) for San Luis, Argentina since 2009. Changes affecting Godthåb timestamps after 2037 if version mismatch Allow POSIX-like TZ strings where the transition time's hour can range from -167 through 167, instead of the POSIX-required 0 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the new Fiji rules. This is a more-compact way to represent far-future timestamps for America/Godthab, America/Santiago, Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by this change. (Derived from a suggestion by Arthur David Olson.) Allow POSIX-like TZ strings where daylight saving time is in effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western Argentina Summer Time all year. This supports a more-compact way to represent the 2013d data for America/Argentina/San_Luis. Because of the change for San Luis noted above this change does not affect the current data. (Thanks to Andrew Main (Zefram) for suggestions that improved this change.) Where these two TZ changes take effect, there is a minor extension to the tz file format in that it allows new values for the embedded TZ-format string, and the tz file format version number has therefore been increased from 2 to 3 as a precaution. Version-2-based client code should continue to work as before for all timestamps before 2038. Existing version-2-based client code (tzcode, GNU/Linux, Solaris) has been tested on version-3-format files, and typically works in practice even for timestamps after 2037; the only known exception is America/Godthab. Changes affecting timestamps before 1970 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects some errors before 1947. Some zones have been turned into links, when they differ from existing zones only in older data entries that were likely invented or that differ only in LMT or transitions from LMT. These changes affect only timestamps before 1943. The affected zones are: Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, America/Grenada, America/Guadeloupe, America/Marigot, America/Montserrat, America/St_Barthelemy, America/St_Kitts, America/St_Lucia, America/St_Thomas, America/St_Vincent, America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for confirming that the old Europe/Vaduz zone was wrong and the new link is better for WWII-era times.) Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects America/Cayman, America/Jamaica and America/Grand_Turk timestamps from 1890 to 1912. Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks to Alois Treindl.) Change the date of the circa-1850 Zurich transition from 1849-09-12 to 1853-07-16, overriding Shanks with data from Messerli about postal and telegraph time in Switzerland. Changes affecting time zone abbreviations before 1970 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, as Jakarta was called Batavia back then. Changes affecting API The 'zic' command now outputs a dummy transition when far-future data can't be summarized using a TZ string, and uses a 402-year window rather than a 400-year window. For the current data, this affects only the Asia/Tehran file. It does not affect any of the timestamps that this file represents, so zdump outputs the same information as before. (Thanks to Andrew Main (Zefram).) The 'date' command has a new '-r' option, which lets you specify the integer time to display, a la FreeBSD. The 'tzselect' command has two new options '-c' and '-n', which lets you select a zone based on latitude and longitude. The 'zic' command's '-v' option now warns about constructs that require the new version-3 binary file format. (Thanks to Arthur David Olson for the suggestion.) Support for floating-point time_t has been removed. It was always dicey, and POSIX no longer requires it. (Thanks to Eric Blake for suggesting to the POSIX committee to remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy Heninger, Arthur David Olson, and Alois Treindl, for reporting bugs and elucidating some of the corners of the old floating-point implementation.) The signatures of 'offtime', 'timeoff', and 'gtime' have been changed back to the old practice of using 'long' to represent UT offsets. This had been inadvertently and mistakenly changed to 'int_fast32_t'. (Thanks to Christos Zoulas.) The code avoids undefined behavior on integer overflow in some more places, including gmtime, localtime, mktime and zdump. Changes affecting the zdump utility zdump now outputs "UT" when referring to Universal Time, not "UTC". "UTC" does not make sense for timestamps that predate the introduction of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen for clarifying UT vs UTC.) Data changes affecting behavior of tzselect and similar programs Country code BQ is now called the more-common name "Caribbean Netherlands" rather than the more-official "Bonaire, St Eustatius & Saba". Remove from zone.tab the names America/Montreal, America/Shiprock, and Antarctica/South_Pole, as they are equivalent to existing same-country-code zones for post-1970 timestamps. The data entries for these names are unchanged, so the names continue to work as before. Changes affecting code internals zic -c now runs way faster on 64-bit hosts when given large numbers. zic now uses vfprintf to avoid allocating and freeing some memory. tzselect now computes the list of continents from the data, rather than have it hard-coded. Minor changes pacify GCC 4.7.3 and GCC 4.8.1. Changes affecting the build procedure The 'leapseconds' file is now generated automatically from a new file 'leap-seconds.list', which is a copy of A new source file 'leapseconds.awk' implements this. The goal is simplification of the future maintenance of 'leapseconds'. When building the 'posix' or 'right' subdirectories, if the subdirectory would be a copy of the default subdirectory, it is now made a symbolic link if that is supported. This saves about 2 MB of file system space. The links America/Shiprock and Antarctica/South_Pole have been moved to the 'backward' file. This affects only nondefault builds that omit 'backward'. Changes affecting version-control only .gitignore now ignores 'date'. Changes affecting documentation and commentary Changes to the 'tzfile' man page It now mentions that the binary file format may be extended in future versions by appending data. It now refers to the 'zdump' and 'zic' man pages. Changes to the 'zic' man page It lists conditions that elicit a warning with '-v'. It says that the behavior is unspecified when duplicate names are given, or if the source of one link is the target of another. Its examples are updated to match the latest data. The definition of white space has been clarified slightly. (Thanks to Michael Deckers.) Changes to the 'Theory' file There is a new section about the accuracy of the tz database, describing the many ways that errors can creep in, and explaining why so many of the pre-1970 timestamps are wrong or misleading (thanks to Steve Allen, Lester Caine, and Garrett Wollman for discussions that contributed to this). The 'Theory' file describes LMT better (this follows a suggestion by Guy Harris). It refers to the 2013 edition of POSIX rather than the 2004 edition. It's mentioned that excluding 'backward' should not affect the other data, and it suggests at least one zone.tab name per inhabited country (thanks to Stephen Colebourne). Some longstanding restrictions on names are documented, e.g., 'America/New_York' precludes 'America/New_York/Bronx'. It gives more reasons for the 1970 cutoff. It now mentions which time_t variants are supported, such as signed integer time_t. (Thanks to Paul Goyette for reporting typos in an experimental version of this change.) (Thanks to Philip Newton for correcting typos in these changes.) Documentation and commentary is more careful to distinguish UT in general from UTC in particular. (Thanks to Steve Allen.) Add a better source for the Zurich 1894 transition. (Thanks to Pierre-Yves Berger.) Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) Release 2013d - 2013-07-05 07:38:01 -0700 Changes affecting future timestamps: Morocco's midsummer transitions this year are July 7 and August 10, not July 9 and August 8. (Thanks to Andrew Paprocki.) Israel now falls back on the last Sunday of October. (Thanks to Ephraim Silverberg.) Changes affecting past timestamps: Specify Jerusalem's location more precisely; this changes the pre-1880 times by 2 s. Changing affecting metadata only: Fix typos in the entries for country codes BQ and SX. Changes affecting code: Rework the code to fix a bug with handling Australia/Macquarie on 32-bit hosts (thanks to Arthur David Olson). Port to platforms like NetBSD, where time_t can be wider than long. Add support for testing time_t types other than the system's. Run 'make check_time_t_alternatives' to try this out. Currently, the tests fail for unsigned time_t; this should get fixed at some point. Changes affecting documentation and commentary: Deemphasize the significance of national borders. Update the zdump man page. Remove obsolete NOID comment (thanks to Denis Excoffier). Update several URLs and comments in the web pages. Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). Release 2013c - 2013-04-19 16:17:40 -0700 Changes affecting current and future timestamps: Palestine observed DST starting March 29, 2013. (Thanks to Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, with the predicted rules being the last Thursday in March at 24:00 to the first Friday on or after September 21 at 01:00. Assume that the recent change to Paraguay's DST rules is permanent, by moving the end of DST to the 4th Sunday in March every year. (Thanks to Carlos Raúl Perasso.) Changes affecting past timestamps: Fix some historical data for Palestine to agree with that of timeanddate.com, as follows: The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 00:00 Apr 1. The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 02:00. The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. Fix times of habitation for Macquarie to agree with the Tasmania Parks & Wildlife Service history, which indicates that permanent habitation was 1899-1919 and 1948 on. Changing affecting metadata only: Macquarie Island is politically part of Australia, not Antarctica. (Thanks to Tobias Conradi.) Sort Macquarie more-consistently with other parts of Australia. (Thanks to Tim Parenti.) Release 2013b - 2013-03-10 22:33:40 -0700 Changes affecting current and future timestamps: Haiti uses US daylight-saving rules this year, and presumably future years. This changes timestamps starting today. (Thanks to Steffen Thorsen.) Paraguay will end DST on March 24 this year. (Thanks to Steffen Thorsen.) For now, assume it's just this year. Morocco does not observe DST during Ramadan; try to predict Ramadan in Morocco as best we can. (Thanks to Erik Homoet for the heads-up.) Changes affecting commentary: Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. Update URL for Solaris. Mention Internet RFC 6557. Update Internet RFCs 2445->5545, 2822->5322. Switch from FTP to HTTP for Internet RFCs. Release 2013a - 2013-02-27 09:20:35 -0800 Change affecting binary data format: The zone offset at the end of version-2-format zone files is now allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) Changes affecting current and future timestamps: Chile's 2013 rules, and we guess rules for 2014 and later, will be the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. (Thanks to Steffen Thorsen and Robert Elz.) New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. (Thanks to Tobias Conradi and Arthur David Olson.) Many changes affect historical timestamps before 1940. These were deduced from: Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 . Changes affecting the code: Fix zic bug that mishandled Egypt's 2010 changes (this also affected the data). (Thanks to Arthur David Olson.) Fix localtime bug when time_t is unsigned and data files were generated by a signed time_t system. (Thanks to Doug Bailey for reporting and to Arthur David Olson for fixing.) Allow the email address for bug reports to be set by the packager. The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.) Update HTML checking to be compatible with Ubuntu 12.10. Check that files are a safe subset of ASCII. At some point we may relax this requirement to a safe subset of UTF-8. Without the check, some non-UTF-8 encodings were leaking into the distribution. Commentary changes: Restore a comment about copyright notices that was inadvertently deleted. (Thanks to Arthur David Olson.) Improve the commentary about which districts observe what times in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) Add web page links to tz.js. Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) Release 2012j - 2012-11-12 18:34:49 -0800 Libya moved to CET this weekend, but with DST planned next year. (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) Signatures now have the extension .asc, not .sign, as that's more standard. (Thanks to Phil Pennock.) The output of 'zdump --version', and of 'zic --version', now uses a format that is more typical for --version. (Thanks to Joseph S. Myers.) The output of 'tzselect --help', 'zdump --help', and 'zic --help' now uses tz@iana.org rather than the old elsie address. zic -v now complains about abbreviations that are less than 3 or more than 6 characters, as per Posix. Formerly, it checked for abbreviations that were more than 3. 'make public' no longer puts its temporary directory under /tmp, and uses the just-built zic rather than the system zic. Various fixes to documentation and commentary. Release 2012i - 2012-11-03 12:57:09 -0700 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) Linker flags can now be specified via LDFLAGS. AWK now defaults to 'awk', not 'nawk'. The shell in tzselect now defaults to /bin/bash, but this can be overridden by specifying KSHELL. The main web page now mentions the unofficial GitHub repository. (Thanks to Mike Frysinger.) Tarball signatures can now be built by running 'make signatures'. There are also new makefile rules 'tarballs', 'check_public', and separate makefile rules for each tarball and signature file. A few makefile rules are now more portable to strict POSIX. The main web page now lists the canonical IANA URL. Release 2012h - 2012-10-26 22:49:10 -0700 Bahia no longer has DST. (Thanks to Kelley Cook.) Tocantins has DST. (Thanks to Rodrigo Severo.) Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) Web page updates. More C modernization, except that at Arthur David Olson's suggestion the instances of 'register' were kept. Release 2012g - 2012-10-17 20:59:45 -0700 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) Palestine fall 2012. (Thanks to Steffen Thorsen.) Assume C89. To attack the version-number problem, this release ships the file 'Makefile' (which contains the release number) in both the tzcode and the tzdata tarballs. The two Makefiles are identical, and should be identical in any matching pair of tarballs, so it shouldn't matter which order you extract the tarballs. Perhaps we can come up with a better version-number scheme at some point; this scheme does have the virtue of not adding more files. Release 2012f - 2012-09-12 23:17:03 -0700 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 20 this year. (Thanks to Steffen Thorsen.) Release 2012e - 2012-08-02 20:44:55 -0700 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. (Thanks to Steffen Thorsen.) * Use a single version number for both code and data. * .gitignore: New file. * Remove trailing white space. Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 Changes for Morocco's timestamps, which take effect in a couple of hours, along with infrastructure changes to accommodate how the tz code and data are released on IANA. Release data2012c - 2012-03-27 12:17:25 -0400 africa Summer time changes for Morocco (to start late April 2012) asia Changes for 2012 for Gaza & the West Bank (Hebron) and Syria northamerica Haiti following US/Canada rules for 2012 (and we're assuming, for now anyway, for the future). Release 2012b - 2012-03-02 12:29:15 +0700 There is just one change to tzcode2012b (compared with 2012a): the Makefile that was accidentally included with 2012a has been replaced with the version that should have been there, which is identical with the previous version (from tzcode2011i). There are just two changes in tzdata2012b compared with 2012a. Most significantly, summer time in Cuba has been delayed 3 weeks (now starts April 1 rather than March 11). Since Mar 11 (the old start date, as listed in 2012a) is just a little over a week away, this change is urgent. Less importantly, an excess tab in one of the changes in zone.tab in 2012a has been removed. Release 2012a - 2012-03-01 18:28:10 +0700 The changes in tzcode2012a (compared to the previous version, 2011i) are entirely to the README and tz-art.htm and tz-link.htm files, if none of those concern you, you can ignore the code update. The changes reflect the changed addresses for the mailing list and the code and data distribution points & methods (and a link to DateTime::TimeZone::Tzfile has been added to tz-link.htm). In tzdata2012a (compared to the previous release, which was 2011n) the major changes are: Chile 2011/2012 and 2012/2013 summer time date adjustments. Falkland Islands onto permanent summer time (we're assuming for the foreseeable future, though 2012 is all we're fairly certain of.) Armenia has abolished Summer Time. Tokelau jumped the International Date Line back last December (just the same as their near neighbour, Samoa). America/Creston is a new zone for a small area of British Columbia There will be a leapsecond 2012-06-30 23:59:60 UTC. Other minor changes are: Corrections to 1918 Canadian summer time end dates. Updated URL for UK time zone history (in comments) A few typos in Le Corre's list of free French place names (comments) Release data2011n - 2011-10-30 14:57:54 +0700 There are three changes of note - most urgently, Cuba (America/Havana) has extended summer time by two weeks, now to end on Nov 13, rather than the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic (Europe/Tiraspol) decided not to split from the rest of Moldova after all, and consequently that zone has been removed (again) and reinstated in the "backward" file as a link to Europe/Chisinau. And third, the end date for Fiji's summer time this summer was moved forward from the earlier planned Feb 26, to Jan 22. Apart from that, Moldova (MD) returns to a single entry in zone.tab (and the incorrect syntax that was in the 2011m version of that file is so fixed - it would have been fixed in a different way had this change not happened - that's the "missing" sccs version id). Release data2011m - 2011-10-24 21:42:16 +0700 In particular, the typos in comments in the data (2011-11-17 should have been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that Tim Parenti noted) have been fixed, and the change for Ukraine has been made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to Tim Parenti, and also Denys Gavrysh) In addition, I added Europe/Tiraspol to zone.tab. This time, all the files have new version numbers... (including the files otherwise unchanged in 2011m that were changed in 2011l but didn't get new version numbers there...) Release data2011l - 2011-10-10 11:15:43 +0700 There are just 2 changes that cause different generated tzdata files from zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil is included, but commented out. Compared with the diff I sent out last week, this version also includes attributions for the sources for the changes (in much the same format as ado used, but the html tags have not been checked, verified, or used in any way at all, so if there are errors there, please let me know.) Release data2011k - 2011-09-20 17:54:03 -0400 [not summarized] Release data2011j - 2011-09-12 09:22:49 -0400 (contemporary changes for Samoa; past changes for Kenya, Uganda, and Tanzania); there are also two spelling corrections to comments in the australasia file (with thanks to Christos Zoulas). Release 2011i - 2011-08-29 05:56:32 -0400 [not summarized] Release data2011h - 2011-06-15 18:41:48 -0400 Russia and Curaçao changes Release 2011g - 2011-04-25 09:07:22 -0400 update the rules for Egypt to reflect its abandonment of DST this year Release 2011f - 2011-04-06 17:14:53 -0400 [not summarized] Release 2011e - 2011-03-31 16:04:38 -0400 Morocco, Chile, and tz-link changes Release 2011d - 2011-03-14 09:18:01 -0400 changes that impact present-day timestamps in Cuba, Samoa, and Turkey Release 2011c - 2011-03-07 09:30:09 -0500 These do affect current timestamps in Chile and Annette Island, Canada. Release 2011b - 2011-02-07 08:44:50 -0500 [not summarized] Release 2011a - 2011-01-24 10:30:16 -0500 [not summarized] Release data2010o - 2010-11-01 09:18:23 -0400 change to the end of DST in Fiji in 2011 Release 2010n - 2010-10-25 08:19:17 -0400 [not summarized] Release 2010m - 2010-09-27 09:24:48 -0400 Hong Kong, Vostok, and zic.c changes Release 2010l - 2010-08-16 06:57:25 -0400 [not summarized] Release 2010k - 2010-07-26 10:42:27 -0400 [not summarized] Release 2010j - 2010-05-10 09:07:48 -0400 changes for Bahía de Banderas and for version naming Release data2010i - 2010-04-16 18:50:45 -0400 the end of DST in Morocco on 2010-08-08 Release data2010h - 2010-04-05 09:58:56 -0400 [not summarized] Release data2010g - 2010-03-24 11:14:53 -0400 [not summarized] Release 2010f - 2010-03-22 09:45:46 -0400 [not summarized] Release data2010e - 2010-03-08 14:24:27 -0500 corrects the Dhaka bug found by Danvin Ruangchan Release data2010d - 2010-03-06 07:26:01 -0500 [not summarized] Release 2010c - 2010-03-01 09:20:58 -0500 changes including KRE's suggestion for earlier initialization of "goahead" and "goback" structure elements Release code2010a - 2010-02-16 10:40:04 -0500 [not summarized] Release data2010b - 2010-01-20 12:37:01 -0500 Mexico changes Release data2010a - 2010-01-18 08:30:04 -0500 changes to Dhaka Release data2009u - 2009-12-26 08:32:28 -0500 changes to DST in Bangladesh Release 2009t - 2009-12-21 13:24:27 -0500 [not summarized] Release data2009s - 2009-11-14 10:26:32 -0500 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change Release 2009r - 2009-11-09 10:10:31 -0500 "antarctica" and "tz-link.htm" changes Release 2009q - 2009-11-02 09:12:40 -0500 with two corrections as reported by Eric Muller and Philip Newton Release data2009p - 2009-10-23 15:05:27 -0400 Argentina (including San Luis) changes (with the correction from Mariano Absatz) Release data2009o - 2009-10-14 16:49:38 -0400 Samoa (commentary only), Pakistan, and Bangladesh changes Release data2009n - 2009-09-22 15:13:38 -0400 added commentary for Argentina and a change to the end of DST in 2009 in Pakistan Release data2009m - 2009-09-03 10:23:43 -0400 Samoa and Palestine changes Release data2009l - 2009-08-14 09:13:07 -0400 Samoa (comments only) and Egypt Release 2009k - 2009-07-20 09:46:08 -0400 [not summarized] Release data2009j - 2009-06-15 06:43:59 -0400 Bangladesh change (with a short turnaround since the DST change is impending) Release 2009i - 2009-06-08 09:21:22 -0400 updating for DST in Bangladesh this year Release 2009h - 2009-05-26 09:19:14 -0400 [not summarized] Release data2009g - 2009-04-20 16:34:07 -0400 Cairo Release data2009f - 2009-04-10 11:00:52 -0400 correct DST in Pakistan Release 2009e - 2009-04-06 09:08:11 -0400 [not summarized] Release 2009d - 2009-03-23 09:38:12 -0400 Morocco, Tunisia, Argentina, and American Astronomical Society changes Release data2009c - 2009-03-16 09:47:51 -0400 change to the start of Cuban DST Release 2009b - 2009-02-09 11:15:22 -0500 [not summarized] Release 2009a - 2009-01-21 10:09:39 -0500 [not summarized] Release data2008i - 2008-10-21 12:10:25 -0400 southamerica and zone.tab files, with Argentina DST rule changes and United States zone reordering and recommenting Release 2008h - 2008-10-13 07:33:56 -0400 [not summarized] Release 2008g - 2008-10-06 09:03:18 -0400 Fix a broken HTML anchor and update Brazil's DST transitions; there's also a slight reordering of information in tz-art.htm. Release data2008f - 2008-09-09 22:33:26 -0400 [not summarized] Release 2008e - 2008-07-28 14:11:17 -0400 changes by Arthur David Olson and Jesper Nørgaard Welen Release data2008d - 2008-07-07 09:51:38 -0400 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo Release data2008c - 2008-05-19 17:48:03 -0400 Pakistan, Morocco, and Mongolia Release data2008b - 2008-03-24 08:30:59 -0400 including renaming Asia/Calcutta to Asia/Kolkata, with a backward link provided Release 2008a - 2008-03-08 05:42:16 -0500 [not summarized] Release 2007k - 2007-12-31 10:25:22 -0500 most importantly, changes to the "southamerica" file based on Argentina's readoption of daylight saving time Release 2007j - 2007-12-03 09:51:01 -0500 1. eliminate the "P" (parameter) macro; 2. the "noncontroversial" changes circulated on the time zone mailing list (less the changes to "logwtmp.c"); 3. eliminate "too many transition" errors when "min" is used in time zone rules; 4. changes by Paul Eggert (including updated information for Venezuela). Release data2007i - 2007-10-30 10:28:11 -0400 changes for Cuba and Syria Release 2007h - 2007-10-01 10:05:51 -0400 changes by Paul Eggert, as well as an updated link to the ICU project in tz-link.htm Release 2007g - 2007-08-20 10:47:59 -0400 changes by Paul Eggert The "leapseconds" file has been updated to incorporate the most recent International Earth Rotation and Reference Systems Service (IERS) bulletin. There's an addition to tz-art.htm regarding the television show "Medium". Release 2007f - 2007-05-07 10:46:46 -0400 changes by Paul Eggert (including Haiti, Turks and Caicos, and New Zealand) changes to zic.c to allow hour values greater than 24 (along with Paul's improved time value overflow checking) Release 2007e - 2007-04-02 10:11:52 -0400 Syria and Honduras changes by Paul Eggert zic.c variable renaming changes by Arthur David Olson Release 2007d - 2007-03-20 08:48:30 -0400 changes by Paul Eggert the elimination of white space at the ends of lines Release 2007c - 2007-02-26 09:09:37 -0500 changes by Paul Eggert Release 2007b - 2007-02-12 09:34:20 -0500 Paul Eggert's proposed change to the quotation handling logic in zic.c. changes to the commentary in "leapseconds" reflecting the IERS announcement that there is to be no positive leap second at the end of June 2007. Release 2007a - 2007-01-08 12:28:29 -0500 changes by Paul Eggert Derick Rethans's Asmara change Oscar van Vlijmen's Easter Island local mean time change symbolic link changes Release 2006p - 2006-11-27 08:54:27 -0500 changes by Paul Eggert Release 2006o - 2006-11-06 09:18:07 -0500 changes by Paul Eggert Release 2006n - 2006-10-10 11:32:06 -0400 changes by Paul Eggert Release 2006m - 2006-10-02 15:32:35 -0400 changes for Uruguay, Palestine, and Egypt by Paul Eggert (minimalist) changes to zic.8 to clarify "until" information Release data2006l - 2006-09-18 12:58:11 -0400 Paul's best-effort work on this coming weekend's Egypt time change Release 2006k - 2006-08-28 12:19:09 -0400 changes by Paul Eggert Release 2006j - 2006-08-21 09:56:32 -0400 changes by Paul Eggert Release code2006i - 2006-08-07 12:30:55 -0400 localtime.c fixes Ken Pizzini's conversion script Release code2006h - 2006-07-24 09:19:37 -0400 adds public domain notices to four files includes a fix for transition times being off by a second adds a new recording to the "arts" file (information courtesy Colin Bowern) Release 2006g - 2006-05-08 17:18:09 -0400 northamerica changes by Paul Eggert Release 2006f - 2006-05-01 11:46:00 -0400 a missing version number problem is fixed (with thanks to Bradley White for catching the problem) Release 2006d - 2006-04-17 14:33:43 -0400 changes by Paul Eggert added new items to tz-arts.htm that were found by Paul Release 2006c - 2006-04-03 10:09:32 -0400 two sets of data changes by Paul Eggert a fencepost error fix in zic.c changes to zic.c and the "europe" file to minimize differences between output produced by the old 32-bit zic and the new 64-bit version Release 2006b - 2006-02-20 10:08:18 -0500 [tz32code2006b + tz64code2006b + tzdata2006b] 64-bit code All SCCS IDs were bumped to "8.1" for this release. Release 2006a - 2006-01-30 08:59:31 -0500 changes by Paul Eggert (in particular, Indiana time zone moves) an addition to the zic manual page to describe how special-case transitions are handled Release 2005r - 2005-12-27 09:27:13 -0500 Canadian changes by Paul Eggert They also add "
" directives to time zone data files and reflect
   changes to warning message logic in "zdump.c" (but with calls to
   "gettext" kept unbundled at the suggestion of Ken Pizzini).
 
 
 Release 2005q - 2005-12-13 09:17:09 -0500
 
   Nothing earth-shaking here:
 	1.  Electronic mail addresses have been removed.
 	2.  Casts of the return value of exit have been removed.
 	3.  Casts of the argument of is.* macros have been added.
 	4.  Indentation in one section of zic.c has been fixed.
 	5.  References to dead URLs in the data files have been dealt with.
 
 
 Release 2005p - 2005-12-05 10:30:53 -0500
 
   "systemv", "tz-link.htm", and "zdump.c" changes
   (less the casts of arguments to the is* macros)
 
 
 Release 2005o - 2005-11-28 10:55:26 -0500
 
   Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
 
   zdump.c lint fixes by Arthur David Olson
 
 
 Release 2005n - 2005-10-03 09:44:09 -0400
 
   changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
   et al. changes)
 
 
 Release 2005m - 2005-08-29 12:15:40 -0400
 
   changes by Paul Eggert (with a small tweak to the tz-art change)
 
   a declaration of an unused variable has been removed from zdump.c
 
 
 Release 2005l - 2005-08-22 12:06:39 -0400
 
   changes by Paul Eggert
 
   overflow/underflow checks by Arthur David Olson, minus changes to
   the "Theory" file about the pending addition of 64-bit data (I grow
   less confident of the changes being accepted with each passing day,
   and the changes no longer increase the data files nine-fold--there's
   less than a doubling in size by my local Sun's reckoning)
 
 
 Release 2005k - 2005-07-14 14:14:24 -0400
 
   The "leapseconds" file has been edited to reflect the recently
   announced leap second at the end of 2005.
 
   I've also deleted electronic mail addresses from the files as an
   anti-spam measure.
 
 
 Release 2005j - 2005-06-13 14:34:13 -0400
 
   These reflect changes to limit the length of time zone abbreviations
   and the characters used in those abbreviations.
 
   There are also changes to handle POSIX-style "quoted" timezone
   environment variables.
 
   The changes were circulated on the time zone mailing list; the only
   change since then was the removal of a couple of minimum-length of
   abbreviation checks.
 
 
 Release data2005i - 2005-04-21 15:04:16 -0400
 
   changes (most importantly to Nicaragua and Haiti) by Paul Eggert
 
 
 Release 2005h - 2005-04-04 11:24:47 -0400
 
   changes by Paul Eggert
 
   minor changes to Makefile and zdump.c to produce more useful output
   when doing a "make typecheck"
 
 
 Release 2005g - 2005-03-14 10:11:21 -0500
 
   changes by Paul Eggert (a change to current DST rules in Uruguay and
   an update to a link to time zone software)
 
 
 Release 2005f - 2005-03-01 08:45:32 -0500
 
   data and documentation changes by Paul Eggert
 
 
 Release 2005e - 2005-02-10 15:59:44 -0500
 
   [not summarized]
 
 
 Release code2005d - 2005-01-31 09:21:47 -0500
 
   make zic complain about links to links if the -v flag is used
 
   have "make public" do more code checking
 
   add an include to "localtime.c" for the benefit of gcc systems
 
 
 Release 2005c - 2005-01-17 18:36:29 -0500
 
   get better results when mktime runs on a system where time_t is double
 
   changes to the data files (most importantly to Paraguay)
 
 
 Release 2005b - 2005-01-10 09:19:54 -0500
 
   Get localtime and gmtime working on systems with exotic time_t types.
 
   Update the leap second commentary in the "leapseconds" file.
 
 
 Release 2005a - 2005-01-01 13:13:44 -0500
 
   [not summarized]
 
 
 Release code2004i - 2004-12-14 13:42:58 -0500
 
   Deal with systems where time_t is unsigned.
 
 
 Release code2004h - 2004-12-07 11:40:18 -0500
 
   64-bit-time_t changes
 
 
 Release 2004g - 2004-11-02 09:06:01 -0500
 
   update to Cuba (taking effect this weekend)
 
   other changes by Paul Eggert
 
   correction of the spelling of Oslo
 
   changed versions of difftime.c and private.h
 
 
 Release code2004f - 2004-10-21 10:25:22 -0400
 
   Cope with wide-ranging tm_year values.
 
 
 Release 2004e - 2004-10-11 14:47:21 -0400
 
   Brazil/Argentina/Israel changes by Paul Eggert
 
   changes to tz-link.htm by Paul
 
   one small fix to Makefile
 
 
 Release 2004d - 2004-09-22 08:27:29 -0400
 
   Avoid overflow problems when TM_YEAR_BASE is added to an integer.
 
 
 Release 2004c - 2004-08-11 12:06:26 -0400
 
   asctime-related changes
 
   (variants of) some of the documentation changes suggested by Paul Eggert
 
 
 Release 2004b - 2004-07-19 14:33:35 -0400
 
   data changes by Paul Eggert - most importantly, updates for Argentina
 
 
 Release 2004a - 2004-05-27 12:00:47 -0400
 
   changes by Paul Eggert
 
   Handle DST transitions that occur at the end of a month in some
   years but at the start of the following month in other years.
 
   Add a copy of the correspondence that's the basis for claims about
   DST in the Navajo Nation.
 
 
 Release 2003e - 2003-12-15 09:36:47 -0500
 
   changes by Arthur David Olson (primarily code changes)
 
   changes by Paul Eggert (primarily data changes)
 
   minor changes to "Makefile" and "northamerica" (in the latter case,
   optimization of the "Toronto" rules)
 
 
 Release 2003d - 2003-10-06 09:34:44 -0400
 
   changes by Paul Eggert
 
 
 Release 2003c - 2003-09-16 10:47:05 -0400
 
   Fix bad returns in zic.c's inleap function.
   Thanks to Bradley White for catching the problem!
 
 
 Release 2003b - 2003-09-16 07:13:44 -0400
 
   Add a "--version" option (and documentation) to the zic and zdump commands.
 
   changes to overflow/underflow checking in zic
 
   a localtime typo fix.
 
   Update the leapseconds and tz-art.htm files.
 
 
 Release 2003a - 2003-03-24 09:30:54 -0500
 
   changes by Paul Eggert
 
   a few additions and modifications to the tz-art.htm file
 
 
 Release 2002d - 2002-10-15 13:12:42 -0400
 
   changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
 
   There's also a new time zone quote in "tz-art.htm".
 
 
 Release 2002c - 2002-04-04 11:55:20 -0500
 
   changes by Paul Eggert
 
   Change zic.c to avoid creating symlinks to files that don't exist.
 
 
 Release 2002b - 2002-01-28 12:56:03 -0500
 
   [These change notes are for Release 2002a, which was corrupted.
   2002b was a corrected version of 2002a.]
 
   changes by Paul Eggert
 
   Update the "leapseconds" file to note that there'll be no leap
   second at the end of June, 2002.
 
   Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
 
   Change to "difftime.c" to avoid sizeof problems.
 
 
 Release 2001d - 2001-10-09 13:31:32 -0400
 
   changes by Paul Eggert
 
 
 Release 2001c - 2001-06-05 13:59:55 -0400
 
   changes by Paul Eggert and Andrew Brown
 
 
 Release 2001b - 2001-04-05 16:44:38 -0400
 
   changes by Paul Eggert (modulo jnorgard's typo fix)
 
   tz-art.htm has been HTMLified.
 
 
 Release 2001a - 2001-03-13 12:57:44 -0500
 
   changes by Paul Eggert
 
   An addition to the "leapseconds" file: comments with the text of the
   latest IERS leap second notice.
 
   Trailing white space has been removed from data file lines, and
   repeated spaces in "Rule Jordan" lines in the "asia" file have been
   converted to tabs.
 
 
 Release 2000h - 2000-12-14 15:33:38 -0500
 
   changes by Paul Eggert
 
   one typo fix in the "art" file
 
   With providence, this is the last update of the millennium.
 
 
 Release 2000g - 2000-10-10 11:35:22 -0400
 
   changes by Paul Eggert
 
   correction of John Mackin's name submitted by Robert Elz
 
   Garry Shandling's Daylight Saving Time joke (!?!) from the recent
   Emmy Awards broadcast.
 
 
 Release 2000f - 2000-08-10 09:31:58 -0400
 
   changes by Paul Eggert
 
   Added information in "tz-art.htm" on a Seinfeld reference to DST.
 
   Error checking and messages in the "yearistype" script have been
   improved.
 
 
 Release 2000e - 2000-07-31 09:27:54 -0400
 
   data changes by Paul Eggert
 
   a change to the default value of the defined constant HAVE_STRERROR
 
   the addition of a Dave Barry quote on DST to the tz-arts file
 
 
 Release 2000d - 2000-04-20 15:43:04 -0400
 
   changes to the documentation and code of strftime for C99 conformance
 
   a bug fix for date.c
 
   These are based on (though modified from) changes by Paul Eggert.
 
 
 Release 2000c - 2000-03-04 10:31:43 -0500
 
   changes by Paul Eggert
 
 
 Release 2000b - 2000-02-21 12:16:29 -0500
 
   changes by Paul Eggert and Joseph Myers
 
   modest tweaks to the tz-art.htm and tz-link.htm files
 
 
 Release 2000a - 2000-01-18 09:21:26 -0500
 
   changes by Paul Eggert
 
   The two hypertext documents have also been renamed.
 
 
 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
 
   Paul Eggert's changes
 
   additions to the "zic" manual page and the "Arts.htm" file
 
 
 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
 
   [not summarized]
 
 
 Release data1999h - 1999-10-07 03:50:29 -0400
 
   changes by Paul Eggert to "europe" (most importantly, fixing
   Lithuania and Estonia)
 
 
 Release 1999g - 1999-09-28 11:06:18 -0400
 
   data changes by Paul Eggert (most importantly, the change for
   Lebanon that buys correctness for this coming Sunday)
 
   The "code" file contains changes to "Makefile" and "checktab.awk" to
   allow better checking of time zone files before they are published.
 
 
 Release 1999f - 1999-09-23 09:48:14 -0400
 
   changes by Arthur David Olson and Paul Eggert
 
 
 Release 1999e - 1999-08-17 15:20:54 -0400
 
   changes circulated by Paul Eggert, although the change to handling
   of DST-specifying timezone names has been commented out for now
   (search for "XXX" in "localtime.c" for details).  These files also
   do not make any changes to the start of DST in Brazil.
 
   In addition to Paul's changes, there are updates to "Arts.htm" and
   cleanups of URLs.
 
 
 Release 1999d - 1999-03-30 11:31:07 -0500
 
   changes by Paul Eggert
 
   The Makefile's "make public" rule has also been changed to do a test
   compile of each individual time zone data file (which should help
   avoid problems such as the one we had with Nicosia).
 
 
 Release 1999c - 1999-03-25 09:47:47 -0500
 
   changes by Paul Eggert, most importantly the change for Chile.
 
 
 Release 1999b - 1999-02-01 17:51:44 -0500
 
   changes by Paul Eggert
 
   code changes (suggested by Mani Varadarajan, mani at be.com) for
   correct handling of symbolic links when building using a relative directory
 
   code changes to generate correct messages for failed links
 
   updates to the URLs in Arts.htm
 
 
 Release 1999a - 1999-01-19 16:20:29 -0500
 
   error message internationalizations and corrections in zic.c and
   zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
   to whom thanks!)
 
 
 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
 
   changes for Brazil, Chile, and Germany
 
   support for use of "24:00" in the input files for the time zone compiler
 
 
 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
 
   changes by Paul Eggert
 
   correction to a define in the "private.h" file
 
 
 Release data1998g - 1998-08-11 03:28:35 -0000
   [tzdata1998g.tar.gz is missing!]
 
   Lithuanian change provided by mgedmin at pub.osf.it
 
   Move creation of the GMT link with Etc/GMT to "etcetera" (from
   "backward") to ensure that the GMT file is created even where folks
   don't want the "backward" links (as suggested by Paul Eggert).
 
 
 Release data1998f - 1998-07-20 13:50:00 -0000
   [tzdata1998f.tar.gz is missing!]
 
   Update the "leapseconds" file to include the newly-announced
   insertion at the end of 1998.
 
 
 Release code1998f - 1998-06-01 10:18:31 -0400
 
   addition to localtime.c by Guy Harris
 
 
 Release 1998e - 1998-05-28 09:56:26 -0400
 
   The Makefile is changed to produce zoneinfo-posix rather than
   zoneinfo/posix, and to produce zoneinfo-leaps rather than
   zoneinfo/right.
 
   data changes by Paul Eggert
 
   changes from Guy Harris to provide asctime_r and ctime_r
 
   A usno1998 file (substantially identical to usno1997) has been added.
 
 
 Release 1998d - 1998-05-14 11:58:34 -0400
 
   changes to comments (in particular, elimination of references to CIA maps).
   "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
   where changes occur.
 
 
 Release 1998c - 1998-02-28 12:32:26 -0500
 
   changes by Paul Eggert (save the "French correction," on which I'll
   wait for the dust to settle)
 
   symlink changes
 
   changes and additions to Arts.htm
 
 
 Release 1998b - 1998-01-17 14:31:51 -0500
 
   URL cleanups and additions
 
 
 Release 1998a - 1998-01-13 12:37:35 -0500
 
   changes by Paul Eggert
 
 
 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
 
   changes by Paul Eggert, with minor modifications from Arthur David
   Olson to make the files more browser friendly
 
 
 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
 
   minor changes to put "TZif" at the start of each timezone information file
 
   a rule has also been added to the Makefile so you can
 	make zones
   to just recompile the zone information files (rather than doing a
   full "make install" with its other effects).
 
 
 Release data1997i - 1997-10-07 08:45:38 -0400
 
   changes to Africa by Paul Eggert
 
 
 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
 
   corrections for Uruguay (and other locations)
 
   Arthur David Olson's simple-minded fix allowing mktime to both
   correctly handle leap seconds and correctly handle tm_sec values
   upon which arithmetic has been performed.
 
 
 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
 
   Paul Eggert's updates
 
   a small change to a function prototype;
 
   "Music" has been renamed "Arts.htm", HTMLified, and augmented to
   include information on Around the World in Eighty Days.
 
 
 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
 
   fixes to zic's error handling
 
   changes inspired by the item circulated on Slovenia
 
   The description of Web resources has been HTMLified for browsing
   convenience.
 
   A new piece of tz-related music has been added to the "Music" file.
 
 
 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
 
   Paul Eggert's latest suggestions
 
 
 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
 
   changes to "zic.c" to correct performance of the "-s" option
 
   a new file "usno1997"
 
 
 Release data1997c - 1997-03-04 09:58:18 -0500
 
   changes in Israel
 
 
 Release 1997b - 1997-02-27 18:34:19 -0500
 
   The data file incorporates the 1997 leap second.
 
   The code file incorporates Arthur David Olson's take on the
   zic/multiprocessor/directory-creation situation.
 
 
 Release 1997a - 1997-01-21 09:11:10 -0500
 
   Paul Eggert's Antarctica (and other changes)
 
   Arthur David Olson finessed the "getopt" issue by checking against
   both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
   is returned while SunOS 5.5's manual says EOF is returned).
 
 
 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
 
   Paul Eggert's latest changes
 
 
 Release code1996n - 1996-12-16 09:42:02 -0500
 
   link snapping fix from Bruce Evans (via Garrett Wollman)
 
 
 Release data1996m - 1996-11-24 02:37:34 -0000
   [tzdata1996m.tar.gz is missing!]
 
   Paul Eggert's batch of changes
 
 
 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
 
   No functional changes here; the files have simply been changed to
   make more use of ISO style dates in comments. The names of the above
   files now include the year in full.
 
 
 Release code96l - 1996-09-08 17:12:20 -0400
 
   tzcode96k was missing a couple of pieces.
 
 
 Release 96k - 1996-09-08 16:06:22 -0400
 
   the latest round of changes from Paul Eggert
 
   the recent Year 2000 material
 
 
 Release code96j - 1996-07-30 13:18:53 -0400
 
   Set sp->typecnt as suggested by Timothy Patrick Murphy.
 
 
 Release code96i - 1996-07-27 20:11:35 -0400
 
   Paul's suggested patch for strftime %V week numbers
 
 
 Release data96i - 1996-07-01 18:13:04 -0400
 
   "northamerica" and "europe" changes by Paul Eggert
 
 
 Release code96h - 1996-06-05 08:02:21 -0400
 
   fix for handling transitions specified in Universal Time
 
   Some "public domain" notices have also been added.
 
 
 Release code96g - 1996-05-16 14:00:26 -0400
 
   fix for the simultaneous-DST-and-zone-change challenge
 
 
 Release data96h - 1996-05-09 17:40:51 -0400
 
   changes by Paul Eggert
 
 
 Release code96f-data96g - 1996-05-03 03:09:59 -0000
   [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
 
   The changes get us some of the way to fixing the problems noted in Paul
   Eggert's letter yesterday (in addition to a few others).  The approach
   has been to make zic a bit smarter about figuring out what time zone
   abbreviations apply just after the time specified in the "UNTIL" part
   of a zone line.  Putting the smarts in zic means avoiding having
   transition times show up in both "Zone" lines and "Rule" lines, which
   in turn avoids multiple transition time entries in time zone files.
   (This also makes the zic input files such as "europe" a bit shorter and
   should ease maintenance.)
 
 
 Release data96f - 1996-04-19 19:20:03 -0000
   [tzdata96f.tar.gz is missing!]
 
   The only changes are to the "northamerica" file; the time zone
   abbreviation for Denver is corrected to MST (and MDT), and the
   comments for Mexico have been updated.
 
 
 Release data96e - 1996-03-19 17:37:26 -0500
 
   Proposals by Paul Eggert, in particular the Portugal change that
   comes into play at the end of this month.
 
 
 Release data96d - 1996-03-18 20:49:39 -0500
 
   [not summarized]
 
 
 Release code96e - 1996-02-29 15:43:27 -0000
   [tzcode96e.tar.gz is missing!]
 
   internationalization changes and the fix to the documentation for strftime
 
 
 Release code96d-data96c - 1996-02-12 11:05:27 -0500
 
   The "code" file simply updates Bob Kridle's electronic address.
 
   The "data" file updates rules for Mexico.
 
 
 Release data96b - 1996-01-27 15:44:42 -0500
 
   Kiribati change
 
 
 Release code96c - 1996-01-16 16:58:15 -0500
 
   leap-year streamlining and binary-search changes
 
   fix to newctime.3
 
 
 Release code96b - 1996-01-10 20:42:39 -0500
 
   fixes and enhancements from Paul Eggert, including code that
   emulates the behavior of recent versions of the SunOS "date"
   command.
 
 
 Release 96a - 1996-01-06 09:08:24 -0500
 
   Israel updates
 
   fixes to strftime.c for correct ISO 8601 week number generation,
   plus support for two new formats ('G' and 'g') to give ISO 8601 year
   numbers (which are not necessarily the same as calendar year numbers)
 
 
 Release code95i-data95m - 1995-12-21 12:46:47 -0500
 
   The latest revisions from Paul Eggert are included, the usno1995
   file has been updated, and a new file ("WWW") covering useful URLs
   has been added.
 
 
 Release code95h-data95l - 1995-12-19 18:10:12 -0500
 
   A simplification of a macro definition, a change to data for Sudan,
   and (for last minute shoppers) notes in the "Music" file on the CD
   "Old Man Time".
 
 
 Release code95g-data95k - 1995-10-30 10:32:47 -0500
 
   (slightly reformatted) 8-bit-clean proposed patch
 
   minor patch: US/Eastern -> America/New_York
 
   snapshot of the USNO's latest data ("usno1995")
 
   some other minor cleanups
 
 
 Release code95f-data95j - 1995-10-28 21:01:34 -0000
   [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
 
   European cleanups
 
   support for 64-bit time_t's
 
   optimization in localtime.c
 
 
 Release code95e - 1995-10-13 13:23:57 -0400
 
   the mktime change to scan from future to past when trying to find time zone
   offsets
 
 
 Release data95i - 1995-09-26 10:43:26 -0400
 
   For Canada/Central, guess that the Sun customer's "one week too
   early" was just a approximation, and the true error is one month
   too early.  This is consistent with the rest of Canada.
 
 
 Release data95h - 1995-09-21 11:26:48 -0400
 
   latest changes from Paul Eggert
 
 
 Release code95d - 1995-09-14 11:14:45 -0400
 
   the addition of a "Music" file, which documents four recorded
   versions of the tune "Save That Time".
 
 
 Release data95g - 1995-09-01 17:21:36 -0400
 
   "yearistype" correction
 
 
 Release data95f - 1995-08-28 20:46:56 -0400
 
   Paul Eggert's change to the australasia file
 
 
 Release data95e - 1995-07-08 18:02:34 -0400
 
   The only change is a leap second at the end of this year.
   Thanks to Bradley White for forwarding news on the leap second.
 
 
 Release data95d - 1995-07-03 13:26:22 -0400
 
   Paul Eggert's changes
 
 
 Release data95c - 1995-07-02 19:19:28 -0400
 
   changes to "asia", "backward", "europe", and "southamerica"
   (read: northamericacentrics need not apply)
 
 
 Release code95c - 1995-03-13 14:00:46 -0500
 
   one-line fix for sign extension problems in detzcode
 
 
 Release 95b - 1995-03-04 11:22:38 -0500
 
   Minor changes in both:
 
   The "code" file contains a workaround for the lack of "unistd.h" in
   Microsoft C++ version 7.
 
   The "data" file contains a fixed "Link" for America/Shiprock.
 
 
 Release 94h - 1994-12-10 12:51:14 -0500
 
   The files:
 
   *	incorporate the changes to "zdump" and "date" to make changes to
 	the "TZ" environment variable permanent;
 
   *	incorporate the table changes by Paul Eggert;
 
   *	include (and document) support for universal time specifications in
 	data files - but do not (yet) include use of this feature in the
 	data files.
 
   Think of this as "TZ Classic" - the software has been set up not to break if
   universal time shows up in its input, and data entries have been
   left as is so as not to break existing implementations.
 
 
 Release data94f - 1994-08-20 12:56:09 -0400
 
   (with thanks!) the latest data updates from Paul Eggert
 
 
 Release data94e - 1994-06-04 13:13:53 -0400
 
   [not summarized]
 
 
 Release code94g - 1994-05-05 12:14:07 -0400
 
   fix missing "optind.c" and a reference to it in the Makefile
 
 
 Release code94f - 1994-05-05 13:00:33 -0000
   [tzcode94f.tar.gz is missing!]
 
   changes to avoid overflow in difftime, as well as changes to cope
   with the 52/53 challenge in strftime
 
 
 Release code94e - 1994-03-30 23:32:59 -0500
 
   change for the benefit of PCTS
 
 
 Release 94d - 1994-02-24 15:42:25 -0500
 
   Avoid clashes with POSIX semantics for zones such as GMT+4.
 
   Some other very minor housekeeping is also present.
 
 
 Release code94c - 1994-02-10 08:52:40 -0500
 
   Fix bug where mkdirs was broken unless you compile with
   -fwritable-strings (which is generally losing to do).
 
 
 Release 94b - 1994-02-07 10:04:33 -0500
 
   work by Paul Eggert who notes:
 
   I found another book of time zone histories by E W Whitman; it's not
   as extensive as Shanks but has a few goodies of its own.  I used it
   to update the tables.  I also fixed some more as a result of
   correspondence with Adam David and Peter Ilieve, and move some stray
   links from 'europe' to 'backward'.  I corrected some scanning errors
   in usno1989.
 
   As far as the code goes, I fixed zic to allow years in the range
   INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
   And I cleaned up the zic documentation a little bit.
 
 
 Release data94a - 1994-02-03 08:58:54 -0500
 
   It simply incorporates the recently announced leap second into the
   "leapseconds" file.
 
 
 Release 93g - 1993-11-22 17:28:27 -0500
 
   Paul Eggert has provided a good deal of historic information (based
   on Shanks), and there are some code changes to deal with the buglets
   that crawled out in dealing with the new information.
 
 
 Release 93f - 1993-10-15 12:27:46 -0400
 
   Paul Eggert's changes
 
 
 Release 93e - 1993-09-05 21:21:44 -0400
 
   This has updated data for Israel, England, and Kwajalein.  There's
   also an update to "zdump" to cope with Kwajalein's 24-hour jump.
   Thanks to Paul Eggert and Peter Ilieve for the changes.
 
 
 Release 93d - 1993-06-17 23:34:17 -0400
 
   new fix and new data on Israel
 
 
 Release 93c - 1993-06-06 19:31:55 -0400
 
   [not summarized]
 
 
 Release 93b - 1993-02-02 14:53:58 -0500
 
   updated "leapseconds" file
 
 
 Release 93 - 1993-01-08 07:01:06 -0500
 
   At kre's suggestion, the package has been split in two - a code piece
   (which also includes documentation) that's only of use to folks who
   want to recompile things and a data piece useful to anyone who can
   run "zic".
 
   The new version has a few changes to the data files, a few
   portability changes, and an off-by-one fix (with thanks to
   Tom Karzes at deshaw.com for providing a description and a
   solution).
 
 
 Release 92c - 1992-11-21 17:35:36 -0000
   [tz92c.tar.Z is missing!]
 
   The fallout from the latest round of DST transitions.
 
   There are changes for Portugal, Saskatchewan, and "Pacific-New";
   there's also a change to "zic.c" that makes it portable to more systems.
 
 
 Release 92 - 1992-04-25 18:17:03 -0000
   [tz92.tar.Z is missing!]
 
   By popular demand (well, at any rate, following a request by kre at munnari)
 
 
 The 1989 update of the time zone package featured:
 
   *	POSIXization (including interpretation of POSIX-style TZ environment
 	variables, provided by Guy Harris),
   *	ANSIfication (including versions of "mktime" and "difftime"),
   *	SVIDulation (an "altzone" variable)
   *	MACHination (the "gtime" function)
   *	corrections to some time zone data (including corrections to the rules
 	for Great Britain and New Zealand)
   *	reference data from the United States Naval Observatory for folks who
 	want to do additional time zones
   *	and the 1989 data for Saudi Arabia.
 
   (Since this code will be treated as "part of the implementation" in some
   places and as "part of the application" in others, there's no good way to
   name functions, such as timegm, that are not part of the proposed ANSI C
   standard; such functions have kept their old, underscore-free names in this
   update.)
 
   And the "dysize" function has disappeared; it was present to allow
   compilation of the "date" command on old BSD systems, and a version of "date"
   is now provided in the package.  The "date" command is not created when you
   "make all" since it may lack options provided by the version distributed with
   your operating system, or may not interact with the system in the same way
   the native version does.
 
   Since POSIX frowns on correct leap second handling, the default behavior of
   the "zic" command (in the absence of a "-L" option) has been changed to omit
   leap second information from its output files.
 
 
 -----
 Notes
 
 This file contains copies of the part of each release announcement
 that talks about the changes in that release.  The text has been
 adapted and reformatted for the purposes of this file.
 
 Traditionally a release R consists of a pair of tarball files,
 tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
 code2010a, data2012c) consist of just one or the other tarball, and a
 few (e.g., code2012c-data2012d) have tarballs with mixed version
 numbers.  Recent releases also come in an experimental format
 consisting of a single tarball tzdb-R.tar.lz with extra data.
 
 Release timestamps are taken from the release's commit (for newer,
 Git-based releases), from the newest file in the tarball (for older
 releases, where this info is available) or from the email announcing
 the release (if all else fails; these are marked with a time zone
 abbreviation of -0000 and an "is missing!" comment).
 
 Earlier versions of the code and data were not announced on the tz
 list and are not summarized here.
 
 This file is in the public domain.
 
 Local Variables:
 coding: utf-8
 End:
diff --git a/africa b/africa
index 92a61259f916..cfb9283c045d 100644
--- a/africa
+++ b/africa
@@ -1,1432 +1,1436 @@
 # tzdb data for Africa and environs
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # This file is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
 # From Paul Eggert (2018-05-27):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 #
 # Many years ago Gwillim Law wrote that a good source
 # for time zone data was the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
 # of the IATA's data after 1990.  Except where otherwise noted,
 # IATA SSIM is the source for entries after 1990.
 #
 # Another source occasionally used is Edward W. Whitman, World Time Differences,
 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
 # I found in the UCLA library.
 #
 # For data circa 1899, a common source is:
 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
 # https://www.jstor.org/stable/1774359
 #
 # European-style abbreviations are commonly used along the Mediterranean.
 # For sub-Saharan Africa abbreviations were less standardized.
 # Previous editions of this database used WAT, CAT, SAT, and EAT
 # for UT +00 through +03, respectively,
 # but in 1997 Mark R V Murray reported that
 # 'SAST' is the official abbreviation for +02 in the country of South Africa,
 # 'CAT' is commonly used for +02 in countries north of South Africa, and
 # 'WAT' is probably the best name for +01, as the common phrase for
 # the area that includes Nigeria is "West Africa".
 #
 # To summarize, the following abbreviations seemed to have some currency:
 #	 +00	GMT	Greenwich Mean Time
 #	 +02	CAT	Central Africa Time
 #	 +02	SAST	South Africa Standard Time
 # and Murray suggested the following abbreviation:
 #	 +01	WAT	West Africa Time
 # Murray's suggestion seems to have caught on in news reports and the like.
 # I vaguely recall 'WAT' also being used for -01 in the past but
 # cannot now come up with solid citations.
 #
 # I invented the following abbreviations in the 1990s:
 #	 +02	WAST	West Africa Summer Time
 #	 +03	CAST	Central Africa Summer Time
 #	 +03	SAST	South Africa Summer Time
 #	 +03	EAT	East Africa Time
 # 'EAT' seems to have caught on and is in current timestamps, and though
 # the other abbreviations are rarer and are only in past timestamps,
 # they are paired with better-attested non-DST abbreviations.
 # Corrections are welcome.
 
 # Algeria
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Algeria	1916	only	-	Jun	14	23:00s	1:00	S
 Rule	Algeria	1916	1919	-	Oct	Sun>=1	23:00s	0	-
 Rule	Algeria	1917	only	-	Mar	24	23:00s	1:00	S
 Rule	Algeria	1918	only	-	Mar	 9	23:00s	1:00	S
 Rule	Algeria	1919	only	-	Mar	 1	23:00s	1:00	S
 Rule	Algeria	1920	only	-	Feb	14	23:00s	1:00	S
 Rule	Algeria	1920	only	-	Oct	23	23:00s	0	-
 Rule	Algeria	1921	only	-	Mar	14	23:00s	1:00	S
 Rule	Algeria	1921	only	-	Jun	21	23:00s	0	-
 Rule	Algeria	1939	only	-	Sep	11	23:00s	1:00	S
 Rule	Algeria	1939	only	-	Nov	19	 1:00	0	-
 Rule	Algeria	1944	1945	-	Apr	Mon>=1	 2:00	1:00	S
 Rule	Algeria	1944	only	-	Oct	 8	 2:00	0	-
 Rule	Algeria	1945	only	-	Sep	16	 1:00	0	-
 Rule	Algeria	1971	only	-	Apr	25	23:00s	1:00	S
 Rule	Algeria	1971	only	-	Sep	26	23:00s	0	-
 Rule	Algeria	1977	only	-	May	 6	 0:00	1:00	S
 Rule	Algeria	1977	only	-	Oct	21	 0:00	0	-
 Rule	Algeria	1978	only	-	Mar	24	 1:00	1:00	S
 Rule	Algeria	1978	only	-	Sep	22	 3:00	0	-
 Rule	Algeria	1980	only	-	Apr	25	 0:00	1:00	S
 Rule	Algeria	1980	only	-	Oct	31	 2:00	0	-
 # See Europe/Paris for PMT-related transitions.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Algiers	0:12:12 -	LMT	1891 Mar 16
 			0:09:21	-	PMT	1911 Mar 11 # Paris Mean Time
 			0:00	Algeria	WE%sT	1940 Feb 25  2:00
 			1:00	Algeria	CE%sT	1946 Oct  7
 			0:00	-	WET	1956 Jan 29
 			1:00	-	CET	1963 Apr 14
 			0:00	Algeria	WE%sT	1977 Oct 21
 			1:00	Algeria	CE%sT	1979 Oct 26
 			0:00	Algeria	WE%sT	1981 May
 			1:00	-	CET
 
 # Cape Verde / Cabo Verde
 #
 # From Paul Eggert (2018-02-16):
 # Shanks gives 1907 for the transition to +02.
 # For now, ignore that and follow the 1911-05-26 Portuguese decree
 # (see Europe/Lisbon).
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/Cape_Verde -1:34:04 -	LMT	1912 Jan 01  2:00u # Praia
 			-2:00	-	-02	1942 Sep
 			-2:00	1:00	-01	1945 Oct 15
 			-2:00	-	-02	1975 Nov 25  2:00
 			-1:00	-	-01
 
 # Chad
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Ndjamena	1:00:12 -	LMT	1912        # N'Djamena
 			1:00	-	WAT	1979 Oct 14
 			1:00	1:00	WAST	1980 Mar  8
 			1:00	-	WAT
 
 # Burkina Faso
 # Côte d'Ivoire (Ivory Coast)
 # The Gambia
 # Ghana
 # Guinea
 # Iceland
 # Mali
 # Mauritania
 # St Helena
 # Senegal
 # Sierra Leone
 # Togo
 
 # The other parts of the St Helena territory are similar:
 #	Tristan da Cunha: on GMT, say Whitman and the CIA
 #	Ascension: on GMT, say the USNO (1995-12-21) and the CIA
 #	Gough (scientific station since 1955; sealers wintered previously):
 #		on GMT, says the CIA
 #	Inaccessible, Nightingale: uninhabited
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Abidjan	-0:16:08 -	LMT	1912
 			 0:00	-	GMT
 
 ###############################################################################
 
 # Egypt
 
 # Milne says Cairo used 2:05:08.9, the local mean time of the Abbasizeh
 # observatory.  Milne also says that the official time for
 # Egypt was mean noon at the Great Pyramid, 2:04:30.5, but apparently this
 # did not apply to Cairo, Alexandria, or Port Said.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Egypt	1940	only	-	Jul	15	0:00	1:00	S
 Rule	Egypt	1940	only	-	Oct	 1	0:00	0	-
 Rule	Egypt	1941	only	-	Apr	15	0:00	1:00	S
 Rule	Egypt	1941	only	-	Sep	16	0:00	0	-
 Rule	Egypt	1942	1944	-	Apr	 1	0:00	1:00	S
 Rule	Egypt	1942	only	-	Oct	27	0:00	0	-
 Rule	Egypt	1943	1945	-	Nov	 1	0:00	0	-
 Rule	Egypt	1945	only	-	Apr	16	0:00	1:00	S
 Rule	Egypt	1957	only	-	May	10	0:00	1:00	S
 Rule	Egypt	1957	1958	-	Oct	 1	0:00	0	-
 Rule	Egypt	1958	only	-	May	 1	0:00	1:00	S
 Rule	Egypt	1959	1981	-	May	 1	1:00	1:00	S
 Rule	Egypt	1959	1965	-	Sep	30	3:00	0	-
 Rule	Egypt	1966	1994	-	Oct	 1	3:00	0	-
 Rule	Egypt	1982	only	-	Jul	25	1:00	1:00	S
 Rule	Egypt	1983	only	-	Jul	12	1:00	1:00	S
 Rule	Egypt	1984	1988	-	May	 1	1:00	1:00	S
 Rule	Egypt	1989	only	-	May	 6	1:00	1:00	S
 Rule	Egypt	1990	1994	-	May	 1	1:00	1:00	S
 # IATA (after 1990) says transitions are at 0:00.
 # Go with IATA starting in 1995, except correct 1995 entry from 09-30 to 09-29.
 
 # From Alexander Krivenyshev (2011-04-20):
 # "...Egypt's interim cabinet decided on Wednesday to cancel daylight
 # saving time after a poll posted on its website showed the majority of
 # Egyptians would approve the cancellation."
 #
 # Egypt to cancel daylight saving time
 # http://www.almasryalyoum.com/en/node/407168
 # or
 # http://www.worldtimezone.com/dst_news/dst_news_egypt04.html
 Rule	Egypt	1995	2010	-	Apr	lastFri	 0:00s	1:00	S
 Rule	Egypt	1995	2005	-	Sep	lastThu	24:00	0	-
 # From Steffen Thorsen (2006-09-19):
 # The Egyptian Gazette, issue 41,090 (2006-09-18), page 1, reports:
 # Egypt will turn back clocks by one hour at the midnight of Thursday
 # after observing the daylight saving time since May.
 # http://news.gom.com.eg/gazette/pdf/2006/09/18/01.pdf
 Rule	Egypt	2006	only	-	Sep	21	24:00	0	-
 # From Dirk Losch (2007-08-14):
 # I received a mail from an airline which says that the daylight
 # saving time in Egypt will end in the night of 2007-09-06 to 2007-09-07.
 # From Jesper Nørgaard Welen (2007-08-15): [The following agree:]
 # http://www.nentjes.info/Bill/bill5.htm
 # https://www.timeanddate.com/worldclock/city.html?n=53
 # From Steffen Thorsen (2007-09-04): The official information...:
 # http://www.sis.gov.eg/En/EgyptOnline/Miscellaneous/000002/0207000000000000001580.htm
 Rule	Egypt	2007	only	-	Sep	Thu>=1	24:00	0	-
 # From Abdelrahman Hassan (2007-09-06):
 # Due to the Hijri (lunar Islamic calendar) year being 11 days shorter
 # than the year of the Gregorian calendar, Ramadan shifts earlier each
 # year. This year it will be observed September 13 (September is quite
 # hot in Egypt), and the idea is to make fasting easier for workers by
 # shifting business hours one hour out of daytime heat. Consequently,
 # unless discontinued, next DST may end Thursday 28 August 2008.
 # From Paul Eggert (2007-08-17):
 # For lack of better info, assume the new rule is last Thursday in August.
 
 # From Petr Machata (2009-04-06):
 # The following appeared in Red Hat bugzilla[1] (edited):
 #
 # > $ zdump -v /usr/share/zoneinfo/Africa/Cairo | grep 2009
 # > /usr/share/zoneinfo/Africa/Cairo  Thu Apr 23 21:59:59 2009 UTC = Thu =
 # Apr 23
 # > 23:59:59 2009 EET isdst=0 gmtoff=7200
 # > /usr/share/zoneinfo/Africa/Cairo  Thu Apr 23 22:00:00 2009 UTC = Fri =
 # Apr 24
 # > 01:00:00 2009 EEST isdst=1 gmtoff=10800
 # > /usr/share/zoneinfo/Africa/Cairo  Thu Aug 27 20:59:59 2009 UTC = Thu =
 # Aug 27
 # > 23:59:59 2009 EEST isdst=1 gmtoff=10800
 # > /usr/share/zoneinfo/Africa/Cairo  Thu Aug 27 21:00:00 2009 UTC = Thu =
 # Aug 27
 # > 23:00:00 2009 EET isdst=0 gmtoff=7200
 #
 # > end date should be Thu Sep 24 2009 (Last Thursday in September at 23:59=
 # :59)
 # > http://support.microsoft.com/kb/958729/
 #
 # timeanddate[2] and another site I've found[3] also support that.
 #
 # [1] https://bugzilla.redhat.com/show_bug.cgi?id=492263
 # [2] https://www.timeanddate.com/worldclock/clockchange.html?n=53
 # [3] https://wwp.greenwichmeantime.com/time-zone/africa/egypt/
 
 # From Arthur David Olson (2009-04-20):
 # In 2009 (and for the next several years), Ramadan ends before the fourth
 # Thursday in September; Egypt is expected to revert to the last Thursday
 # in September.
 
 # From Steffen Thorsen (2009-08-11):
 # We have been able to confirm the August change with the Egyptian Cabinet
 # Information and Decision Support Center:
 # https://www.timeanddate.com/news/time/egypt-dst-ends-2009.html
 #
 # The Middle East News Agency
 # https://www.mena.org.eg/index.aspx
 # also reports "Egypt starts winter time on August 21"
 # today in article numbered "71, 11/08/2009 12:25 GMT."
 # Only the title above is available without a subscription to their service,
 # and can be found by searching for "winter" in their search engine
 # (at least today).
 
 # From Alexander Krivenyshev (2010-07-20):
 # According to News from Egypt - Al-Masry Al-Youm Egypt's cabinet has
 # decided that Daylight Saving Time will not be used in Egypt during
 # Ramadan.
 #
 # Arabic translation:
 # "Clocks to go back during Ramadan - and then forward again"
 # http://www.almasryalyoum.com/en/news/clocks-go-back-during-ramadan-and-then-forward-again
 # http://www.worldtimezone.com/dst_news/dst_news_egypt02.html
 
 # From Ahmad El-Dardiry (2014-05-07):
 # Egypt is to change back to Daylight system on May 15
 # http://english.ahram.org.eg/NewsContent/1/64/100735/Egypt/Politics-/Egypts-government-to-reapply-daylight-saving-time-.aspx
 
 # From Gunther Vermier (2014-05-13):
 # our Egypt office confirms that the change will be at 15 May "midnight" (24:00)
 
 # From Imed Chihi (2014-06-04):
 # We have finally "located" a precise official reference about the DST changes
 # in Egypt.  The Ministers Cabinet decision is explained at
 # http://www.cabinet.gov.eg/Media/CabinetMeetingsDetails.aspx?id=347 ...
 # [T]his (Arabic) site is not accessible outside Egypt, but the page ...
 # translates into: "With regard to daylight saving time, it is scheduled to
 # take effect at exactly twelve o'clock this evening, Thursday, 15 MAY 2014,
 # to be suspended by twelve o'clock on the evening of Thursday, 26 JUN 2014,
 # and re-established again at the end of the month of Ramadan, at twelve
 # o'clock on the evening of Thursday, 31 JUL 2014."  This statement has been
 # reproduced by other (more accessible) sites[, e.g.,]...
 # http://elgornal.net/news/news.aspx?id=4699258
 
 # From Paul Eggert (2014-06-04):
 # Sarah El Deeb and Lee Keath of AP report that the Egyptian government says
 # the change is because of blackouts in Cairo, even though Ahram Online (cited
 # above) says DST had no affect on electricity consumption.  There is
 # no information about when DST will end this fall.  See:
 # http://abcnews.go.com/International/wireStory/el-sissi-pushes-egyptians-line-23614833
 
 # From Steffen Thorsen (2015-04-08):
 # Egypt will start DST on midnight after Thursday, April 30, 2015.
 # This is based on a law (no 35) from May 15, 2014 saying it starts the last
 # Thursday of April....  Clocks will still be turned back for Ramadan, but
 # dates not yet announced....
 # http://almogaz.com/news/weird-news/2015/04/05/1947105 ...
 # https://www.timeanddate.com/news/time/egypt-starts-dst-2015.html
 
 # From Ahmed Nazmy (2015-04-20):
 # Egypt's ministers cabinet just announced ... that it will cancel DST at
 # least for 2015.
 #
 # From Tim Parenti (2015-04-20):
 # http://english.ahram.org.eg/WriterArticles/NewsContentP/1/128195/Egypt/No-daylight-saving-this-summer-Egypts-prime-minist.aspx
 # "Egypt's cabinet agreed on Monday not to switch clocks for daylight saving
 # time this summer, and carry out studies on the possibility of canceling the
 # practice altogether in future years."
 #
 # From Paul Eggert (2015-04-24):
 # Yesterday the office of Egyptian President El-Sisi announced his
 # decision to abandon DST permanently.  See Ahram Online 2015-04-24.
 # http://english.ahram.org.eg/NewsContent/1/64/128509/Egypt/Politics-/Sisi-cancels-daylight-saving-time-in-Egypt.aspx
 
 # From Steffen Thorsen (2016-04-29):
 # Egypt will have DST from July 7 until the end of October....
 # http://english.ahram.org.eg/NewsContentP/1/204655/Egypt/Daylight-savings-time-returning-to-Egypt-on--July.aspx
 # From Mina Samuel (2016-07-04):
 # Egyptian government took the decision to cancel the DST,
 
 Rule	Egypt	2008	only	-	Aug	lastThu	24:00	0	-
 Rule	Egypt	2009	only	-	Aug	20	24:00	0	-
 Rule	Egypt	2010	only	-	Aug	10	24:00	0	-
 Rule	Egypt	2010	only	-	Sep	 9	24:00	1:00	S
 Rule	Egypt	2010	only	-	Sep	lastThu	24:00	0	-
 Rule	Egypt	2014	only	-	May	15	24:00	1:00	S
 Rule	Egypt	2014	only	-	Jun	26	24:00	0	-
 Rule	Egypt	2014	only	-	Jul	31	24:00	1:00	S
 Rule	Egypt	2014	only	-	Sep	lastThu	24:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	2:05:08.9
 Zone	Africa/Cairo	2:05:09 -	LMT	1900 Oct
 			2:00	Egypt	EE%sT
 
 # Guinea-Bissau
 #
 # From Paul Eggert (2018-02-16):
 # Shanks gives 1911-05-26 for the transition to WAT,
 # evidently confusing the date of the Portuguese decree
 # (see Europe/Lisbon) with the date that it took effect.
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Bissau	-1:02:20 -	LMT	1912 Jan  1  1:00u
 			-1:00	-	-01	1975
 			 0:00	-	GMT
 
 # Comoros
 # Djibouti
 # Eritrea
 # Ethiopia
 # Kenya
 # Madagascar
 # Mayotte
 # Somalia
 # Tanzania
 # Uganda
 
 # From P Chan (2020-10-24):
 #
 # The standard time of GMT+2:30 was adopted in the East Africa Protectorate....
 # [The Official Gazette, 1908-05-01, p 274]
 # https://books.google.com/books?id=e-cAC-sjPSEC&pg=PA274
 #
 # At midnight on 30 June 1928 the clocks throughout Kenya was put forward
 # half an hour by the Alteration of Time Ordinance, 1928.
 # https://gazettes.africa/archive/ke/1928/ke-government-gazette-dated-1928-05-11-no-28.pdf
 # [Ordinance No. 11 of 1928, The Official Gazette, 1928-06-26, p 813]
 # https://books.google.com/books?id=2S0S6os32ZUC&pg=PA813
 #
 # The 1928 ordinance was repealed by the Alteration of Time (repeal) Ordinance,
 # 1929 and the time was restored to GMT+2:30 at midnight on 4 January 1930.
 # [Ordinance No. 97 of 1929, The Official Gazette, 1929-12-31, p 2701]
 # https://books.google.com/books?id=_g18jIZQlwwC&pg=PA2701
 #
 # The Alteration of Time Ordinance, 1936 changed the time to GMT+2:45
 # and repealed the previous ordinance at midnight on 31 December 1936.
 # [The Official Gazette, 1936-07-21, p 705]
 # https://books.google.com/books?id=K7j41z0aC5wC&pg=PA705
 #
 # The Defence (Amendment of Laws No. 120) Regulations changed the time
 # to GMT+3 at midnight on 31 July 1942.
 # [Kenya Official Gazette Supplement No. 32, 1942-07-21, p 331]
 # https://books.google.com/books?hl=zh-TW&id=c_E-AQAAIAAJ&pg=PA331
 # The provision of the 1936 ordinance was not repealed and was later
 # incorporated in the Interpretation and General Clauses Ordinance in 1948.
 # Although it was overridden by the 1942 regulations.
 # [The Laws of Kenya in force on 1948-09-21, Title I, Chapter 1, 31]
 # https://dds.crl.edu/item/217517 (p.101)
 # In 1950 the Interpretation and General Clauses Ordinance was amended to adopt
 # GMT+3 permanently as the 1942 regulations were due to expire on 10 December.
 # https://books.google.com/books?id=jvR8mUDAwR0C&pg=PA787
 # [Ordinance No. 44 of 1950, Kenya Ordinances 1950, Vol. XXIX, p 294]
 # https://books.google.com/books?id=-_dQAQAAMAAJ&pg=PA294
 
 # From Paul Eggert (2020-10-24):
 # The 1908-05-01 announcement does not give an effective date,
 # so just say "1908 May".
 
 # From Paul Eggert (2018-09-11):
 # Unfortunately tzdb records only Western clock time in use in Ethiopia,
 # as the tzdb format is not up to properly recording a common Ethiopian
 # timekeeping practice that is based on solar time.  See:
 # Mortada D. If you have a meeting in Ethiopia, you'd better double
 # check the time. PRI's The World. 2015-01-30 15:15 -05.
 # https://www.pri.org/stories/2015-01-30/if-you-have-meeting-ethiopia-you-better-double-check-time
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Nairobi	2:27:16	-	LMT	1908 May
 			2:30	-	+0230	1928 Jun 30 24:00
 			3:00	-	EAT	1930 Jan  4 24:00
 			2:30	-	+0230	1936 Dec 31 24:00
 			2:45	-	+0245	1942 Jul 31 24:00
 			3:00	-	EAT
 
 # Liberia
 #
 # From Paul Eggert (2017-03-02):
 #
 # The Nautical Almanac for the Year 1970, p 264, is the source for -0:44:30.
 #
 # In 1972 Liberia was the last country to switch from a UT offset
 # that was not a multiple of 15 or 20 minutes.  The 1972 change was on
 # 1972-01-07, according to an entry dated 1972-01-04 on p 330 of:
 # Presidential Papers: First year of the administration of
 # President William R. Tolbert, Jr., July 23, 1971-July 31, 1972.
 # Monrovia: Executive Mansion.
 #
 # Use the abbreviation "MMT" before 1972, as the more-accurate numeric
 # abbreviation "-004430" would be one byte over the POSIX limit.
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Monrovia	-0:43:08 -	LMT	1882
 			-0:43:08 -	MMT	1919 Mar # Monrovia Mean Time
 			-0:44:30 -	MMT	1972 Jan 7 # approximately MMT
 			 0:00	-	GMT
 
 ###############################################################################
 
 # Libya
 
 # From Even Scharning (2012-11-10):
 # Libya set their time one hour back at 02:00 on Saturday November 10.
 # https://www.libyaherald.com/2012/11/04/clocks-to-go-back-an-hour-on-saturday/
 # Here is an official source [in Arabic]: http://ls.ly/fb6Yc
 #
 # Steffen Thorsen forwarded a translation (2012-11-10) in
 # https://mm.icann.org/pipermail/tz/2012-November/018451.html
 #
 # From Tim Parenti (2012-11-11):
 # Treat the 2012-11-10 change as a zone change from UTC+2 to UTC+1.
 # The DST rules planned for 2013 and onward roughly mirror those of Europe
 # (either two days before them or five days after them, so as to fall on
 # lastFri instead of lastSun).
 
 # From Even Scharning (2013-10-25):
 # The scheduled end of DST in Libya on Friday, October 25, 2013 was
 # cancelled yesterday....
 # https://www.libyaherald.com/2013/10/24/correction-no-time-change-tomorrow/
 #
 # From Paul Eggert (2013-10-25):
 # For now, assume they're reverting to the pre-2012 rules of permanent UT +02.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Libya	1951	only	-	Oct	14	2:00	1:00	S
 Rule	Libya	1952	only	-	Jan	 1	0:00	0	-
 Rule	Libya	1953	only	-	Oct	 9	2:00	1:00	S
 Rule	Libya	1954	only	-	Jan	 1	0:00	0	-
 Rule	Libya	1955	only	-	Sep	30	0:00	1:00	S
 Rule	Libya	1956	only	-	Jan	 1	0:00	0	-
 Rule	Libya	1982	1984	-	Apr	 1	0:00	1:00	S
 Rule	Libya	1982	1985	-	Oct	 1	0:00	0	-
 Rule	Libya	1985	only	-	Apr	 6	0:00	1:00	S
 Rule	Libya	1986	only	-	Apr	 4	0:00	1:00	S
 Rule	Libya	1986	only	-	Oct	 3	0:00	0	-
 Rule	Libya	1987	1989	-	Apr	 1	0:00	1:00	S
 Rule	Libya	1987	1989	-	Oct	 1	0:00	0	-
 Rule	Libya	1997	only	-	Apr	 4	0:00	1:00	S
 Rule	Libya	1997	only	-	Oct	 4	0:00	0	-
 Rule	Libya	2013	only	-	Mar	lastFri	1:00	1:00	S
 Rule	Libya	2013	only	-	Oct	lastFri	2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Tripoli	0:52:44 -	LMT	1920
 			1:00	Libya	CE%sT	1959
 			2:00	-	EET	1982
 			1:00	Libya	CE%sT	1990 May  4
 # The 1996 and 1997 entries are from Shanks & Pottenger;
 # the IATA SSIM data entries contain some obvious errors.
 			2:00	-	EET	1996 Sep 30
 			1:00	Libya	CE%sT	1997 Oct  4
 			2:00	-	EET	2012 Nov 10  2:00
 			1:00	Libya	CE%sT	2013 Oct 25  2:00
 			2:00	-	EET
 
 # Mauritius
 
 # From Steffen Thorsen (2008-06-25):
 # Mauritius plans to observe DST from 2008-11-01 to 2009-03-31 on a trial
 # basis....
 # It seems that Mauritius observed daylight saving time from 1982-10-10 to
 # 1983-03-20 as well, but that was not successful....
 # https://www.timeanddate.com/news/time/mauritius-daylight-saving-time.html
 
 # From Alex Krivenyshev (2008-06-25):
 # http://economicdevelopment.gov.mu/portal/site/Mainhomepage/menuitem.a42b24128104d9845dabddd154508a0c/?content_id=0a7cee8b5d69a110VgnVCM1000000a04a8c0RCRD
 
 # From Arthur David Olson (2008-06-30):
 # The www.timeanddate.com article cited by Steffen Thorsen notes that "A
 # final decision has yet to be made on the times that daylight saving
 # would begin and end on these dates." As a place holder, use midnight.
 
 # From Paul Eggert (2008-06-30):
 # Follow Thorsen on DST in 1982/1983, instead of Shanks & Pottenger.
 
 # From Steffen Thorsen (2008-07-10):
 # According to
 # http://www.lexpress.mu/display_article.php?news_id=111216
 # (in French), Mauritius will start and end their DST a few days earlier
 # than previously announced (2008-11-01 to 2009-03-31).  The new start
 # date is 2008-10-26 at 02:00 and the new end date is 2009-03-27 (no time
 # given, but it is probably at either 2 or 3 wall clock time).
 #
 # A little strange though, since the article says that they moved the date
 # to align itself with Europe and USA which also change time on that date,
 # but that means they have not paid attention to what happened in
 # USA/Canada last year (DST ends first Sunday in November). I also wonder
 # why that they end on a Friday, instead of aligning with Europe which
 # changes two days later.
 
 # From Alex Krivenyshev (2008-07-11):
 # Seems that English language article "The revival of daylight saving
 # time: Energy conservation?"- No. 16578 (07/11/2008) was originally
 # published on Monday, June 30, 2008...
 #
 # I guess that article in French "Le gouvernement avance l'introduction
 # de l'heure d'été" stating that DST in Mauritius starting on October 26
 # and ending on March 27, 2009 is the most recent one....
 # http://www.worldtimezone.com/dst_news/dst_news_mauritius02.html
 
 # From Riad M. Hossen Ally (2008-08-03):
 # The Government of Mauritius weblink
 # http://www.gov.mu/portal/site/pmosite/menuitem.4ca0efdee47462e7440a600248a521ca/?content_id=4728ca68b2a5b110VgnVCM1000000a04a8c0RCRD
 # Cabinet Decision of July 18th, 2008 states as follows:
 #
 # 4. ...Cabinet has agreed to the introduction into the National Assembly
 # of the Time Bill which provides for the introduction of summer time in
 # Mauritius. The summer time period which will be of one hour ahead of
 # the standard time, will be aligned with that in Europe and the United
 # States of America. It will start at two o'clock in the morning on the
 # last Sunday of October and will end at two o'clock in the morning on
 # the last Sunday of March the following year. The summer time for the
 # year 2008-2009 will, therefore, be effective as from 26 October 2008
 # and end on 29 March 2009.
 
 # From Ed Maste (2008-10-07):
 # THE TIME BILL (No. XXVII of 2008) Explanatory Memorandum states the
 # beginning / ending of summer time is 2 o'clock standard time in the
 # morning of the last Sunday of October / last Sunday of March.
 # http://www.gov.mu/portal/goc/assemblysite/file/bill2708.pdf
 
 # From Steffen Thorsen (2009-06-05):
 # According to several sources, Mauritius will not continue to observe
 # DST the coming summer...
 #
 # Some sources, in French:
 # http://www.defimedia.info/news/946/Rashid-Beebeejaun-:-%C2%AB-L%E2%80%99heure-d%E2%80%99%C3%A9t%C3%A9-ne-sera-pas-appliqu%C3%A9e-cette-ann%C3%A9e-%C2%BB
 # http://lexpress.mu/Story/3398~Beebeejaun---Les-objectifs-d-%C3%A9conomie-d-%C3%A9nergie-de-l-heure-d-%C3%A9t%C3%A9-ont-%C3%A9t%C3%A9-atteints-
 #
 # Our wrap-up:
 # https://www.timeanddate.com/news/time/mauritius-dst-will-not-repeat.html
 
 # From Arthur David Olson (2009-07-11):
 # The "mauritius-dst-will-not-repeat" wrapup includes this:
 # "The trial ended on March 29, 2009, when the clocks moved back by one hour
 # at 2am (or 02:00) local time..."
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule Mauritius	1982	only	-	Oct	10	0:00	1:00	-
 Rule Mauritius	1983	only	-	Mar	21	0:00	0	-
 Rule Mauritius	2008	only	-	Oct	lastSun	2:00	1:00	-
 Rule Mauritius	2009	only	-	Mar	lastSun	2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Indian/Mauritius	3:50:00 -	LMT	1907 # Port Louis
 			4:00 Mauritius	+04/+05
 # Agalega Is, Rodriguez
 # no information; probably like Indian/Mauritius
 
+
+# Morocco
+# See Africa/Ceuta for Spanish Morocco.
+
 # From Alex Krivenyshev (2008-05-09):
 # Here is an article that Morocco plan to introduce Daylight Saving Time between
 # 1 June, 2008 and 27 September, 2008.
 #
 # "... Morocco is to save energy by adjusting its clock during summer so it will
 # be one hour ahead of GMT between 1 June and 27 September, according to
 # Communication Minister and Government Spokesman, Khalid Naciri...."
 #
 # http://www.worldtimezone.com/dst_news/dst_news_morocco01.html
 # http://en.afrik.com/news11892.html
 
 # From Alex Krivenyshev (2008-05-09):
 # The Morocco time change can be confirmed on Morocco web site Maghreb Arabe
 # Presse:
 # http://www.map.ma/eng/sections/box3/morocco_shifts_to_da/view
 #
 # Morocco shifts to daylight time on June 1st through September 27, Govt.
 # spokesman.
 
 # From Patrice Scattolin (2008-05-09):
 # According to this article:
 # https://www.avmaroc.com/actualite/heure-dete-comment-a127896.html
 # (and republished here: )
 # the changes occur at midnight:
 #
 # Saturday night May 31st at midnight (which in French is to be
 # interpreted as the night between Saturday and Sunday)
 # Sunday night the 28th at midnight
 #
 # Seeing that the 28th is Monday, I am guessing that she intends to say
 # the midnight of the 28th which is the midnight between Sunday and
 # Monday, which jives with other sources that say that it's inclusive
 # June 1st to Sept 27th.
 #
 # The decision was taken by decree *2-08-224 *but I can't find the decree
 # published on the web.
 #
 # It's also confirmed here:
 # http://www.maroc.ma/NR/exeres/FACF141F-D910-44B0-B7FA-6E03733425D1.htm
 # on a government portal as being between June 1st and Sept 27th (not yet
 # posted in English).
 #
 # The following Google query will generate many relevant hits:
 # https://www.google.com/search?hl=en&q=Conseil+de+gouvernement+maroc+heure+avance&btnG=Search
 
 # From Steffen Thorsen (2008-08-27):
 # Morocco will change the clocks back on the midnight between August 31
 # and September 1. They originally planned to observe DST to near the end
 # of September:
 #
 # One article about it (in French):
 # http://www.menara.ma/fr/Actualites/Maroc/Societe/ci.retour_a_l_heure_gmt_a_partir_du_dimanche_31_aout_a_minuit_officiel_.default
 #
 # We have some further details posted here:
 # https://www.timeanddate.com/news/time/morocco-ends-dst-early-2008.html
 
 # From Steffen Thorsen (2009-03-17):
 # Morocco will observe DST from 2009-06-01 00:00 to 2009-08-21 00:00 according
 # to many sources, such as
 # http://news.marweb.com/morocco/entertainment/morocco-daylight-saving.html
 # http://www.medi1sat.ma/fr/depeche.aspx?idp=2312
 # (French)
 #
 # Our summary:
 # https://www.timeanddate.com/news/time/morocco-starts-dst-2009.html
 
 # From Alexander Krivenyshev (2009-03-17):
 # Here is a link to official document from Royaume du Maroc Premier Ministre,
 # Ministère de la Modernisation des Secteurs Publics
 #
 # Under Article 1 of Royal Decree No. 455-67 of Act 23 safar 1387 (2 June 1967)
 # concerning the amendment of the legal time, the Ministry of Modernization of
 # Public Sectors announced that the official time in the Kingdom will be
 # advanced 60 minutes from Sunday 31 May 2009 at midnight.
 #
 # http://www.mmsp.gov.ma/francais/Actualites_fr/PDF_Actualites_Fr/HeureEte_FR.pdf
 # http://www.worldtimezone.com/dst_news/dst_news_morocco03.html
 
 # From Steffen Thorsen (2010-04-13):
 # Several news media in Morocco report that the Ministry of Modernization
 # of Public Sectors has announced that Morocco will have DST from
 # 2010-05-02 to 2010-08-08.
 #
 # Example:
 # http://www.lavieeco.com/actualites/4099-le-maroc-passera-a-l-heure-d-ete-gmt1-le-2-mai.html
 # (French)
 # Our page:
 # https://www.timeanddate.com/news/time/morocco-starts-dst-2010.html
 
 # From Dan Abitol (2011-03-30):
 # ...Rules for Africa/Casablanca are the following (24h format)
 # The 3rd April 2011 at 00:00:00, [it] will be 3rd April 01:00:00
 # The 31st July 2011 at 00:59:59, [it] will be 31st July 00:00:00
 # ...Official links of change in morocco
 # The change was broadcast on the FM Radio
 # I ve called ANRT (telecom regulations in Morocco) at
 # +212.537.71.84.00
 # http://www.anrt.net.ma/fr/
 # They said that
 # http://www.map.ma/fr/sections/accueil/l_heure_legale_au_ma/view
 # is the official publication to look at.
 # They said that the decision was already taken.
 #
 # More articles in the press
 # https://www.yabiladi.com/articles/details/5058/secret-l-heure-d-ete-maroc-leve.html
 # http://www.lematin.ma/Actualite/Express/Article.asp?id=148923
 # http://www.lavieeco.com/actualite/Le-Maroc-passe-sur-GMT%2B1-a-partir-de-dim
 
 # From Petr Machata (2011-03-30):
 # They have it written in English here:
 # http://www.map.ma/eng/sections/home/morocco_to_spring_fo/view
 #
 # It says there that "Morocco will resume its standard time on July 31,
 # 2011 at midnight." Now they don't say whether they mean midnight of
 # wall clock time (i.e. 11pm UTC), but that's what I would assume. It has
 # also been like that in the past.
 
 # From Alexander Krivenyshev (2012-03-09):
 # According to Infomédiaire web site from Morocco (infomediaire.ma),
 # on March 9, 2012, (in French) Heure légale:
 # Le Maroc adopte officiellement l'heure d'été
 # http://www.infomediaire.ma/news/maroc/heure-l%C3%A9gale-le-maroc-adopte-officiellement-lheure-d%C3%A9t%C3%A9
 # Governing Council adopted draft decree, that Morocco DST starts on
 # the last Sunday of March (March 25, 2012) and ends on
 # last Sunday of September (September 30, 2012)
 # except the month of Ramadan.
 # or (brief)
 # http://www.worldtimezone.com/dst_news/dst_news_morocco06.html
 
 # From Arthur David Olson (2012-03-10):
 # The infomediaire.ma source indicates that the system is to be in
 # effect every year. It gives 03H00 as the "fall back" time of day;
 # it lacks a "spring forward" time of day; assume 2:00 XXX.
 # Wait on specifying the Ramadan exception for details about
 # start date, start time of day, end date, and end time of day XXX.
 
 # From Christophe Tropamer (2012-03-16):
 # Seen Morocco change again:
 # http://www.le2uminutes.com/actualite.php
 # "...à partir du dernier dimanche d'avril et non fins mars,
 # comme annoncé précédemment."
 
 # From Milamber Space Network (2012-07-17):
 # The official return to GMT is announced by the Moroccan government:
 # http://www.mmsp.gov.ma/fr/actualites.aspx?id=288 [in French]
 #
 # Google translation, lightly edited:
 # Back to the standard time of the Kingdom (GMT)
 # Pursuant to Decree No. 2-12-126 issued on 26 Jumada (I) 1433 (April 18,
 # 2012) and in accordance with the order of Mr. President of the
 # Government No. 3-47-12 issued on 24 Sha'ban (11 July 2012), the Ministry
 # of Public Service and Administration Modernization announces the return
 # of the legal time of the Kingdom (GMT) from Friday, July 20, 2012 until
 # Monday, August 20, 2012.  So the time will be delayed by 60 minutes from
 # 3:00 am Friday, July 20, 2012 and will again be advanced by 60 minutes
 # August 20, 2012 from 2:00 am.
 
 # From Paul Eggert (2013-03-06):
 # Morocco's daylight-saving transitions due to Ramadan seem to be
 # announced a bit in advance.  On 2012-07-11 the Moroccan government
 # announced that year's Ramadan daylight-saving transitions would be
 # 2012-07-20 and 2012-08-20; see
 # http://www.mmsp.gov.ma/fr/actualites.aspx?id=288
 
 # From Andrew Paprocki (2013-07-02):
 # Morocco announced that the year's Ramadan daylight-savings
 # transitions would be 2013-07-07 and 2013-08-10; see:
 # http://www.maroc.ma/en/news/morocco-suspends-daylight-saving-time-july-7-aug10
 
 # From Steffen Thorsen (2013-09-28):
 # Morocco extends DST by one month, on very short notice, just 1 day
 # before it was going to end.  There is a new decree (2.13.781) for
 # this, where DST from now on goes from last Sunday of March at 02:00
 # to last Sunday of October at 03:00, similar to EU rules.  Official
 # source (French):
 # http://www.maroc.gov.ma/fr/actualites/lhoraire-dete-gmt1-maintenu-jusquau-27-octobre-2013
 # Another source (specifying the time for start and end in the decree):
 # http://www.lemag.ma/Heure-d-ete-au-Maroc-jusqu-au-27-octobre_a75620.html
 
 # From Sebastien Willemijns (2014-03-18):
 # http://www.afriquinfos.com/articles/2014/3/18/maroc-heure-dete-avancez-tous-horloges-247891.asp
 
 # From Milamber Space Network (2014-06-05):
 # The Moroccan government has recently announced that the country will return
 # to standard time at 03:00 on Saturday, June 28, 2014 local time....  DST
 # will resume again at 02:00 on Saturday, August 2, 2014....
 # http://www.mmsp.gov.ma/fr/actualites.aspx?id=586
 
 # From Milamber (2015-06-08):
 # (Google Translation) The hour will thus be delayed 60 minutes
 # Sunday, June 14 at 3:00, the ministry said in a statement, adding
 # that the time will be advanced again 60 minutes Sunday, July 19,
 # 2015 at 2:00.  The move comes under 2.12.126 Decree of 26 Jumada I
 # 1433 (18 April 2012) and the decision of the Head of Government of
 # 16 N. 3-29-15 Chaaban 1435 (4 June 2015).
 # Source (french):
 # https://lnt.ma/le-maroc-reculera-dune-heure-le-dimanche-14-juin/
 #
 # From Milamber (2015-06-09):
 # http://www.mmsp.gov.ma/fr/actualites.aspx?id=863
 #
 # From Michael Deckers (2015-06-09):
 # [The gov.ma announcement] would (probably) make the switch on 2015-07-19 go
 # from 03:00 to 04:00 rather than from 02:00 to 03:00, as in the patch....
 # I think the patch is correct and the quoted text is wrong; the text in
 #  agrees
 # with the patch.
 
 # From Mohamed Essedik Najd (2018-10-26):
 # Today, a Moroccan government council approved the perpetual addition
 # of 60 minutes to the regular Moroccan timezone.
 # From Matt Johnson (2018-10-28):
 # http://www.sgg.gov.ma/Portals/1/BO/2018/BO_6720-bis_Ar.pdf
 #
 # From Maamar Abdelkader (2018-11-01):
 # We usually move clocks back the previous week end and come back to the +1
 # the week end after....  The government does not announce yet the decision
 # about this temporary change.  But it s 99% sure that it will be the case,
 # as in previous years.  An unofficial survey was done these days, showing
 # that 64% of asked people are ok for moving from +1 to +0 during Ramadan.
 # https://leconomiste.com/article/1035870-enquete-l-economiste-sunergia-64-des-marocains-plebiscitent-le-gmt-pendant-ramadan
 
 # From Naoufal Semlali (2019-04-16):
 # Morocco will be on GMT starting from Sunday, May 5th 2019 at 3am.
 # The switch to GMT+1 will occur on Sunday, June 9th 2019 at 2am....
 # http://fr.le360.ma/societe/voici-la-date-du-retour-a-lheure-legale-au-maroc-188222
 
 # From Semlali Naoufal (2020-04-14):
 # Following the announcement by the Moroccan government, the switch to
 # GMT time will take place on Sunday, April 19, 2020 from 3 a.m. and
 # the return to GMT+1 time will take place on Sunday, May 31, 2020 at 2 a.m....
 # https://maroc-diplomatique.net/maroc-le-retour-a-lheure-gmt-est-prevu-dimanche-prochain/
 # http://aujourdhui.ma/actualite/gmt1-retour-a-lheure-normale-dimanche-prochain-1
 #
 # From Milamber (2020-05-31)
 # In Morocco (where I live), the end of Ramadan (Arabic month) is followed by
 # the Eid al-Fitr, and concretely it's 1 or 2 day offs for the people (with
 # traditional visiting of family, big lunches/dinners, etc.).  So for this
 # year the astronomical calculations don't include the following 2 days off in
 # the calc.  These 2 days fall in a Sunday/Monday, so it's not acceptable by
 # people to have a time shift during these 2 days off.  Perhaps you can modify
 # the (predicted) rules for next years: if the end of Ramadan is a (probable)
 # Friday or Saturday (and so the 2 days off are on a weekend), the next time
 # shift will be the next weekend.
 #
 # From Paul Eggert (2020-05-31):
 # For now, guess that in the future Morocco will fall back at 03:00
 # the last Sunday before Ramadan, and spring forward at 02:00 the
 # first Sunday after two days after Ramadan.  To implement this,
 # transition dates and times for 2019 through 2087 were determined by
 # running the following program under GNU Emacs 26.3.  (This algorithm
 # also produces the correct transition dates for 2016 through 2018,
 # though the times differ due to Morocco's time zone change in 2018.)
 # (let ((islamic-year 1440))
 #   (require 'cal-islam)
 #   (while (< islamic-year 1511)
 #     (let ((a (calendar-islamic-to-absolute (list 9 1 islamic-year)))
 #           (b (+ 2 (calendar-islamic-to-absolute (list 10 1 islamic-year))))
 #           (sunday 0))
 #       (while (/= sunday (mod (setq a (1- a)) 7)))
 #       (while (/= sunday (mod b 7))
 #         (setq b (1+ b)))
 #       (setq a (calendar-gregorian-from-absolute a))
 #       (setq b (calendar-gregorian-from-absolute b))
 #       (insert
 #        (format
 #         (concat "Rule\tMorocco\t%d\tonly\t-\t%s\t%2d\t 3:00\t-1:00\t-\n"
 #                 "Rule\tMorocco\t%d\tonly\t-\t%s\t%2d\t 2:00\t0\t-\n")
 #         (car (cdr (cdr a))) (calendar-month-name (car a) t) (car (cdr a))
 #         (car (cdr (cdr b))) (calendar-month-name (car b) t) (car (cdr b)))))
 #     (setq islamic-year (+ 1 islamic-year))))
 #
 # From Milamber (2021-03-31, 2022-03-10), confirming these predictions:
 # https://www.mmsp.gov.ma/fr/actualites.aspx?id=2076
 # https://www.ecoactu.ma/horaires-administration-ramadan-gmtheure-gmt-a-partir-de-dimanche-27-mars/
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Morocco	1939	only	-	Sep	12	 0:00	1:00	-
 Rule	Morocco	1939	only	-	Nov	19	 0:00	0	-
 Rule	Morocco	1940	only	-	Feb	25	 0:00	1:00	-
 Rule	Morocco	1945	only	-	Nov	18	 0:00	0	-
 Rule	Morocco	1950	only	-	Jun	11	 0:00	1:00	-
 Rule	Morocco	1950	only	-	Oct	29	 0:00	0	-
 Rule	Morocco	1967	only	-	Jun	 3	12:00	1:00	-
 Rule	Morocco	1967	only	-	Oct	 1	 0:00	0	-
 Rule	Morocco	1974	only	-	Jun	24	 0:00	1:00	-
 Rule	Morocco	1974	only	-	Sep	 1	 0:00	0	-
 Rule	Morocco	1976	1977	-	May	 1	 0:00	1:00	-
 Rule	Morocco	1976	only	-	Aug	 1	 0:00	0	-
 Rule	Morocco	1977	only	-	Sep	28	 0:00	0	-
 Rule	Morocco	1978	only	-	Jun	 1	 0:00	1:00	-
 Rule	Morocco	1978	only	-	Aug	 4	 0:00	0	-
 Rule	Morocco	2008	only	-	Jun	 1	 0:00	1:00	-
 Rule	Morocco	2008	only	-	Sep	 1	 0:00	0	-
 Rule	Morocco	2009	only	-	Jun	 1	 0:00	1:00	-
 Rule	Morocco	2009	only	-	Aug	21	 0:00	0	-
 Rule	Morocco	2010	only	-	May	 2	 0:00	1:00	-
 Rule	Morocco	2010	only	-	Aug	 8	 0:00	0	-
 Rule	Morocco	2011	only	-	Apr	 3	 0:00	1:00	-
 Rule	Morocco	2011	only	-	Jul	31	 0:00	0	-
 Rule	Morocco	2012	2013	-	Apr	lastSun	 2:00	1:00	-
 Rule	Morocco	2012	only	-	Jul	20	 3:00	0	-
 Rule	Morocco	2012	only	-	Aug	20	 2:00	1:00	-
 Rule	Morocco	2012	only	-	Sep	30	 3:00	0	-
 Rule	Morocco	2013	only	-	Jul	 7	 3:00	0	-
 Rule	Morocco	2013	only	-	Aug	10	 2:00	1:00	-
 Rule	Morocco	2013	2018	-	Oct	lastSun	 3:00	0	-
 Rule	Morocco	2014	2018	-	Mar	lastSun	 2:00	1:00	-
 Rule	Morocco	2014	only	-	Jun	28	 3:00	0	-
 Rule	Morocco	2014	only	-	Aug	 2	 2:00	1:00	-
 Rule	Morocco	2015	only	-	Jun	14	 3:00	0	-
 Rule	Morocco	2015	only	-	Jul	19	 2:00	1:00	-
 Rule	Morocco	2016	only	-	Jun	 5	 3:00	0	-
 Rule	Morocco	2016	only	-	Jul	10	 2:00	1:00	-
 Rule	Morocco	2017	only	-	May	21	 3:00	0	-
 Rule	Morocco	2017	only	-	Jul	 2	 2:00	1:00	-
 Rule	Morocco	2018	only	-	May	13	 3:00	0	-
 Rule	Morocco	2018	only	-	Jun	17	 2:00	1:00	-
 Rule	Morocco	2019	only	-	May	 5	 3:00	-1:00	-
 Rule	Morocco	2019	only	-	Jun	 9	 2:00	0	-
 Rule	Morocco	2020	only	-	Apr	19	 3:00	-1:00	-
 Rule	Morocco	2020	only	-	May	31	 2:00	0	-
 Rule	Morocco	2021	only	-	Apr	11	 3:00	-1:00	-
 Rule	Morocco	2021	only	-	May	16	 2:00	0	-
 Rule	Morocco	2022	only	-	Mar	27	 3:00	-1:00	-
 Rule	Morocco	2022	only	-	May	 8	 2:00	0	-
 Rule	Morocco	2023	only	-	Mar	19	 3:00	-1:00	-
 Rule	Morocco	2023	only	-	Apr	30	 2:00	0	-
 Rule	Morocco	2024	only	-	Mar	10	 3:00	-1:00	-
 Rule	Morocco	2024	only	-	Apr	14	 2:00	0	-
 Rule	Morocco	2025	only	-	Feb	23	 3:00	-1:00	-
 Rule	Morocco	2025	only	-	Apr	 6	 2:00	0	-
 Rule	Morocco	2026	only	-	Feb	15	 3:00	-1:00	-
 Rule	Morocco	2026	only	-	Mar	22	 2:00	0	-
 Rule	Morocco	2027	only	-	Feb	 7	 3:00	-1:00	-
 Rule	Morocco	2027	only	-	Mar	14	 2:00	0	-
 Rule	Morocco	2028	only	-	Jan	23	 3:00	-1:00	-
 Rule	Morocco	2028	only	-	Mar	 5	 2:00	0	-
 Rule	Morocco	2029	only	-	Jan	14	 3:00	-1:00	-
 Rule	Morocco	2029	only	-	Feb	18	 2:00	0	-
 Rule	Morocco	2029	only	-	Dec	30	 3:00	-1:00	-
 Rule	Morocco	2030	only	-	Feb	10	 2:00	0	-
 Rule	Morocco	2030	only	-	Dec	22	 3:00	-1:00	-
 Rule	Morocco	2031	only	-	Feb	 2	 2:00	0	-
 Rule	Morocco	2031	only	-	Dec	14	 3:00	-1:00	-
 Rule	Morocco	2032	only	-	Jan	18	 2:00	0	-
 Rule	Morocco	2032	only	-	Nov	28	 3:00	-1:00	-
 Rule	Morocco	2033	only	-	Jan	 9	 2:00	0	-
 Rule	Morocco	2033	only	-	Nov	20	 3:00	-1:00	-
 Rule	Morocco	2033	only	-	Dec	25	 2:00	0	-
 Rule	Morocco	2034	only	-	Nov	 5	 3:00	-1:00	-
 Rule	Morocco	2034	only	-	Dec	17	 2:00	0	-
 Rule	Morocco	2035	only	-	Oct	28	 3:00	-1:00	-
 Rule	Morocco	2035	only	-	Dec	 9	 2:00	0	-
 Rule	Morocco	2036	only	-	Oct	19	 3:00	-1:00	-
 Rule	Morocco	2036	only	-	Nov	23	 2:00	0	-
 Rule	Morocco	2037	only	-	Oct	 4	 3:00	-1:00	-
 Rule	Morocco	2037	only	-	Nov	15	 2:00	0	-
 Rule	Morocco	2038	only	-	Sep	26	 3:00	-1:00	-
 Rule	Morocco	2038	only	-	Nov	 7	 2:00	0	-
 Rule	Morocco	2039	only	-	Sep	18	 3:00	-1:00	-
 Rule	Morocco	2039	only	-	Oct	23	 2:00	0	-
 Rule	Morocco	2040	only	-	Sep	 2	 3:00	-1:00	-
 Rule	Morocco	2040	only	-	Oct	14	 2:00	0	-
 Rule	Morocco	2041	only	-	Aug	25	 3:00	-1:00	-
 Rule	Morocco	2041	only	-	Sep	29	 2:00	0	-
 Rule	Morocco	2042	only	-	Aug	10	 3:00	-1:00	-
 Rule	Morocco	2042	only	-	Sep	21	 2:00	0	-
 Rule	Morocco	2043	only	-	Aug	 2	 3:00	-1:00	-
 Rule	Morocco	2043	only	-	Sep	13	 2:00	0	-
 Rule	Morocco	2044	only	-	Jul	24	 3:00	-1:00	-
 Rule	Morocco	2044	only	-	Aug	28	 2:00	0	-
 Rule	Morocco	2045	only	-	Jul	 9	 3:00	-1:00	-
 Rule	Morocco	2045	only	-	Aug	20	 2:00	0	-
 Rule	Morocco	2046	only	-	Jul	 1	 3:00	-1:00	-
 Rule	Morocco	2046	only	-	Aug	12	 2:00	0	-
 Rule	Morocco	2047	only	-	Jun	23	 3:00	-1:00	-
 Rule	Morocco	2047	only	-	Jul	28	 2:00	0	-
 Rule	Morocco	2048	only	-	Jun	 7	 3:00	-1:00	-
 Rule	Morocco	2048	only	-	Jul	19	 2:00	0	-
 Rule	Morocco	2049	only	-	May	30	 3:00	-1:00	-
 Rule	Morocco	2049	only	-	Jul	 4	 2:00	0	-
 Rule	Morocco	2050	only	-	May	15	 3:00	-1:00	-
 Rule	Morocco	2050	only	-	Jun	26	 2:00	0	-
 Rule	Morocco	2051	only	-	May	 7	 3:00	-1:00	-
 Rule	Morocco	2051	only	-	Jun	18	 2:00	0	-
 Rule	Morocco	2052	only	-	Apr	28	 3:00	-1:00	-
 Rule	Morocco	2052	only	-	Jun	 2	 2:00	0	-
 Rule	Morocco	2053	only	-	Apr	13	 3:00	-1:00	-
 Rule	Morocco	2053	only	-	May	25	 2:00	0	-
 Rule	Morocco	2054	only	-	Apr	 5	 3:00	-1:00	-
 Rule	Morocco	2054	only	-	May	17	 2:00	0	-
 Rule	Morocco	2055	only	-	Mar	28	 3:00	-1:00	-
 Rule	Morocco	2055	only	-	May	 2	 2:00	0	-
 Rule	Morocco	2056	only	-	Mar	12	 3:00	-1:00	-
 Rule	Morocco	2056	only	-	Apr	23	 2:00	0	-
 Rule	Morocco	2057	only	-	Mar	 4	 3:00	-1:00	-
 Rule	Morocco	2057	only	-	Apr	 8	 2:00	0	-
 Rule	Morocco	2058	only	-	Feb	17	 3:00	-1:00	-
 Rule	Morocco	2058	only	-	Mar	31	 2:00	0	-
 Rule	Morocco	2059	only	-	Feb	 9	 3:00	-1:00	-
 Rule	Morocco	2059	only	-	Mar	23	 2:00	0	-
 Rule	Morocco	2060	only	-	Feb	 1	 3:00	-1:00	-
 Rule	Morocco	2060	only	-	Mar	 7	 2:00	0	-
 Rule	Morocco	2061	only	-	Jan	16	 3:00	-1:00	-
 Rule	Morocco	2061	only	-	Feb	27	 2:00	0	-
 Rule	Morocco	2062	only	-	Jan	 8	 3:00	-1:00	-
 Rule	Morocco	2062	only	-	Feb	19	 2:00	0	-
 Rule	Morocco	2062	only	-	Dec	31	 3:00	-1:00	-
 Rule	Morocco	2063	only	-	Feb	 4	 2:00	0	-
 Rule	Morocco	2063	only	-	Dec	16	 3:00	-1:00	-
 Rule	Morocco	2064	only	-	Jan	27	 2:00	0	-
 Rule	Morocco	2064	only	-	Dec	 7	 3:00	-1:00	-
 Rule	Morocco	2065	only	-	Jan	11	 2:00	0	-
 Rule	Morocco	2065	only	-	Nov	22	 3:00	-1:00	-
 Rule	Morocco	2066	only	-	Jan	 3	 2:00	0	-
 Rule	Morocco	2066	only	-	Nov	14	 3:00	-1:00	-
 Rule	Morocco	2066	only	-	Dec	26	 2:00	0	-
 Rule	Morocco	2067	only	-	Nov	 6	 3:00	-1:00	-
 Rule	Morocco	2067	only	-	Dec	11	 2:00	0	-
 Rule	Morocco	2068	only	-	Oct	21	 3:00	-1:00	-
 Rule	Morocco	2068	only	-	Dec	 2	 2:00	0	-
 Rule	Morocco	2069	only	-	Oct	13	 3:00	-1:00	-
 Rule	Morocco	2069	only	-	Nov	24	 2:00	0	-
 Rule	Morocco	2070	only	-	Oct	 5	 3:00	-1:00	-
 Rule	Morocco	2070	only	-	Nov	 9	 2:00	0	-
 Rule	Morocco	2071	only	-	Sep	20	 3:00	-1:00	-
 Rule	Morocco	2071	only	-	Nov	 1	 2:00	0	-
 Rule	Morocco	2072	only	-	Sep	11	 3:00	-1:00	-
 Rule	Morocco	2072	only	-	Oct	16	 2:00	0	-
 Rule	Morocco	2073	only	-	Aug	27	 3:00	-1:00	-
 Rule	Morocco	2073	only	-	Oct	 8	 2:00	0	-
 Rule	Morocco	2074	only	-	Aug	19	 3:00	-1:00	-
 Rule	Morocco	2074	only	-	Sep	30	 2:00	0	-
 Rule	Morocco	2075	only	-	Aug	11	 3:00	-1:00	-
 Rule	Morocco	2075	only	-	Sep	15	 2:00	0	-
 Rule	Morocco	2076	only	-	Jul	26	 3:00	-1:00	-
 Rule	Morocco	2076	only	-	Sep	 6	 2:00	0	-
 Rule	Morocco	2077	only	-	Jul	18	 3:00	-1:00	-
 Rule	Morocco	2077	only	-	Aug	29	 2:00	0	-
 Rule	Morocco	2078	only	-	Jul	10	 3:00	-1:00	-
 Rule	Morocco	2078	only	-	Aug	14	 2:00	0	-
 Rule	Morocco	2079	only	-	Jun	25	 3:00	-1:00	-
 Rule	Morocco	2079	only	-	Aug	 6	 2:00	0	-
 Rule	Morocco	2080	only	-	Jun	16	 3:00	-1:00	-
 Rule	Morocco	2080	only	-	Jul	21	 2:00	0	-
 Rule	Morocco	2081	only	-	Jun	 1	 3:00	-1:00	-
 Rule	Morocco	2081	only	-	Jul	13	 2:00	0	-
 Rule	Morocco	2082	only	-	May	24	 3:00	-1:00	-
 Rule	Morocco	2082	only	-	Jul	 5	 2:00	0	-
 Rule	Morocco	2083	only	-	May	16	 3:00	-1:00	-
 Rule	Morocco	2083	only	-	Jun	20	 2:00	0	-
 Rule	Morocco	2084	only	-	Apr	30	 3:00	-1:00	-
 Rule	Morocco	2084	only	-	Jun	11	 2:00	0	-
 Rule	Morocco	2085	only	-	Apr	22	 3:00	-1:00	-
 Rule	Morocco	2085	only	-	Jun	 3	 2:00	0	-
 Rule	Morocco	2086	only	-	Apr	14	 3:00	-1:00	-
 Rule	Morocco	2086	only	-	May	19	 2:00	0	-
 Rule	Morocco	2087	only	-	Mar	30	 3:00	-1:00	-
 Rule	Morocco	2087	only	-	May	11	 2:00	0	-
 # For dates after the somewhat-arbitrary cutoff of 2087, assume that
 # Morocco will no longer observe DST.  At some point this table will
 # need to be extended, though quite possibly Morocco will change the
 # rules first.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Africa/Casablanca	-0:30:20 -	LMT	1913 Oct 26
 			 0:00	Morocco	+00/+01	1984 Mar 16
 			 1:00	-	+01	1986
 			 0:00	Morocco	+00/+01	2018 Oct 28  3:00
 			 1:00	Morocco	+01/+00
 
 # Western Sahara
 #
 # From Gwillim Law (2013-10-22):
 # A correspondent who is usually well informed about time zone matters
 # ... says that Western Sahara observes daylight saving time, just as
 # Morocco does.
 #
 # From Paul Eggert (2013-10-23):
 # Assume that this has been true since Western Sahara switched to GMT,
 # since most of it was then controlled by Morocco.
 
 Zone Africa/El_Aaiun	-0:52:48 -	LMT	1934 Jan # El Aaiún
 			-1:00	-	-01	1976 Apr 14
 			 0:00	Morocco	+00/+01	2018 Oct 28  3:00
 			 1:00	Morocco	+01/+00
 
 # Botswana
 # Burundi
 # Democratic Republic of the Congo (eastern)
 # Malawi
 # Mozambique
 # Rwanda
 # Zambia
 # Zimbabwe
 #
 # Shanks gives 1903-03-01 for the transition to CAT.
 # Perhaps the 1911-05-26 Portuguese decree
 # https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
 # merely made it official?
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Maputo	2:10:20 -	LMT	1903 Mar
 			2:00	-	CAT
 
 # Namibia
 
 # From Arthur David Olson (2017-08-09):
 # The text of the "Namibia Time Act, 1994" is available online at
 # www.lac.org.na/laws/1994/811.pdf
 # and includes this nugget:
 # Notwithstanding the provisions of subsection (2) of section 1, the
 # first winter period after the commencement of this Act shall
 # commence at OOhOO on Monday 21 March 1994 and shall end at 02h00 on
 # Sunday 4 September 1994.
 
 # From Michael Deckers (2017-04-06):
 # ... both summer and winter time are called "standard"
 # (which differs from the use in Ireland) ...
 
 # From Petronella Sibeene (2007-03-30):
 # http://allafrica.com/stories/200703300178.html
 # While the entire country changes its time, Katima Mulilo and other
 # settlements in Caprivi unofficially will not because the sun there
 # rises and sets earlier compared to other regions.  Chief of
 # Forecasting Riaan van Zyl explained that the far eastern parts of
 # the country are close to 40 minutes earlier in sunrise than the rest
 # of the country.
 #
 # From Paul Eggert (2017-02-22):
 # Although the Zambezi Region (formerly known as Caprivi) informally
 # observes Botswana time, we have no details about historical practice.
 # In the meantime people there can use Africa/Gaborone.
 # See: Immanuel S. The Namibian. 2017-02-23.
 # https://www.namibian.com.na/51480/read/Time-change-divides-lawmakers
 
 # From Steffen Thorsen (2017-08-09):
 # Namibia is going to change their time zone to what is now their DST:
 # https://www.newera.com.na/2017/02/23/namibias-winter-time-might-be-repealed/
 # This video is from the government decision:
 # https://www.nbc.na/news/na-passes-namibia-time-bill-repealing-1994-namibia-time-act.8665
 # We have made the assumption so far that they will change their time zone at
 # the same time they would normally start DST, the first Sunday in September:
 # https://www.timeanddate.com/news/time/namibia-new-time-zone.html
 
 # From Paul Eggert (2017-04-09):
 # Before the change, summer and winter time were both standard time legally.
 # However in common parlance, winter time was considered to be DST.  See, e.g.:
 # http://www.nbc.na/news/namibias-winter-time-could-be-scrapped.2706
 # https://zone.my.na/news/times-are-changing-in-namibia
 # https://www.newera.com.na/2017/02/23/namibias-winter-time-might-be-repealed/
 # Use plain "WAT" and "CAT" for the time zone abbreviations, to be compatible
 # with Namibia's neighbors.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Vanguard section, for zic and other parsers that support negative DST.
 Rule	Namibia	1994	only	-	Mar	21	0:00	-1:00	WAT
 Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	0	CAT
 Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	-1:00	WAT
 # Rearguard section, for parsers lacking negative DST; see ziguard.awk.
 #Rule	Namibia	1994	only	-	Mar	21	0:00	0	WAT
 #Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	1:00	CAT
 #Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	0	WAT
 # End of rearguard section.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Windhoek	1:08:24 -	LMT	1892 Feb 8
 			1:30	-	+0130	1903 Mar
 			2:00	-	SAST	1942 Sep 20  2:00
 			2:00	1:00	SAST	1943 Mar 21  2:00
 			2:00	-	SAST	1990 Mar 21 # independence
 # Vanguard section, for zic and other parsers that support negative DST.
 			2:00	Namibia	%s
 # Rearguard section, for parsers lacking negative DST; see ziguard.awk.
 #			2:00	-	CAT	1994 Mar 21  0:00
 # From Paul Eggert (2017-04-07):
 # The official date of the 2017 rule change was 2017-10-24.  See:
 # http://www.lac.org.na/laws/annoSTAT/Namibian%20Time%20Act%209%20of%202017.pdf
 #			1:00	Namibia	%s	2017 Oct 24
 #			2:00	-	CAT
 # End of rearguard section.
 
 
 # Angola
 # Benin
 # Cameroon
 # Central African Republic
 # Democratic Republic of the Congo (western)
 # Republic of the Congo
 # Equatorial Guinea
 # Gabon
 # Niger
 # Nigeria
 
 # From P Chan (2020-12-03):
 # GMT was adopted as the standard time of Lagos on 1905-07-01.
 # Lagos Weekly Record, 1905-06-24, p 3
 # http://ddsnext.crl.edu/titles/31558#?c=0&m=668&s=0&cv=2&r=0&xywh=1446%2C5221%2C1931%2C1235
 # says "It is officially notified that on and after the 1st of July 1905
 # Greenwich Mean Solar Time will be adopted thought the Colony and
 # Protectorate, and that it will be necessary to put all clocks 13 minutes and
 # 35 seconds back, recording local mean time."
 #
 # It seemed that Lagos returned to LMT on 1908-07-01.
 # [The Lagos Standard], 1908-07-01, p 5
 # http://ddsnext.crl.edu/titles/31556#?c=0&m=78&s=0&cv=4&r=0&xywh=-92%2C3590%2C3944%2C2523
 # says "Scarcely have the people become accustomed to this new time, when
 # another official notice has now appeared announcing that from and after the
 # 1st July next, return will be made to local mean time."
 #
 # From P Chan (2020-11-27):
 # On 1914-01-01, standard time of GMT+0:30 was adopted for the unified Nigeria.
 # Colonial Reports - Annual. No. 878. Nigeria. Report for 1914. (April 1916),
 # p 27
 # https://libsysdigi.library.illinois.edu/ilharvest/Africana/Books2011-05/3064634/3064634_1914/3064634_1914_opt.pdf#page=27
 # "On January 1st [1914], a universal standard time for Nigeria was adopted,
 # viz., half an hour fast on Greenwich mean time, corresponding to the meridian
 # 7 [degrees] 30' E. long."
 # Lloyd's Register of Shipping (1915) says "Hitherto the time observed in Lagos
 # was the local mean time. On 1st January, 1914, standard time for the whole of
 # Nigeria was introduced ... Lagos time has been advanced about 16 minutes
 # accordingly."
 #
 # In 1919, standard time was changed to GMT+1.
 # Interpretation Ordinance (Cap 2)
 # The Laws of Nigeria, Containing the Ordinances of Nigeria, in Force on the
 # 1st Day of January, 1923, Vol.I [p 16]
 # https://books.google.com/books?id=BOMrAQAAMAAJ&pg=PA16
 # "The expression 'Standard time' means standard time as used in Nigeria:
 # namely, 60 minutes in advance of Greenwich mean time.  (As amended by 18 of
 # 1919, s. 2.)"
 # From Tim Parenti (2020-12-10):
 # The Lagos Weekly Record, 1919-09-20, p 3 details discussion on the first
 # reading of this Bill by the Legislative Council of the Colony of Nigeria on
 # Thursday 1919-08-28:
 # http://ddsnext.crl.edu/titles/31558?terms&item_id=303484#?m=1118&c=1&s=0&cv=2&r=0&xywh=1261%2C3408%2C2994%2C1915
 # "The proposal is that the Globe should be divided into twelve zones East and
 # West of Greenwich, of one hour each, Nigeria falling into the zone with a
 # standard of one hour fast on Greenwich Mean Time.  Nigeria standard time is
 # now 30 minutes in advance of Greenwich Mean Time ... according to the new
 # proposal, standard time will be advanced another 30 minutes".  It was further
 # proposed that the firing of the time guns likewise be adjusted by 30 minutes
 # to compensate.
 # From Tim Parenti (2020-12-10), per P Chan (2020-12-11):
 # The text of Ordinance 18 of 1919, published in Nigeria Gazette, Vol 6, No 52,
 # shows that the change was assented to the following day and took effect "on
 # the 1st day of September, 1919."
 # Nigeria Gazette and Supplements 1919 Jan-Dec, Reference: 73266B-40,
 # img 245-246
 # https://microform.digital/boa/collections/77/volumes/539/nigeria-lagos-1887-1919
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Lagos	0:13:35 -	LMT	1905 Jul  1
 			0:00	-	GMT	1908 Jul  1
 			0:13:35	-	LMT	1914 Jan  1
 			0:30	-	+0030	1919 Sep  1
 			1:00	-	WAT
 
 # São Tomé and Príncipe
 
 # See Europe/Lisbon for info about the 1912 transition.
 
 # From Steffen Thorsen (2018-01-08):
 # Multiple sources tell that São Tomé changed from UTC to UTC+1 as
 # they entered the year 2018.
 # From Michael Deckers (2018-01-08):
 # the switch is from 01:00 to 02:00 ... [Decree No. 25/2017]
 # http://www.mnec.gov.st/index.php/publicacoes/documentos/file/90-decreto-lei-n-25-2017
 
 # From Vadim Nasardinov (2018-12-29):
 # São Tomé and Príncipe is about to do the following on Jan 1, 2019:
 # https://www.stp-press.st/2018/12/05/governo-jesus-ja-decidiu-repor-hora-legal-sao-tomense/
 #
 # From Michael Deckers (2018-12-30):
 # https://www.legis-palop.org/download.jsp?idFile=102818
 # ... [The legal time of the country, which coincides with universal
 # coordinated time, will be reinstituted at 2 o'clock on day 1 of January, 2019.]
 
 Zone	Africa/Sao_Tome	 0:26:56 -	LMT	1884
 		#STDOFF	-0:36:44.68
 			-0:36:45 -	LMT	1912 Jan  1 00:00u # Lisbon MT
 			 0:00	-	GMT	2018 Jan  1 01:00
 			 1:00	-	WAT	2019 Jan  1 02:00
 			 0:00	-	GMT
 
 # Eswatini (Swaziland)
 # Lesotho
 # South Africa
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	SA	1942	1943	-	Sep	Sun>=15	2:00	1:00	-
 Rule	SA	1943	1944	-	Mar	Sun>=15	2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Africa/Johannesburg 1:52:00 -	LMT	1892 Feb 8
 			1:30	-	SAST	1903 Mar
 			2:00	SA	SAST
 #
 # Marion and Prince Edward Is
 # scientific station since 1947
 # no information
 
 # Sudan
 
 # From 
 # Sudan News Agency (2000-01-13),
 # also reported by Michaël De Beukelaer-Dossche via Steffen Thorsen:
 # Clocks will be moved ahead for 60 minutes all over the Sudan as of noon
 # Saturday....  This was announced Thursday by Caretaker State Minister for
 # Manpower Abdul-Rahman Nur-Eddin.
 
 # From Ahmed Atyya, National Telecommunications Corp. (NTC), Sudan (2017-10-17):
 # ... the Republic of Sudan is going to change the time zone from (GMT+3:00)
 # to (GMT+ 2:00) starting from Wednesday 1 November 2017.
 #
 # From Paul Eggert (2017-10-18):
 # A scanned copy (in Arabic) of Cabinet Resolution No. 352 for the
 # year 2017 can be found as an attachment in email today from Yahia
 # Abdalla of NTC, archived at:
 # https://mm.icann.org/pipermail/tz/2017-October/025333.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Sudan	1970	only	-	May	 1	0:00	1:00	S
 Rule	Sudan	1970	1985	-	Oct	15	0:00	0	-
 Rule	Sudan	1971	only	-	Apr	30	0:00	1:00	S
 Rule	Sudan	1972	1985	-	Apr	lastSun	0:00	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Khartoum	2:10:08 -	LMT	1931
 			2:00	Sudan	CA%sT	2000 Jan 15 12:00
 			3:00	-	EAT	2017 Nov  1
 			2:00	-	CAT
 
 # South Sudan
 
 # From Steffen Thorsen (2021-01-18):
 # "South Sudan will change its time zone by setting the clock back 1
 # hour on February 1, 2021...."
 # from https://eyeradio.org/south-sudan-adopts-new-time-zone-makuei/
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Juba	2:06:28 -	LMT	1931
 			2:00	Sudan	CA%sT	2000 Jan 15 12:00
 			3:00	-	EAT	2021 Feb  1 00:00
 			2:00	-	CAT
 
 # Tunisia
 
 # From Gwillim Law (2005-04-30):
 # My correspondent, Risto Nykänen, has alerted me to another adoption of DST,
 # this time in Tunisia.  According to Yahoo France News
 # , in a story attributed to AP
 # and dated 2005-04-26, "Tunisia has decided to advance its official time by
 # one hour, starting on Sunday, May 1.  Henceforth, Tunisian time will be
 # UTC+2 instead of UTC+1.  The change will take place at 23:00 UTC next
 # Saturday."  (My translation)
 #
 # From Oscar van Vlijmen (2005-05-02):
 # La Presse, the first national daily newspaper ...
 # http://www.lapresse.tn/archives/archives280405/actualites/lheure.html
 # ... DST for 2005: on: Sun May 1 0h standard time, off: Fri Sept. 30,
 # 1h standard time.
 #
 # From Atef Loukil (2006-03-28):
 # The daylight saving time will be the same each year:
 # Beginning      : the last Sunday of March at 02:00
 # Ending         : the last Sunday of October at 03:00 ...
 # http://www.tap.info.tn/en/index.php?option=com_content&task=view&id=1188&Itemid=50
 
 # From Steffen Thorsen (2009-03-16):
 # According to several news sources, Tunisia will not observe DST this year.
 # (Arabic)
 # http://www.elbashayer.com/?page=viewn&nid=42546
 # https://www.babnet.net/kiwidetail-15295.asp
 #
 # We have also confirmed this with the US embassy in Tunisia.
 # We have a wrap-up about this on the following page:
 # https://www.timeanddate.com/news/time/tunisia-cancels-dst-2009.html
 
 # From Alexander Krivenyshev (2009-03-17):
 # Here is a link to Tunis Afrique Presse News Agency
 #
 # Standard time to be kept the whole year long (tap.info.tn):
 #
 # (in English)
 # http://www.tap.info.tn/en/index.php?option=com_content&task=view&id=26813&Itemid=157
 #
 # (in Arabic)
 # http://www.tap.info.tn/ar/index.php?option=com_content&task=view&id=61240&Itemid=1
 
 # From Arthur David Olson (2009-03-18):
 # The Tunis Afrique Presse News Agency notice contains this: "This measure is
 # due to the fact that the fasting month of Ramadan coincides with the period
 # concerned by summer time.  Therefore, the standard time will be kept
 # unchanged the whole year long."  So foregoing DST seems to be an exception
 # (albeit one that may be repeated in the future).
 
 # From Alexander Krivenyshev (2010-03-27):
 # According to some news reports Tunis confirmed not to use DST in 2010
 #
 # (translation):
 # "The Tunisian government has decided to abandon DST, which was scheduled on
 # Sunday...
 # Tunisian authorities had suspended the DST for the first time last year also
 # coincided with the month of Ramadan..."
 #
 # (in Arabic)
 # http://www.moheet.com/show_news.aspx?nid=358861&pg=1
 # http://www.almadenahnews.com/newss/news.php?c=118&id=38036
 # http://www.worldtimezone.com/dst_news/dst_news_tunis02.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Tunisia	1939	only	-	Apr	15	23:00s	1:00	S
 Rule	Tunisia	1939	only	-	Nov	18	23:00s	0	-
 Rule	Tunisia	1940	only	-	Feb	25	23:00s	1:00	S
 Rule	Tunisia	1941	only	-	Oct	 6	 0:00	0	-
 Rule	Tunisia	1942	only	-	Mar	 9	 0:00	1:00	S
 Rule	Tunisia	1942	only	-	Nov	 2	 3:00	0	-
 Rule	Tunisia	1943	only	-	Mar	29	 2:00	1:00	S
 Rule	Tunisia	1943	only	-	Apr	17	 2:00	0	-
 Rule	Tunisia	1943	only	-	Apr	25	 2:00	1:00	S
 Rule	Tunisia	1943	only	-	Oct	 4	 2:00	0	-
 Rule	Tunisia	1944	1945	-	Apr	Mon>=1	 2:00	1:00	S
 Rule	Tunisia	1944	only	-	Oct	 8	 0:00	0	-
 Rule	Tunisia	1945	only	-	Sep	16	 0:00	0	-
 Rule	Tunisia	1977	only	-	Apr	30	 0:00s	1:00	S
 Rule	Tunisia	1977	only	-	Sep	24	 0:00s	0	-
 Rule	Tunisia	1978	only	-	May	 1	 0:00s	1:00	S
 Rule	Tunisia	1978	only	-	Oct	 1	 0:00s	0	-
 Rule	Tunisia	1988	only	-	Jun	 1	 0:00s	1:00	S
 Rule	Tunisia	1988	1990	-	Sep	lastSun	 0:00s	0	-
 Rule	Tunisia	1989	only	-	Mar	26	 0:00s	1:00	S
 Rule	Tunisia	1990	only	-	May	 1	 0:00s	1:00	S
 Rule	Tunisia	2005	only	-	May	 1	 0:00s	1:00	S
 Rule	Tunisia	2005	only	-	Sep	30	 1:00s	0	-
 Rule	Tunisia	2006	2008	-	Mar	lastSun	 2:00s	1:00	S
 Rule	Tunisia	2006	2008	-	Oct	lastSun	 2:00s	0	-
 
 # See Europe/Paris commentary for PMT-related transitions.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Tunis	0:40:44 -	LMT	1881 May 12
 			0:09:21	-	PMT	1911 Mar 11 # Paris Mean Time
 			1:00	Tunisia	CE%sT
diff --git a/asia b/asia
index 6e8ad282ee61..199e6ad6adc3 100644
--- a/asia
+++ b/asia
@@ -1,3955 +1,3955 @@
 # tzdb data for Asia and environs
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # This file is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
 # From Paul Eggert (2019-07-11):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 #
 # Many years ago Gwillim Law wrote that a good source
 # for time zone data was the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
 # of the IATA's data after 1990.  Except where otherwise noted,
 # IATA SSIM is the source for entries after 1990.
 #
 # Another source occasionally used is Edward W. Whitman, World Time Differences,
 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
 # I found in the UCLA library.
 #
 # For data circa 1899, a common source is:
 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
 # https://www.jstor.org/stable/1774359
 #
 # For Russian data circa 1919, a source is:
 # Byalokoz EL. New Counting of Time in Russia since July 1, 1919.
 # (See the 'europe' file for a fuller citation.)
 #
 # The following alphabetic abbreviations appear in these tables
 # (corrections are welcome):
 #	     std  dst
 #	     LMT	Local Mean Time
 #	2:00 EET  EEST	Eastern European Time
 #	2:00 IST  IDT	Israel
 #	5:30 IST	India
 #	7:00 WIB	west Indonesia (Waktu Indonesia Barat)
 #	8:00 WITA	central Indonesia (Waktu Indonesia Tengah)
 #	8:00 CST	China
 #	8:00 HKT  HKST	Hong Kong (HKWT* for Winter Time in late 1941)
 #	8:00 PST  PDT*	Philippines
 #	8:30 KST  KDT	Korea when at +0830
 #	9:00 WIT	east Indonesia (Waktu Indonesia Timur)
 #	9:00 JST  JDT	Japan
 #	9:00 KST  KDT	Korea when at +09
 # *I invented the abbreviations HKWT and PDT; see below.
 # Otherwise, these tables typically use numeric abbreviations like +03
 # and +0330 for integer hour and minute UT offsets.  Although earlier
 # editions invented alphabetic time zone abbreviations for every
 # offset, this did not reflect common practice.
 #
 # See the 'europe' file for Russia and Turkey in Asia.
 
 # From Guy Harris:
 # Incorporates data for Singapore from Robert Elz' asia 1.1, as well as
 # additional information from Tom Yap, Sun Microsystems Intercontinental
 # Technical Support (including a page from the Official Airline Guide -
 # Worldwide Edition).
 
 ###############################################################################
 
 # These rules are stolen from the 'europe' file.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	EUAsia	1981	max	-	Mar	lastSun	 1:00u	1:00	S
 Rule	EUAsia	1979	1995	-	Sep	lastSun	 1:00u	0	-
 Rule	EUAsia	1996	max	-	Oct	lastSun	 1:00u	0	-
 Rule E-EurAsia	1981	max	-	Mar	lastSun	 0:00	1:00	-
 Rule E-EurAsia	1979	1995	-	Sep	lastSun	 0:00	0	-
 Rule E-EurAsia	1996	max	-	Oct	lastSun	 0:00	0	-
 Rule RussiaAsia	1981	1984	-	Apr	1	 0:00	1:00	-
 Rule RussiaAsia	1981	1983	-	Oct	1	 0:00	0	-
 Rule RussiaAsia	1984	1995	-	Sep	lastSun	 2:00s	0	-
 Rule RussiaAsia	1985	2010	-	Mar	lastSun	 2:00s	1:00	-
 Rule RussiaAsia	1996	2010	-	Oct	lastSun	 2:00s	0	-
 
 # Afghanistan
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Kabul	4:36:48 -	LMT	1890
 			4:00	-	+04	1945
 			4:30	-	+0430
 
 # Armenia
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger have Yerevan switching to 3:00 (with Russian DST)
 # in spring 1991, then to 4:00 with no DST in fall 1995, then
 # readopting Russian DST in 1997.  Go with Shanks & Pottenger, even
 # when they disagree with others.  Edgar Der-Danieliantz
 # reported (1996-05-04) that Yerevan probably wouldn't use DST
 # in 1996, though it did use DST in 1995.  IATA SSIM (1991/1998) reports that
 # Armenia switched from 3:00 to 4:00 in 1998 and observed DST after 1991,
 # but started switching at 3:00s in 1998.
 
 # From Arthur David Olson (2011-06-15):
 # While Russia abandoned DST in 2011, Armenia may choose to
 # follow Russia's "old" rules.
 
 # From Alexander Krivenyshev (2012-02-10):
 # According to News Armenia, on Feb 9, 2012,
 # http://newsarmenia.ru/society/20120209/42609695.html
 #
 # The Armenia National Assembly adopted final reading of Amendments to the
 # Law "On procedure of calculation time on the territory of the Republic of
 # Armenia" according to which Armenia [is] abolishing Daylight Saving Time.
 # or
 # (brief)
 # http://www.worldtimezone.com/dst_news/dst_news_armenia03.html
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule Armenia	2011	only	-	Mar	lastSun	 2:00s	1:00	-
 Rule Armenia	2011	only	-	Oct	lastSun	 2:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Yerevan	2:58:00 -	LMT	1924 May  2
 			3:00	-	+03	1957 Mar
 			4:00 RussiaAsia +04/+05	1991 Mar 31  2:00s
 			3:00 RussiaAsia	+03/+04	1995 Sep 24  2:00s
 			4:00	-	+04	1997
 			4:00 RussiaAsia	+04/+05	2011
 			4:00	Armenia	+04/+05
 
 # Azerbaijan
 
 # From Rustam Aliyev of the Azerbaijan Internet Forum (2005-10-23):
 # According to the resolution of Cabinet of Ministers, 1997
 # From Paul Eggert (2015-09-17): It was Resolution No. 21 (1997-03-17).
 # http://code.az/files/daylight_res.pdf
 
 # From Steffen Thorsen (2016-03-17):
 # ... the Azerbaijani Cabinet of Ministers has cancelled switching to
 # daylight saving time....
 # https://www.azernews.az/azerbaijan/94137.html
 # http://vestnikkavkaza.net/news/Azerbaijani-Cabinet-of-Ministers-cancels-daylight-saving-time.html
 # http://en.apa.az/xeber_azerbaijan_abolishes_daylight_savings_ti_240862.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Azer	1997	2015	-	Mar	lastSun	 4:00	1:00	-
 Rule	Azer	1997	2015	-	Oct	lastSun	 5:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Baku	3:19:24 -	LMT	1924 May  2
 			3:00	-	+03	1957 Mar
 			4:00 RussiaAsia +04/+05	1991 Mar 31  2:00s
 			3:00 RussiaAsia	+03/+04	1992 Sep lastSun  2:00s
 			4:00	-	+04	1996
 			4:00	EUAsia	+04/+05	1997
 			4:00	Azer	+04/+05
 
 # Bangladesh
 # From Alexander Krivenyshev (2009-05-13):
 # According to newspaper Asian Tribune (May 6, 2009) Bangladesh may introduce
 # Daylight Saving Time from June 16 to Sept 30
 #
 # Bangladesh to introduce daylight saving time likely from June 16
 # http://www.asiantribune.com/?q=node/17288
 # http://www.worldtimezone.com/dst_news/dst_news_bangladesh02.html
 #
 # "... Bangladesh government has decided to switch daylight saving time from
 # June
 # 16 till September 30 in a bid to ensure maximum use of daylight to cope with
 # crippling power crisis. "
 #
 # The switch will remain in effect from June 16 to Sept 30 (2009) but if
 # implemented the next year, it will come in force from April 1, 2010
 
 # From Steffen Thorsen (2009-06-02):
 # They have finally decided now, but changed the start date to midnight between
 # the 19th and 20th, and they have not set the end date yet.
 #
 # Some sources:
 # https://in.reuters.com/article/southAsiaNews/idINIndia-40017620090601
 # http://bdnews24.com/details.php?id=85889&cid=2
 #
 # Our wrap-up:
 # https://www.timeanddate.com/news/time/bangladesh-daylight-saving-2009.html
 
 # From A. N. M. Kamrus Saadat (2009-06-15):
 # Finally we've got the official mail regarding DST start time where DST start
 # time is mentioned as Jun 19 2009, 23:00 from BTRC (Bangladesh
 # Telecommunication Regulatory Commission).
 #
 # No DST end date has been announced yet.
 
 # From Alexander Krivenyshev (2009-09-25):
 # Bangladesh won't go back to Standard Time from October 1, 2009,
 # instead it will continue DST measure till the cabinet makes a fresh decision.
 #
 # Following report by same newspaper-"The Daily Star Friday":
 # "DST change awaits cabinet decision-Clock won't go back by 1-hr from Oct 1"
 # http://www.thedailystar.net/newDesign/news-details.php?nid=107021
 # http://www.worldtimezone.com/dst_news/dst_news_bangladesh04.html
 
 # From Steffen Thorsen (2009-10-13):
 # IANS (Indo-Asian News Service) now reports:
 # Bangladesh has decided that the clock advanced by an hour to make
 # maximum use of daylight hours as an energy saving measure would
 # "continue for an indefinite period."
 #
 # One of many places where it is published:
 # http://www.thaindian.com/newsportal/business/bangladesh-to-continue-indefinitely-with-advanced-time_100259987.html
 
 # From Alexander Krivenyshev (2009-12-24):
 # According to Bangladesh newspaper "The Daily Star,"
 # Bangladesh will change its clock back to Standard Time on Dec 31, 2009.
 #
 # Clock goes back 1-hr on Dec 31 night.
 # http://www.thedailystar.net/newDesign/news-details.php?nid=119228
 # http://www.worldtimezone.com/dst_news/dst_news_bangladesh05.html
 #
 # "...The government yesterday decided to put the clock back by one hour
 # on December 31 midnight and the new time will continue until March 31,
 # 2010 midnight. The decision came at a cabinet meeting at the Prime
 # Minister's Office last night..."
 
 # From Alexander Krivenyshev (2010-03-22):
 # According to Bangladesh newspaper "The Daily Star,"
 # Cabinet cancels Daylight Saving Time
 # http://www.thedailystar.net/newDesign/latest_news.php?nid=22817
 # http://www.worldtimezone.com/dst_news/dst_news_bangladesh06.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Dhaka	2009	only	-	Jun	19	23:00	1:00	-
 Rule	Dhaka	2009	only	-	Dec	31	24:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Dhaka	6:01:40 -	LMT	1890
 			5:53:20	-	HMT	1941 Oct    # Howrah Mean Time?
 			6:30	-	+0630	1942 May 15
 			5:30	-	+0530	1942 Sep
 			6:30	-	+0630	1951 Sep 30
 			6:00	-	+06	2009
 			6:00	Dhaka	+06/+07
 
 # Bhutan
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Thimphu	5:58:36 -	LMT	1947 Aug 15 # or Thimbu
 			5:30	-	+0530	1987 Oct
 			6:00	-	+06
 
 # British Indian Ocean Territory
 # Whitman and the 1995 CIA time zone map say 5:00, but the
 # 1997 and later maps say 6:00.  Assume the switch occurred in 1996.
 # We have no information as to when standard time was introduced;
 # assume it occurred in 1907, the same year as Mauritius (which
 # then contained the Chagos Archipelago).
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Indian/Chagos	4:49:40	-	LMT	1907
 			5:00	-	+05	1996
 			6:00	-	+06
 
 # Cocos (Keeling) Islands
 # Myanmar (Burma)
 
 # Milne says 6:24:40 was the meridian of the time ball observatory at Rangoon.
 
 # From Paul Eggert (2017-04-20):
 # Page 27 of Reed & Low (cited for Asia/Kolkata) says "Rangoon local time is
 # used upon the railways and telegraphs of Burma, and is 6h. 24m. 47s. ahead
 # of Greenwich."  This refers to the period before Burma's transition to +0630,
 # a transition for which Shanks is the only source.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Yangon	6:24:47 -	LMT	1880        # or Rangoon
 			6:24:47	-	RMT	1920        # Rangoon local time
 			6:30	-	+0630	1942 May
 			9:00	-	+09	1945 May  3
 			6:30	-	+0630
 
 # China
 
 # From Phake Nick (2020-04-15):
 # According to this news report:
 # http://news.sina.com.cn/c/2004-09-01/19524201403.shtml
 # on April 11, 1919, newspaper in Shanghai said clocks in Shanghai will spring
 # forward for an hour starting from midnight of that Saturday. The report did
 # not mention what happened in Shanghai thereafter, but it mentioned that a
 # similar trial in Tianjin which ended at October 1st as citizens are told to
 # recede the clock on September 30 from 12:00pm to 11:00pm. The trial at
 # Tianjin got terminated in 1920.
 #
 # From Paul Eggert (2020-04-15):
 # The Returns of Trade and Trade Reports, page 711, says "Daylight saving was
 # given a trial during the year, and from the 12th April to the 1st October
 # the clocks were all set one hour ahead of sun time.  Though the scheme was
 # generally esteemed a success, it was announced early in 1920 that it would
 # not be repeated."
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Shang	1919	only	-	Apr	12	24:00	1:00	D
 Rule	Shang	1919	only	-	Sep	30	24:00	0	S
 
 # From Paul Eggert (2018-10-02):
 # The following comes from Table 1 of:
 # Li Yu. Research on the daylight saving movement in 1940s Shanghai.
 # Nanjing Journal of Social Sciences. 2014;(2):144-50.
 # http://oversea.cnki.net/kns55/detail.aspx?dbname=CJFD2014&filename=NJSH201402020
 # The table lists dates only; I am guessing 00:00 and 24:00 transition times.
 # Also, the table lists the planned end of DST in 1949, but the corresponding
 # zone line cuts this off on May 28, when the Communists took power.
 
 # From Phake Nick (2020-04-15):
 #
 # For the history of time in Shanghai between 1940-1942, the situation is
 # actually slightly more complex than the table [below]....  At the time,
 # there were three different authorities in Shanghai, including Shanghai
 # International Settlement, a settlement established by western countries with
 # its own westernized form of government, Shanghai French Concession, similar
 # to the international settlement but is controlled by French, and then the
 # rest of the city of Shanghai, which have already been controlled by Japanese
 # force through a puppet local government (Wang Jingwei regime).  It was
 # additionally complicated by the circumstances that, according to the 1940s
 # Shanghai summer time essay cited in the database, some
 # departments/businesses/people in the Shanghai city itself during that time
 # period, refused to change their clock and instead only changed their opening
 # hours.
 #
 # For example, as quoted in the article, in 1940, other than the authority
 # itself, power, tram, bus companies, cinema, department stores, and other
 # public service organizations have all decided to follow the summer time and
 # spring forward the clock.  On the other hand, the custom office refused to
 # spring forward the clock because of worry on mechanical wear to the physical
 # clock, postal office refused to spring forward because of disruption to
 # business and log-keeping, although they did changed their office hour to
 # match rest of the city.  So is travel agents, and also weather
 # observatory.  It is said both time standards had their own supporters in the
 # city at the time, those who prefer new time standard would have moved their
 # clock while those who prefer the old time standard would keep their clock
 # unchange, and there were different clocks that use different time standard
 # in the city at the time for people who use different time standard to adjust
 # their clock to their preferred time.
 #
 # a. For the 1940 May 31 spring forward, the essay [says] ... "Hong
 # Kong government implemented the spring forward in the same time on
 # the same date as Shanghai".
 #
 # b. For the 1940 fall back, it was said that they initially intended to do
 # so on September 30 00:59 at night, however they postponed it to October 12
 # after discussion with relevant parties. However schools restored to the
 # original schedule ten days earlier.
 #
 # c. For the 1941 spring forward, it is said to start from March 15
 # "following the previous year's method", and in addition to that the essay
 # cited an announcement in 1941 from the Wang regime which said the Special
 # City of Shanghai under Wang regime control will follow the DST rule set by
 # the Settlements, irrespective of the original DST plan announced by the Wang
 # regime for other area under its control(April 1 to September 30). (no idea
 # to situation before that announcement)
 #
 # d. For the 1941 fall back, it was said that the fall back would occurs at
 # the end of September (A newspaper headline cited by the essay, published on
 # October 1, 1941, have the headlines which said "French Concession would
 # rewind to the old clock this morning), but it ultimately didn't happen due
 # to disagreement between the international settlement authority and the
 # French concession authority, and the fall back ultimately occurred on
 # November 1.
 #
 # e. In 1941 December, Japan have officially started war with the United
 # States and the United Kingdom, and in Shanghai they have marched into the
 # international settlement, taken over its control
 #
 # f. For the 1942 spring forward, the essay said that the spring forward
 # started on January 31. It said this time the custom office and postal
 # department will also change their clocks, unlike before.
 #
 # g. The essay itself didn't cover any specific changes thereafter until the
 # end of the war, it quoted a November 1942 command from the government of the
 # Wang regime, which claim the daylight saving time applies year round during
 # the war. However, the essay ambiguously said the period is "February 1 to
 # September 30", which I don't really understand what is the meaning of such
 # period in the context of year round implementation here.. More researches
 # might be needed to show exactly what happened during that period of time.
 
 # From Phake Nick (2020-04-15):
 # According to a Japanese tour bus pamphlet in Nanjing area believed to be
 # from around year 1941: http://www.tt-museum.jp/tairiku_0280_nan1941.html ,
 # the schedule listed was in the format of Japanese time.  Which indicate some
 # use of the Japanese time (instead of syncing by DST) might have occurred in
 # the Yangtze river delta area during that period of time although the scope
 # of such use will need to be investigated to determine.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Shang	1940	only	-	Jun	 1	 0:00	1:00	D
 Rule	Shang	1940	only	-	Oct	12	24:00	0	S
 Rule	Shang	1941	only	-	Mar	15	 0:00	1:00	D
 Rule	Shang	1941	only	-	Nov	 1	24:00	0	S
 Rule	Shang	1942	only	-	Jan	31	 0:00	1:00	D
 Rule	Shang	1945	only	-	Sep	 1	24:00	0	S
 Rule	Shang	1946	only	-	May	15	 0:00	1:00	D
 Rule	Shang	1946	only	-	Sep	30	24:00	0	S
 Rule	Shang	1947	only	-	Apr	15	 0:00	1:00	D
 Rule	Shang	1947	only	-	Oct	31	24:00	0	S
 Rule	Shang	1948	1949	-	May	 1	 0:00	1:00	D
 Rule	Shang	1948	1949	-	Sep	30	24:00	0	S #plan
 
 # From Guy Harris:
 # People's Republic of China.  Yes, they really have only one time zone.
 
 # From Bob Devine (1988-01-28):
 # No they don't.  See TIME mag, 1986-02-17 p.52.  Even though
 # China is across 4 physical time zones, before Feb 1, 1986 only the
 # Peking (Beijing) time zone was recognized.  Since that date, China
 # has two of 'em - Peking's and Ürümqi (named after the capital of
 # the Xinjiang Uyghur Autonomous Region).  I don't know about DST for it.
 #
 # . . .I just deleted the DST table and this editor makes it too
 # painful to suck in another copy.  So, here is what I have for
 # DST start/end dates for Peking's time zone (info from AP):
 #
 #     1986 May 4 - Sept 14
 #     1987 mid-April - ??
 
 # From U. S. Naval Observatory (1989-01-19):
 # CHINA               8 H  AHEAD OF UTC  ALL OF CHINA, INCL TAIWAN
 # CHINA               9 H  AHEAD OF UTC  APR 17 - SEP 10
 
 # From Paul Eggert (2008-02-11):
 # Jim Mann, "A clumsy embrace for another western custom: China on daylight
 # time - sort of", Los Angeles Times, 1986-05-05 ... [says] that China began
 # observing daylight saving time in 1986.
 
 # From P Chan (2018-05-07):
 # The start and end time of DST in China [from 1986 on] should be 2:00
 # (i.e. 2:00 to 3:00 at the start and 2:00 to 1:00 at the end)....
 # Government notices about summer time:
 #
 # 1986-04-12 http://www.zj.gov.cn/attach/zfgb/198608.pdf p.21-22
 # (To establish summer time from 1986. On 4 May, set the clocks ahead one hour
 # at 2 am. On 14 September, set the clocks backward one hour at 2 am.)
 #
 # 1987-02-15 http://www.gov.cn/gongbao/shuju/1987/gwyb198703.pdf p.114
 # (Summer time in 1987 to start from 12 April until 13 September)
 #
 # 1987-09-09 http://www.gov.cn/gongbao/shuju/1987/gwyb198721.pdf p.709
 # (From 1988, summer time to start from 2 am of the first Sunday of mid-April
 # until 2 am of the first Sunday of mid-September)
 #
 # 1992-03-03 http://www.gov.cn/gongbao/shuju/1992/gwyb199205.pdf p.152
 # (To suspend summer time from 1992)
 #
 # The first page of People's Daily on 12 April 1988 stating that summer time
 # to begin on 17 April.
 # http://data.people.com.cn/pic/101p/1988/04/1988041201.jpg
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	PRC	1986	only	-	May	 4	 2:00	1:00	D
 Rule	PRC	1986	1991	-	Sep	Sun>=11	 2:00	0	S
 Rule	PRC	1987	1991	-	Apr	Sun>=11	 2:00	1:00	D
 
 # From Anthony Fok (2001-12-20):
 # BTW, I did some research on-line and found some info regarding these five
 # historic timezones from some Taiwan websites.  And yes, there are official
 # Chinese names for these locales (before 1949).
 #
 # From Jesper Nørgaard Welen (2006-07-14):
 # I have investigated the timezones around 1970 on the
 # https://www.astro.com/atlas site [with provinces and county
 # boundaries summarized below]....  A few other exceptions were two
 # counties on the Sichuan side of the Xizang-Sichuan border,
 # counties Dege and Baiyu which lies on the Sichuan side and are
 # therefore supposed to be GMT+7, Xizang region being GMT+6, but Dege
 # county is GMT+8 according to astro.com while Baiyu county is GMT+6
 # (could be true), for the moment I am assuming that those two
 # counties are mistakes in the astro.com data.
 
 # From Paul Eggert (2017-01-05):
 # Alois Treindl kindly sent me translations of the following two sources:
 #
 # (1)
 # Guo Qing-sheng (National Time-Service Center, CAS, Xi'an 710600, China)
 # Beijing Time at the Beginning of the PRC
 # China Historical Materials of Science and Technology
 # (Zhongguo ke ji shi liao, 中国科技史料). 2003;24(1):5-9.
 # http://oversea.cnki.net/kcms/detail/detail.aspx?filename=ZGKS200301000&dbname=CJFD2003
 # It gives evidence that at the beginning of the PRC, Beijing time was
 # officially apparent solar time!  However, Guo also says that the
 # evidence is dubious, as the relevant institute of astronomy had not
 # been taken over by the PRC yet.  It's plausible that apparent solar
 # time was announced but never implemented, and that people continued
 # to use UT+8.  As the Shanghai radio station (and I presume the
 # observatory) was still under control of French missionaries, it
 # could well have ignored any such mandate.
 #
 # (2)
 # Guo Qing-sheng (Shaanxi Astronomical Observatory, CAS, Xi'an 710600, China)
 # A Study on the Standard Time Changes for the Past 100 Years in China
 # [undated and unknown publication location]
 # It says several things:
 #   * The Qing dynasty used local apparent solar time throughout China.
 #   * The Republic of China instituted Beijing mean solar time effective
 #     the official calendar book of 1914.
 #   * The French Concession in Shanghai set up signal stations in
 #     French docks in the 1890s, controlled by Xujiahui (Zikawei)
 #     Observatory and set to local mean time.
 #   * "From the end of the 19th century" it changed to UT+8.
 #   * Chinese Customs (by then reduced to a tool of foreign powers)
 #     eventually standardized on this time for all ports, and it
 #     became used by railways as well.
 #   * In 1918 the Central Observatory proposed dividing China into
 #     five time zones (see below for details).  This caught on
 #     at first only in coastal areas observing UT+8.
 #   * During WWII all of China was in theory was at UT+7.  In practice
 #     this was ignored in the west, and I presume was ignored in
 #     Japanese-occupied territory.
 #   * Japanese-occupied Manchuria was at UT+9, i.e., Japan time.
 #   * The five-zone plan was resurrected after WWII and officially put into
 #     place (with some modifications) in March 1948.  It's not clear
 #     how well it was observed in areas under Nationalist control.
 #   * The People's Liberation Army used UT+8 during the civil war.
 #
 # An AP article "Shanghai Internat'l Area Little Changed" in the
 # Lewiston (ME) Daily Sun (1939-05-29), p 17, said "Even the time is
 # different - the occupied districts going by Tokyo time, an hour
 # ahead of that prevailing in the rest of Shanghai."  Guess that the
 # Xujiahui Observatory was under French control and stuck with UT +08.
 #
 # In earlier versions of this file, China had many separate Zone entries, but
 # this was based on what were apparently incorrect data in Shanks & Pottenger.
 # This has now been simplified to the two entries Asia/Shanghai and
 # Asia/Urumqi, with the others being links for backward compatibility.
 # Proposed in 1918 and theoretically in effect until 1949 (although in practice
 # mainly observed in coastal areas), the five zones were:
 #
 # Changbai Time ("Long-white Time", Long-white = Heilongjiang area) UT +08:30
 # Now part of Asia/Shanghai; its pre-1970 times are not recorded here.
 # Heilongjiang (except Mohe county), Jilin
 #
 # Zhongyuan Time ("Central plain Time") UT +08
 # Now part of Asia/Shanghai.
 # most of China
 # Milne gives 8:05:43.2 for Xujiahui Observatory time....
 # Guo says Shanghai switched to UT +08 "from the end of the 19th century".
 #
 # Long-shu Time (probably as Long and Shu were two names of the area) UT +07
 # Now part of Asia/Shanghai; its pre-1970 times are not recorded here.
 # Guangxi, Guizhou, Hainan, Ningxia, Sichuan, Shaanxi, and Yunnan;
 # most of Gansu; west Inner Mongolia; east Qinghai; and the Guangdong
 # counties Deqing, Enping, Kaiping, Luoding, Taishan, Xinxing,
 # Yangchun, Yangjiang, Yu'nan, and Yunfu.
 #
 # Xin-zang Time ("Xinjiang-Tibet Time") UT +06
 # This region is now part of either Asia/Urumqi or Asia/Shanghai with
 # current boundaries uncertain; times before 1970 for areas that
 # disagree with Ürümqi or Shanghai are not recorded here.
 # The Gansu counties Aksay, Anxi, Dunhuang, Subei; west Qinghai;
 # the Guangdong counties  Xuwen, Haikang, Suixi, Lianjiang,
 # Zhanjiang, Wuchuan, Huazhou, Gaozhou, Maoming, Dianbai, and Xinyi;
 # east Tibet, including Lhasa, Chamdo, Shigaise, Jimsar, Shawan and Hutubi;
 # east Xinjiang, including Ürümqi, Turpan, Karamay, Korla, Minfeng, Jinghe,
 # Wusu, Qiemo, Xinyan, Wulanwusu, Jinghe, Yumin, Tacheng, Tuoli, Emin,
 # Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami,
 # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan.
 #
 # Kunlun Time UT +05:30
 # This region is now in the same status as Xin-zang Time (see above).
 # West Tibet, including Pulan, Aheqi, Shufu, Shule;
 # West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke,
 # Zhaosu, Tekesi, Gongliu, Chabuchaer, Huocheng, Bole, Pishan, Suiding,
 # and Yarkand.
 
 # From Luther Ma (2009-10-17):
 # Almost all (>99.9%) ethnic Chinese (properly ethnic Han) living in
 # Xinjiang use Chinese Standard Time. Some are aware of Xinjiang time,
 # but have no need of it. All planes, trains, and schools function on
 # what is called "Beijing time." When Han make an appointment in Chinese
 # they implicitly use Beijing time.
 #
 # On the other hand, ethnic Uyghurs, who make up about half the
 # population of Xinjiang, typically use "Xinjiang time" which is two
 # hours behind Beijing time, or UT +06. The government of the Xinjiang
 # Uyghur Autonomous Region, (XAUR, or just Xinjiang for short) as well as
 # local governments such as the Ürümqi city government use both times in
 # publications, referring to what is popularly called Xinjiang time as
 # "Ürümqi time." When Uyghurs make an appointment in the Uyghur language
 # they almost invariably use Xinjiang time.
 #
 # (Their ethnic Han compatriots would typically have no clue of its
 # widespread use, however, because so extremely few of them are fluent in
 # Uyghur, comparable to the number of Anglo-Americans fluent in Navajo.)
 #
 # (...As with the rest of China there was a brief interval ending in 1990
 # or 1991 when summer time was in use.  The confusion was severe, with
 # the province not having dual times but four times in use at the same
 # time. Some areas remained on standard Xinjiang time or Beijing time and
 # others moving their clocks ahead.)
 
 # From Luther Ma (2009-11-19):
 # With the risk of being redundant to previous answers these are the most common
 # English "transliterations" (w/o using non-English symbols):
 #
 # 1. Wulumuqi...
 # 2. Kashi...
 # 3. Urumqi...
 # 4. Kashgar...
 # ...
 # 5. It seems that Uyghurs in Ürümqi has been using Xinjiang since at least the
 # 1960's. I know of one Han, now over 50, who grew up in the surrounding
 # countryside and used Xinjiang time as a child.
 #
 # 6. Likewise for Kashgar and the rest of south Xinjiang I don't know of any
 # start date for Xinjiang time.
 #
 # Without having access to local historical records, nor the ability to legally
 # publish them, I would go with October 1, 1949, when Xinjiang became the Uyghur
 # Autonomous Region under the PRC. (Before that Uyghurs, of course, would also
 # not be using Beijing time, but some local time.)
 
 # From David Cochrane (2014-03-26):
 # Just a confirmation that Ürümqi time was implemented in Ürümqi on 1 Feb 1986:
 # https://content.time.com/time/magazine/article/0,9171,960684,00.html
 
 # From Luther Ma (2014-04-22):
 # I have interviewed numerous people of various nationalities and from
 # different localities in Xinjiang and can confirm the information in Guo's
 # report regarding Xinjiang, as well as the Time article reference by David
 # Cochrane.  Whether officially recognized or not (and both are officially
 # recognized), two separate times have been in use in Xinjiang since at least
 # the Cultural Revolution: Xinjiang Time (XJT), aka Ürümqi Time or local time;
 # and Beijing Time.  There is no confusion in Xinjiang as to which name refers
 # to which time. Both are widely used in the province, although in some
 # population groups might be use one to the exclusion of the other.  The only
 # problem is that computers and smart phones list Ürümqi (or Kashgar) as
 # having the same time as Beijing.
 
 # From Paul Eggert (2014-06-30):
 # In the early days of the PRC, Tibet was given its own time zone (UT +06)
 # but this was withdrawn in 1959 and never reinstated; see Tubten Khétsun,
 # Memories of life in Lhasa under Chinese Rule, Columbia U Press, ISBN
 # 978-0231142861 (2008), translator's introduction by Matthew Akester, p x.
 # As this is before our 1970 cutoff, Tibet doesn't need a separate zone.
 #
 # Xinjiang Time is well-documented as being officially recognized.  E.g., see
 # "The Working-Calendar for The Xinjiang Uygur Autonomous Region Government"
 #  (2014-04-22).
 # Unfortunately, we have no good records of time in Xinjiang before 1986.
 # During the 20th century parts of Xinjiang were ruled by the Qing dynasty,
 # the Republic of China, various warlords, the First and Second East Turkestan
 # Republics, the Soviet Union, the Kuomintang, and the People's Republic of
 # China, and tracking down all these organizations' timekeeping rules would be
 # quite a trick.  Approximate this lost history by a transition from LMT to
 # UT +06 at the start of 1928, the year of accession of the warlord Jin Shuren,
 # which happens to be the date given by Shanks & Pottenger (no doubt as a
 # guess) as the transition from LMT.  Ignore the usage of +08 before
 # 1986-02-01 under the theory that the transition date to +08 is unknown and
 # that the sort of users who prefer Asia/Urumqi now typically ignored the
 # +08 mandate back then.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # Beijing time, used throughout China; represented by Shanghai.
 		#STDOFF	8:05:43.2
 Zone	Asia/Shanghai	8:05:43	-	LMT	1901
 			8:00	Shang	C%sT	1949 May 28
 			8:00	PRC	C%sT
 # Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi
 # / Wulumuqi.  (Please use Asia/Shanghai if you prefer Beijing time.)
 # Vostok base in Antarctica matches this since 1970.
 Zone	Asia/Urumqi	5:50:20	-	LMT	1928
 			6:00	-	+06
 
 # Hong Kong
 
 # Milne gives 7:36:41.7.
 
 # From Lee Yiu Chung (2009-10-24):
 # I found there are some mistakes for the...DST rule for Hong
 # Kong. [According] to the DST record from Hong Kong Observatory (actually,
 # it is not [an] observatory, but the official meteorological agency of HK,
 # and also serves as the official timing agency), there are some missing
 # and incorrect rules. Although the exact switch over time is missing, I
 # think 3:30 is correct.
 
 # From Phake Nick (2018-10-27):
 # According to Singaporean newspaper
 # http://eresources.nlb.gov.sg/newspapers/Digitised/Article/singfreepresswk19041102-1.2.37
 # the day that Hong Kong start using GMT+8 should be Oct 30, 1904.
 #
 # From Paul Eggert (2018-11-17):
 # Hong Kong had a time ball near the Marine Police Station, Tsim Sha Tsui.
 # "The ball was raised manually each day and dropped at exactly 1pm
 # (except on Sundays and Government holidays)."
 # Dyson AD. From Time Ball to Atomic Clock. Hong Kong Government. 1983.
 # 
 # "From 1904 October 30 the time-ball at Hong Kong has been dropped by order
 # of the Governor of the Colony at 17h 0m 0s G.M.T., which is 23m 18s.14 in
 # advance of 1h 0m 0s of Hong Kong mean time."
 # Hollis HP. Universal Time, Longitudes, and Geodesy. Mon Not R Astron Soc.
 # 1905-02-10;65(4):405-6. https://doi.org/10.1093/mnras/65.4.382
 #
 # From Joseph Myers (2018-11-18):
 # An astronomer before 1925 referring to GMT would have been using the old
 # astronomical convention where the day started at noon, not midnight.
 #
 # From Steve Allen (2018-11-17):
 # Meteorological Observations made at the Hongkong Observatory in the year 1904
 # page 4 
 # ... the log of drop times in Table II shows that on Sunday 1904-10-30 the
 # ball was dropped.  So that looks like a special case drop for the sake
 # of broadcasting the new local time.
 #
 # From Phake Nick (2018-11-18):
 # According to The Hong Kong Weekly Press, 1904-10-29, p.324, the
 # governor of Hong Kong at the time stated that "We are further desired to
 # make it known that the change will be effected by firing the gun and by the
 # dropping of the Ball at 23min. 18sec. before one."
 # From Paul Eggert (2018-11-18):
 # See  for this; unfortunately Flash is required.
 
 # From Phake Nick (2018-10-26):
 # I went to check microfilm records stored at Hong Kong Public Library....
 # on September 30 1941, according to Ta Kung Pao (Hong Kong edition), it was
 # stated that fallback would occur on the next day (the 1st)'s "03:00 am (Hong
 # Kong Time 04:00 am)" and the clock will fall back for a half hour. (03:00
 # probably refer to the time commonly used in mainland China at the time given
 # the paper's background) ... the sunrise/sunset time given by South China
 # Morning Post for October 1st was indeed moved by half an hour compares to
 # before.  After that, in December, the battle to capture Hong Kong started and
 # the library doesn't seems to have any record stored about press during that
 # period of time.  Some media resumed publication soon after that within the
 # same month, but there were not much information about time there.  Later they
 # started including a radio program guide when they restored radio service,
 # explicitly mentioning it use Tokyo standard time, and later added a note
 # saying it's half an hour ahead of the old Hong Kong standard time, and it
 # also seems to indicate that Hong Kong was not using GMT+8 when it was
 # captured by Japan.
 #
 # Image of related sections on newspaper:
 # * 1941-09-30, Ta Kung Pao (Hong Kong), "Winter Time start tomorrow".
 #   https://i.imgur.com/6waY51Z.jpg (Chinese)
 # * 1941-09-29, South China Morning Post, Information on sunrise/sunset
 #   time and other things for September 30 and October 1.
 #   https://i.imgur.com/kCiUR78.jpg
 # * 1942-02-05. The Hong Kong News, Radio Program Guide.
 #   https://i.imgur.com/eVvDMzS.jpg
 # * 1941-06-14. Hong Kong Daily Press, Daylight Saving from 3am Tomorrow.
 #   https://i.imgur.com/05KkvtC.png
 # * 1941-09-30, Hong Kong Daily Press, Winter Time Warning.
 #   https://i.imgur.com/dge4kFJ.png
 
 # From Paul Eggert (2019-07-11):
 # "Hong Kong winter time" is considered to be daylight saving.
 # "Hong Kong had adopted daylight saving on June 15 as a wartime measure,
 # clocks moving forward one hour until October 1, when they would be put back
 # by just half an hour for 'Hong Kong Winter time', so that daylight saving
 # operated year round." -- Low Z. The longest day: when wartime Hong Kong
 # introduced daylight saving. South China Morning Post. 2019-06-28.
 # https://www.scmp.com/magazines/post-magazine/short-reads/article/3016281/longest-day-when-wartime-hong-kong-introduced
 
 # From P Chan (2018-12-31):
 # * According to the Hong Kong Daylight-Saving Regulations, 1941, the
 #   1941 spring-forward transition was at 03:00.
 #	http://sunzi.lib.hku.hk/hkgro/view/g1941/304271.pdf
 #	http://sunzi.lib.hku.hk/hkgro/view/g1941/305516.pdf
 # * According to some articles from South China Morning Post, +08 was
 #   resumed on 1945-11-18 at 02:00.
 #	https://i.imgur.com/M2IsZ3c.png
 #	https://i.imgur.com/iOPqrVo.png
 #	https://i.imgur.com/fffcGDs.png
 # * Some newspapers ... said the 1946 spring-forward transition was on
 #   04-21 at 00:00.  The Kung Sheung Evening News 1946-04-20 (Chinese)
 #	https://i.imgur.com/ZSzent0.png
 #	https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2FH7zGe%2FKF%2BFLYsuqGhRBfe p.4
 #   The Kung Sheung Daily News 1946-04-21 (Chinese)
 #	https://i.imgur.com/7ecmRlcm.png
 #	https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2BQBGt1%2BwUj5qG2GqtwR3Wh p.4
 # * According to the Summer Time Ordinance (1946), the fallback
 #   transitions between 1946 and 1952 were at 03:30 Standard Time (+08)
 #	http://oelawhk.lib.hku.hk/archive/files/bb74b06a74d5294620a15de560ab33c6.pdf
 # * Some other laws and regulations related to DST from 1953 to 1979
 #   Summer Time Ordinance 1953
 #	https://i.imgur.com/IOlJMav.jpg
 #   Summer Time (Amendment) Ordinance 1965
 #	https://i.imgur.com/8rofeLa.jpg
 #   Interpretation and General Clauses Ordinance (1966)
 #	https://i.imgur.com/joy3msj.jpg
 #   Emergency (Summer Time) Regulation 1973 
 #   Interpretation and General Clauses (Amendment) Ordinance 1977
 #	https://i.imgur.com/RaNqnc4.jpg
 #   Resolution of the Legislative Council passed on 9 May 1979
 #	https://www.legco.gov.hk/yr78-79/english/lc_sitg/hansard/h790509.pdf#page=39
 
 # From Paul Eggert (2020-04-15):
 # Here are the dates given at
 # https://www.hko.gov.hk/en/gts/time/Summertime.htm
 # as of 2020-02-10:
 # Year        Period
 # 1941        15 Jun to 30 Sep
 # 1942        Whole year
 # 1943        Whole year
 # 1944        Whole year
 # 1945        Whole year
 # 1946        20 Apr to 1 Dec
 # 1947        13 Apr to 30 Nov
 # 1948        2 May to 31 Oct
 # 1949        3 Apr to 30 Oct
 # 1950        2 Apr to 29 Oct
 # 1951        1 Apr to 28 Oct
 # 1952        6 Apr to 2 Nov
 # 1953        5 Apr to 1 Nov
 # 1954        21 Mar to 31 Oct
 # 1955        20 Mar to 6 Nov
 # 1956        18 Mar to 4 Nov
 # 1957        24 Mar to 3 Nov
 # 1958        23 Mar to 2 Nov
 # 1959        22 Mar to 1 Nov
 # 1960        20 Mar to 6 Nov
 # 1961        19 Mar to 5 Nov
 # 1962        18 Mar to 4 Nov
 # 1963        24 Mar to 3 Nov
 # 1964        22 Mar to 1 Nov
 # 1965        18 Apr to 17 Oct
 # 1966        17 Apr to 16 Oct
 # 1967        16 Apr to 22 Oct
 # 1968        21 Apr to 20 Oct
 # 1969        20 Apr to 19 Oct
 # 1970        19 Apr to 18 Oct
 # 1971        18 Apr to 17 Oct
 # 1972        16 Apr to 22 Oct
 # 1973        22 Apr to 21 Oct
 # 1973/74     30 Dec 73 to 20 Oct 74
 # 1975        20 Apr to 19 Oct
 # 1976        18 Apr to 17 Oct
 # 1977        Nil
 # 1978        Nil
 # 1979        13 May to 21 Oct
 # 1980 to Now Nil
 # The page does not give times of day for transitions,
 # or dates for the 1942 and 1945 transitions.
 # The Japanese occupation of Hong Kong began 1941-12-25.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	HK	1946	only	-	Apr	21	0:00	1:00	S
 Rule	HK	1946	only	-	Dec	1	3:30s	0	-
 Rule	HK	1947	only	-	Apr	13	3:30s	1:00	S
 Rule	HK	1947	only	-	Nov	30	3:30s	0	-
 Rule	HK	1948	only	-	May	2	3:30s	1:00	S
 Rule	HK	1948	1952	-	Oct	Sun>=28	3:30s	0	-
 Rule	HK	1949	1953	-	Apr	Sun>=1	3:30	1:00	S
 Rule	HK	1953	1964	-	Oct	Sun>=31	3:30	0	-
 Rule	HK	1954	1964	-	Mar	Sun>=18	3:30	1:00	S
 Rule	HK	1965	1976	-	Apr	Sun>=16	3:30	1:00	S
 Rule	HK	1965	1976	-	Oct	Sun>=16	3:30	0	-
 Rule	HK	1973	only	-	Dec	30	3:30	1:00	S
 Rule	HK	1979	only	-	May	13	3:30	1:00	S
 Rule	HK	1979	only	-	Oct	21	3:30	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	7:36:41.7
 Zone	Asia/Hong_Kong	7:36:42 -	LMT	1904 Oct 29 17:00u
 			8:00	-	HKT	1941 Jun 15  3:00
 			8:00	1:00	HKST	1941 Oct  1  4:00
 			8:00	0:30	HKWT	1941 Dec 25
 			9:00	-	JST	1945 Nov 18  2:00
 			8:00	HK	HK%sT
 
 ###############################################################################
 
 # Taiwan
 
 # From smallufo (2010-04-03):
 # According to Taiwan's CWB [Central Weather Bureau],
 # http://www.cwb.gov.tw/V6/astronomy/cdata/summert.htm
 # Taipei has DST in 1979 between July 1st and Sep 30.
 
 # From Yu-Cheng Chuang (2013-07-12):
 # On Dec 28, 1895, the Meiji Emperor announced Ordinance No. 167 of
 # Meiji Year 28 "The clause about standard time", mentioned that
 # Taiwan and Penghu Islands, as well as Yaeyama and Miyako Islands
 # (both in Okinawa) adopt the Western Standard Time which is based on
 # 120E. The adoption began from Jan 1, 1896. The original text can be
 # found on Wikisource:
 # https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
 # ... This could be the first adoption of time zone in Taiwan, because
 # during the Qing Dynasty, it seems that there was no time zone
 # declared officially.
 #
 # Later, in the beginning of World War II, on Sep 25, 1937, the Showa
 # Emperor announced Ordinance No. 529 of Showa Year 12 "The clause of
 # revision in the ordinance No. 167 of Meiji year 28 about standard
 # time", in which abolished the adoption of Western Standard Time in
 # western islands (listed above), which means the whole Japan
 # territory, including later occupations, adopt Japan Central Time
 # (UT+9). The adoption began on Oct 1, 1937. The original text can
 # be found on Wikisource:
 # https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
 #
 # That is, the time zone of Taipei switched to UT+9 on Oct 1, 1937.
 
 # From Yu-Cheng Chuang (2014-07-02):
 # I've found more evidence about when the time zone was switched from UT+9
 # back to UT+8 after WW2.  I believe it was on Sep 21, 1945.  In a document
 # during Japanese era [1] in which the officer told the staff to change time
 # zone back to Western Standard Time (UT+8) on Sep 21.  And in another
 # history page of National Cheng Kung University [2], on Sep 21 there is a
 # note "from today, switch back to Western Standard Time".  From these two
 # materials, I believe that the time zone change happened on Sep 21.  And
 # today I have found another monthly journal called "The Astronomical Herald"
 # from The Astronomical Society of Japan [3] in which it mentioned the fact
 # that:
 #
 # 1. Standard Time of the Country (Japan) was adopted on Jan 1, 1888, using
 # the time at 135E (GMT+9)
 #
 # 2. Standard Time of the Country was renamed to Central Standard Time, on Jan
 # 1, 1898, and on the same day, the new territories Taiwan and Penghu islands,
 # as well as Yaeyama and Miyako islands, adopted a new time zone called
 # Western Standard Time, which is in GMT+8.
 #
 # 3. Western Standard Time was deprecated on Sep 30, 1937. From then all the
 # territories of Japan adopted the same time zone, which is Central Standard
 # Time.
 #
 # [1] Academica Historica, Taiwan:
 # http://163.29.208.22:8080/govsaleShowImage/connect_img.php?s=00101738900090036&e=00101738900090037
 # [2] Nat'l Cheng Kung University 70th Anniversary Special Site:
 # http://www.ncku.edu.tw/~ncku70/menu/001/01_01.htm
 # [3] Yukio Niimi, The Standard Time in Japan (1997), p.475:
 # http://www.asj.or.jp/geppou/archive_open/1997/pdf/19971001c.pdf
 
 # Yu-Cheng Chuang (2014-07-03):
 # I finally have found the real official gazette about changing back to
 # Western Standard Time on Sep 21 in Taiwan.  It's Taiwan Governor-General
 # Bulletin No. 386 in Showa 20 years (1945), published on Sep 19, 1945. [1] ...
 # [It] abolishes Bulletin No. 207 in Showa 12 years (1937), which is a local
 # bulletin in Taiwan for that Ordinance No. 529. It also mentioned that 1am on
 # Sep 21, 1945 will be 12am on Sep 21.  I think this bulletin is much more
 # official than the one I mentioned in my first mail, because it's from the
 # top-level government in Taiwan. If you're going to quote any resource, this
 # would be a good one.
 # [1] Taiwan Governor-General Gazette, No. 1018, Sep 19, 1945:
 # http://db2.th.gov.tw/db2/view/viewImg.php?imgcode=0072031018a&num=19&bgn=019&end=019&otherImg=&type=gener
 
 # From Yu-Cheng Chuang (2014-07-02):
 # In 1946, DST in Taiwan was from May 15 and ended on Sep 30. The info from
 # Central Weather Bureau website was not correct.
 #
 # Original Bulletin:
 # http://subtpg.tpg.gov.tw/og/image2.asp?f=03502F0AKM1AF
 # http://subtpg.tpg.gov.tw/og/image2.asp?f=0350300AKM1B0 (cont.)
 #
 # In 1947, DST in Taiwan was expanded to Oct 31. There is a backup of that
 # telegram announcement from Taiwan Province Government:
 #
 # http://subtpg.tpg.gov.tw/og/image2.asp?f=0360310AKZ431
 #
 # Here is a brief translation:
 #
 #   The Summer Time this year is adopted from midnight Apr 15 until Sep 20
 #   midnight. To save (energy?) consumption, we're expanding Summer Time
 #   adoption till Oct 31 midnight.
 #
 # The Central Weather Bureau website didn't mention that, however it can
 # be found from historical government announcement database.
 
 # From Paul Eggert (2014-07-03):
 # As per Yu-Cheng Chuang, say that Taiwan was at UT +09 from 1937-10-01
 # until 1945-09-21 at 01:00, overriding Shanks & Pottenger.
 # Likewise, use Yu-Cheng Chuang's data for DST in Taiwan.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Taiwan	1946	only	-	May	15	0:00	1:00	D
 Rule	Taiwan	1946	only	-	Oct	1	0:00	0	S
 Rule	Taiwan	1947	only	-	Apr	15	0:00	1:00	D
 Rule	Taiwan	1947	only	-	Nov	1	0:00	0	S
 Rule	Taiwan	1948	1951	-	May	1	0:00	1:00	D
 Rule	Taiwan	1948	1951	-	Oct	1	0:00	0	S
 Rule	Taiwan	1952	only	-	Mar	1	0:00	1:00	D
 Rule	Taiwan	1952	1954	-	Nov	1	0:00	0	S
 Rule	Taiwan	1953	1959	-	Apr	1	0:00	1:00	D
 Rule	Taiwan	1955	1961	-	Oct	1	0:00	0	S
 Rule	Taiwan	1960	1961	-	Jun	1	0:00	1:00	D
 Rule	Taiwan	1974	1975	-	Apr	1	0:00	1:00	D
 Rule	Taiwan	1974	1975	-	Oct	1	0:00	0	S
 Rule	Taiwan	1979	only	-	Jul	1	0:00	1:00	D
 Rule	Taiwan	1979	only	-	Oct	1	0:00	0	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # Taipei or Taibei or T'ai-pei
 Zone	Asia/Taipei	8:06:00 -	LMT	1896 Jan  1
 			8:00	-	CST	1937 Oct  1
 			9:00	-	JST	1945 Sep 21  1:00
 			8:00	Taiwan	C%sT
 
 # Macau (Macao, Aomen)
 #
 # From P Chan (2018-05-10):
 # * LegisMac
 #   http://legismac.safp.gov.mo/legismac/descqry/Descqry.jsf?lang=pt
 #   A database for searching titles of legal documents of Macau in
 #   Chinese and Portuguese.  The term "HORÁRIO DE VERÃO" can be used for
 #   searching decrees about summer time.
 # * Archives of Macao
 #   http://www.archives.gov.mo/en/bo/
 #   It contains images of old official gazettes.
 # * The Macao Meteorological and Geophysical Bureau have a page listing the
 #   summer time history.  But it is not complete and has some mistakes.
 #   http://www.smg.gov.mo/smg/geophysics/e_t_Summer%20Time.htm
 # Macau adopted GMT+8 on 30 Oct 1904 to follow Hong Kong.  Clocks were
 # advanced by 25 minutes and 50 seconds.  Which means the LMT used was
 # +7:34:10.  As stated in the "Portaria No. 204" dated 21 October 1904
 # and published in the Official Gazette on 29 October 1904.
 # http://igallery.icm.gov.mo/Images/Archives/BO/MO_AH_PUB_BO_1904_10/MO_AH_PUB_BO_1904_10_00025_Grey.JPG
 #
 # Therefore the 1911 decree of Portugal did not change time in Macau.
 #
 # From LegisMac, here is a list of decrees that changed the time ...
 # [Decree Gazette-no. date; titles omitted in this quotation]
 #	DIL 732 BOCM 51 1941.12.20
 #	DIL 764 BOCM 9S 1942.04.30
 #	DIL 781 BOCM 21 1942.10.10
 #	PT 3434 BOCM 8S 1943.04.17
 #	PT 3504 BOCM 20 1943.09.25
 #	PT 3843 BOCM 39 1945.09.29
 #	PT 3961 BOCM 17 1946.04.27
 #	PT 4026 BOCM 39 1946.09.28
 #	PT 4153 BOCM 16 1947.04.10
 #	PT 4271 BOCM 48 1947.11.29
 #	PT 4374 BOCM 18 1948.05.01
 #	PT 4465 BOCM 44 1948.10.30
 #	PT 4590 BOCM 14 1949.04.02
 #	PT 4666 BOCM 44 1949.10.29
 #	PT 4771 BOCM 12 1950.03.25
 #	PT 4838 BOCM 43 1950.10.28
 #	PT 4946 BOCM 12 1951.03.24
 #	PT 5025 BO 43 1951.10.27
 #	PT 5149 BO 14 1952.04.05
 #	PT 5251 BO 43 1952.10.25
 #	PT 5366 BO 13 1953.03.28
 #	PT 5444 BO 44 1953.10.31
 #	PT 5540 BO 12 1954.03.20
 #	PT 5589 BO 44 1954.10.30
 #	PT 5676 BO 12 1955.03.19
 #	PT 5739 BO 45 1955.11.05
 #	PT 5823 BO 11 1956.03.17
 #	PT 5891 BO 44 1956.11.03
 #	PT 5981 BO 12 1957.03.23
 #	PT 6064 BO 43 1957.10.26
 #	PT 6172 BO 12 1958.03.22
 #	PT 6243 BO 43 1958.10.25
 #	PT 6341 BO 12 1959.03.21
 #	PT 6411 BO 43 1959.10.24
 #	PT 6514 BO 11 1960.03.12
 #	PT 6584 BO 44 1960.10.29
 #	PT 6721 BO 10 1961.03.11
 #	PT 6815 BO 43 1961.10.28
 #	PT 6947 BO 10 1962.03.10
 #	PT 7080 BO 43 1962.10.27
 #	PT 7218 BO 12 1963.03.23
 #	PT 7340 BO 43 1963.10.26
 #	PT 7491 BO 11 1964.03.14
 #	PT 7664 BO 43 1964.10.24
 #	PT 7846 BO 15 1965.04.10
 #	PT 7979 BO 42 1965.10.16
 #	PT 8146 BO 15 1966.04.09
 #	PT 8252 BO 41 1966.10.08
 #	PT 8429 BO 15 1967.04.15
 #	PT 8540 BO 41 1967.10.14
 #	PT 8735 BO 15 1968.04.13
 #	PT 8860 BO 41 1968.10.12
 #	PT 9035 BO 16 1969.04.19
 #	PT 9156 BO 42 1969.10.18
 #	PT 9328 BO 15 1970.04.11
 #	PT 9418 BO 41 1970.10.10
 #	PT 9587 BO 14 1971.04.03
 #	PT 9702 BO 41 1971.10.09
 #	PT 38-A/72 BO 14 1972.04.01
 #	PT 126-A/72 BO 41 1972.10.07
 #	PT 61/73 BO 14 1973.04.07
 #	PT 182/73 BO 40 1973.10.06
 #	PT 282/73 BO 51 1973.12.22
 #	PT 177/74 BO 41 1974.10.12
 #	PT 51/75 BO 15 1975.04.12
 #	PT 173/75 BO 41 1975.10.11
 #	PT 67/76/M BO 14 1976.04.03
 #	PT 169/76/M BO 41 1976.10.09
 #	PT 78/79/M BO 19 1979.05.12
 #	PT 166/79/M BO 42 1979.10.20
 # Note that DIL 732 does not belong to "HORÁRIO DE VERÃO" according to
 # LegisMac.... Note that between 1942 and 1945, the time switched
 # between GMT+9 and GMT+10.  Also in 1965 and 1965 the DST ended at 2:30am.
 
 # From Paul Eggert (2018-05-10):
 # The 1904 decree says that Macau changed from the meridian of
 # Fortaleza do Monte, presumably the basis for the 7:34:10 for LMT.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Macau	1942	1943	-	Apr	30	23:00	1:00	-
 Rule	Macau	1942	only	-	Nov	17	23:00	0	-
 Rule	Macau	1943	only	-	Sep	30	23:00	0	S
 Rule	Macau	1946	only	-	Apr	30	23:00s	1:00	D
 Rule	Macau	1946	only	-	Sep	30	23:00s	0	S
 Rule	Macau	1947	only	-	Apr	19	23:00s	1:00	D
 Rule	Macau	1947	only	-	Nov	30	23:00s	0	S
 Rule	Macau	1948	only	-	May	 2	23:00s	1:00	D
 Rule	Macau	1948	only	-	Oct	31	23:00s	0	S
 Rule	Macau	1949	1950	-	Apr	Sat>=1	23:00s	1:00	D
 Rule	Macau	1949	1950	-	Oct	lastSat	23:00s	0	S
 Rule	Macau	1951	only	-	Mar	31	23:00s	1:00	D
 Rule	Macau	1951	only	-	Oct	28	23:00s	0	S
 Rule	Macau	1952	1953	-	Apr	Sat>=1	23:00s	1:00	D
 Rule	Macau	1952	only	-	Nov	 1	23:00s	0	S
 Rule	Macau	1953	1954	-	Oct	lastSat	23:00s	0	S
 Rule	Macau	1954	1956	-	Mar	Sat>=17	23:00s	1:00	D
 Rule	Macau	1955	only	-	Nov	 5	23:00s	0	S
 Rule	Macau	1956	1964	-	Nov	Sun>=1	03:30	0	S
 Rule	Macau	1957	1964	-	Mar	Sun>=18	03:30	1:00	D
 Rule	Macau	1965	1973	-	Apr	Sun>=16	03:30	1:00	D
 Rule	Macau	1965	1966	-	Oct	Sun>=16	02:30	0	S
 Rule	Macau	1967	1976	-	Oct	Sun>=16	03:30	0	S
 Rule	Macau	1973	only	-	Dec	30	03:30	1:00	D
 Rule	Macau	1975	1976	-	Apr	Sun>=16	03:30	1:00	D
 Rule	Macau	1979	only	-	May	13	03:30	1:00	D
 Rule	Macau	1979	only	-	Oct	Sun>=16	03:30	0	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Macau	7:34:10 -	LMT	1904 Oct 30
 			8:00	-	CST	1941 Dec 21 23:00
 			9:00	Macau	+09/+10	1945 Sep 30 24:00
 			8:00	Macau	C%sT
 
 
 ###############################################################################
 
 # Cyprus
 
 # Milne says the Eastern Telegraph Company used 2:14:00.  Stick with LMT.
 # IATA SSIM (1998-09) has Cyprus using EU rules for the first time.
 
 # From Paul Eggert (2016-09-09):
 # Yesterday's Cyprus Mail reports that Northern Cyprus followed Turkey's
 # lead and switched from +02/+03 to +03 year-round.
 # http://cyprus-mail.com/2016/09/08/two-time-zones-cyprus-turkey-will-not-turn-clocks-back-next-month/
 #
 # From Even Scharning (2016-10-31):
 # Looks like the time zone split in Cyprus went through last night.
 # http://cyprus-mail.com/2016/10/30/cyprus-new-division-two-time-zones-now-reality/
 
 # From Paul Eggert (2017-10-18):
 # Northern Cyprus will reinstate winter time on October 29, thus
 # staying in sync with the rest of Cyprus.  See: Anastasiou A.
 # Cyprus to remain united in time.  Cyprus Mail 2017-10-17.
 # https://cyprus-mail.com/2017/10/17/cyprus-remain-united-time/
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Cyprus	1975	only	-	Apr	13	0:00	1:00	S
 Rule	Cyprus	1975	only	-	Oct	12	0:00	0	-
 Rule	Cyprus	1976	only	-	May	15	0:00	1:00	S
 Rule	Cyprus	1976	only	-	Oct	11	0:00	0	-
 Rule	Cyprus	1977	1980	-	Apr	Sun>=1	0:00	1:00	S
 Rule	Cyprus	1977	only	-	Sep	25	0:00	0	-
 Rule	Cyprus	1978	only	-	Oct	2	0:00	0	-
 Rule	Cyprus	1979	1997	-	Sep	lastSun	0:00	0	-
 Rule	Cyprus	1981	1998	-	Mar	lastSun	0:00	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Nicosia	2:13:28 -	LMT	1921 Nov 14
 			2:00	Cyprus	EE%sT	1998 Sep
 			2:00	EUAsia	EE%sT
 Zone	Asia/Famagusta	2:15:48	-	LMT	1921 Nov 14
 			2:00	Cyprus	EE%sT	1998 Sep
 			2:00	EUAsia	EE%sT	2016 Sep  8
 			3:00	-	+03	2017 Oct 29 1:00u
 			2:00	EUAsia	EE%sT
 
 # Georgia
 # From Paul Eggert (1994-11-19):
 # Today's _Economist_ (p 60) reports that Georgia moved its clocks forward
 # an hour recently, due to a law proposed by Zurab Murvanidze,
 # an MP who went on a hunger strike for 11 days to force discussion about it!
 # We have no details, but we'll guess they didn't move the clocks back in fall.
 #
 # From Mathew Englander, quoting AP (1996-10-23 13:05-04):
 # Instead of putting back clocks at the end of October, Georgia
 # will stay on daylight savings time this winter to save energy,
 # President Eduard Shevardnadze decreed Wednesday.
 #
 # From the BBC via Joseph S. Myers (2004-06-27):
 #
 # Georgia moved closer to Western Europe on Sunday...  The former Soviet
 # republic has changed its time zone back to that of Moscow.  As a result it
 # is now just four hours ahead of Greenwich Mean Time, rather than five hours
 # ahead.  The switch was decreed by the pro-Western president of Georgia,
 # Mikheil Saakashvili, who said the change was partly prompted by the process
 # of integration into Europe.
 
 # From Teimuraz Abashidze (2005-11-07):
 # Government of Georgia ... decided to NOT CHANGE daylight savings time on
 # [Oct.] 30, as it was done before during last more than 10 years.
 # Currently, we are in fact GMT +4:00, as before 30 October it was GMT
 # +3:00.... The problem is, there is NO FORMAL LAW or governmental document
 # about it.  As far as I can find, I was told, that there is no document,
 # because we just DIDN'T ISSUE document about switching to winter time....
 # I don't know what can be done, especially knowing that some years ago our
 # DST rules where changed THREE TIMES during one month.
 
 # Milne 1899 says Tbilisi (Tiflis) time was 2:59:05.7.
 # Byalokoz 1919 says Georgia was 2:59:11.
 # Go with Byalokoz.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Tbilisi	2:59:11 -	LMT	1880
 			2:59:11	-	TBMT	1924 May  2 # Tbilisi Mean Time
 			3:00	-	+03	1957 Mar
 			4:00 RussiaAsia +04/+05	1991 Mar 31  2:00s
 			3:00 RussiaAsia +03/+04	1992
 			3:00 E-EurAsia	+03/+04	1994 Sep lastSun
 			4:00 E-EurAsia	+04/+05	1996 Oct lastSun
 			4:00	1:00	+05	1997 Mar lastSun
 			4:00 E-EurAsia	+04/+05	2004 Jun 27
 			3:00 RussiaAsia	+03/+04	2005 Mar lastSun  2:00
 			4:00	-	+04
 
 # East Timor
 
 # See Indonesia for the 1945 transition.
 
 # From João Carrascalão, brother of the former governor of East Timor, in
 # East Timor may be late for its millennium
 #  (1999-12-26/31):
 # Portugal tried to change the time forward in 1974 because the sun
 # rises too early but the suggestion raised a lot of problems with the
 # Timorese and I still don't think it would work today because it
 # conflicts with their way of life.
 
 # From Paul Eggert (2000-12-04):
 # We don't have any record of the above attempt.
 # Most likely our records are incomplete, but we have no better data.
 
 # From Manoel de Almeida e Silva, Deputy Spokesman for the UN Secretary-General
 # http://www.hri.org/news/world/undh/2000/00-08-16.undh.html
 # (2000-08-16):
 # The Cabinet of the East Timor Transition Administration decided
 # today to advance East Timor's time by one hour.  The time change,
 # which will be permanent, with no seasonal adjustment, will happen at
 # midnight on Saturday, September 16.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Dili	8:22:20 -	LMT	1912 Jan  1
 			8:00	-	+08	1942 Feb 21 23:00
 			9:00	-	+09	1976 May  3
 			8:00	-	+08	2000 Sep 17  0:00
 			9:00	-	+09
 
 # India
 
 # British astronomer Henry Park Hollis disliked India Standard Time's offset:
 # "A new time system has been proposed for India, Further India, and Burmah.
 # The scheme suggested is that the times of the meridians 5½ and 6½ hours
 # east of Greenwich should be adopted in these territories.  No reason is
 # given why hourly meridians five hours and six hours east should not be
 # chosen; a plan which would bring the time of India into harmony with
 # that of almost the whole of the civilised world."
 # Hollis HP. Universal Time, Longitudes, and Geodesy. Mon Not R Astron Soc.
 # 1905-02-10;65(4):405-6. https://doi.org/10.1093/mnras/65.4.382
 
 # From Ian P. Beacock, in "A brief history of (modern) time", The Atlantic
 # https://www.theatlantic.com/technology/archive/2015/12/the-creation-of-modern-time/421419/
 # (2015-12-22):
 # In January 1906, several thousand cotton-mill workers rioted on the
 # outskirts of Bombay....  They were protesting the proposed abolition of
 # local time in favor of Indian Standard Time....  Journalists called this
 # dispute the "Battle of the Clocks."  It lasted nearly half a century.
 
 # From Paul Eggert (2017-04-20):
 # Good luck trying to nail down old timekeeping records in India.
 # "... in the nineteenth century ... Madras Observatory took its magnetic
 # measurements on Göttingen time, its meteorological measurements on Madras
 # (local) time, dropped its time ball on Greenwich (ocean navigator's) time,
 # and distributed civil (local time)." -- Bartky IR. Selling the true time:
 # 19th-century timekeeping in america. Stanford U Press (2000), 247 note 19.
 # "A more potent cause of resistance to the general adoption of the present
 # standard time lies in the fact that it is Madras time.  The citizen of
 # Bombay, proud of being 'primus in Indis' and of Calcutta, equally proud of
 # his city being the Capital of India, and - for a part of the year - the Seat
 # of the Supreme Government, alike look down on Madras, and refuse to change
 # the time they are using, for that of what they regard as a benighted
 # Presidency; while Madras, having for long given the standard time to the
 # rest of India, would resist the adoption of any other Indian standard in its
 # place." -- Oldham RD. On Time in India: a suggestion for its improvement.
 # Proceedings of the Asiatic Society of Bengal (April 1899), 49-55.
 #
 # "In 1870 ... Madras time - 'now used by the telegraph and regulated from the
 # only government observatory' - was suggested as a standard railway time,
 # first to be adopted on the Great Indian Peninsular Railway (GIPR)....
 # Calcutta, Bombay, and Karachi, were to be allowed to continue with their
 # local time for civil purposes." - Prasad R. Tracks of Change: Railways and
 # Everyday Life in Colonial India. Cambridge University Press (2016), 145.
 #
 # Reed S, Low F. The Indian Year Book 1936-37. Bennett, Coleman, pp 27-8.
 # https://archive.org/details/in.ernet.dli.2015.282212
 # This lists +052110 as Madras local time used in railways, and says that on
 # 1906-01-01 railways and telegraphs in India switched to +0530.  Some
 # municipalities retained their former time, and the time in Calcutta
 # continued to depend on whether you were at the railway station or at
 # government offices.  Government time was at +055320 (according to Shanks) or
 # at +0554 (according to the Indian Year Book).  Railway time is more
 # appropriate for our purposes, as it was better documented, it is what we do
 # elsewhere (e.g., Europe/London before 1880), and after 1906 it was
 # consistent in the region now identified by Asia/Kolkata.  So, use railway
 # time for 1870-1941.  Shanks is our only (and dubious) source for the
 # 1941-1945 data.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Kolkata	5:53:28 -	LMT	1854 Jun 28 # Kolkata
 			5:53:20	-	HMT	1870	    # Howrah Mean Time?
 			5:21:10	-	MMT	1906 Jan  1 # Madras local time
 			5:30	-	IST	1941 Oct
 			5:30	1:00	+0630	1942 May 15
 			5:30	-	IST	1942 Sep
 			5:30	1:00	+0630	1945 Oct 15
 			5:30	-	IST
 # Since 1970 the following are like Asia/Kolkata:
 #	Andaman Is
 #	Lakshadweep (Laccadive, Minicoy and Amindivi Is)
 #	Nicobar Is
 
 # Indonesia
 #
 # From Paul Eggert (2014-09-06):
 # The 1876 Report of the Secretary of the [US] Navy, p 306 says that Batavia
 # civil time was 7:07:12.5.
 #
 # From Gwillim Law (2001-05-28), overriding Shanks & Pottenger:
 # http://www.sumatera-inc.com/go_to_invest/about_indonesia.asp#standtime
 # says that Indonesia's time zones changed on 1988-01-01.  Looking at some
 # time zone maps, I think that must refer to Western Borneo (Kalimantan Barat
 # and Kalimantan Tengah) switching from UTC+8 to UTC+7.
 #
 # From Paul Eggert (2007-03-10):
 # Here is another correction to Shanks & Pottenger.
 # JohnTWB writes that Japanese forces did not surrender control in
 # Indonesia until 1945-09-01 00:00 at the earliest (in Jakarta) and
 # other formal surrender ceremonies were September 9, 11, and 13, plus
 # September 12 for the regional surrender to Mountbatten in Singapore.
 # These would be the earliest possible times for a change.
 # Régimes horaires pour le monde entier, by Henri Le Corre, (Éditions
 # Traditionnelles, 1987, Paris) says that Java and Madura switched
 # from UT +09 to +07:30 on 1945-09-23, and gives 1944-09-01 for Jayapura
 # (Hollandia).  For now, assume all Indonesian locations other than Jayapura
 # switched on 1945-09-23.
 #
 # From Paul Eggert (2013-08-11):
 # Normally the tz database uses English-language abbreviations, but in
 # Indonesia it's typical to use Indonesian-language abbreviations even
 # when writing in English.  For example, see the English-language
 # summary published by the Time and Frequency Laboratory of the
 # Research Center for Calibration, Instrumentation and Metrology,
 # Indonesia,  (2006-09-29).
 # The time zone abbreviations and UT offsets are:
 #
 # WIB  - +07 - Waktu Indonesia Barat (Indonesia western time)
 # WITA - +08 - Waktu Indonesia Tengah (Indonesia central time)
 # WIT  - +09 - Waktu Indonesia Timur (Indonesia eastern time)
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # Java, Sumatra
 		#STDOFF	7:07:12.5
 Zone Asia/Jakarta	7:07:12 -	LMT	1867 Aug 10
 # Shanks & Pottenger say the next transition was at 1924 Jan 1 0:13,
 # but this must be a typo.
 			7:07:12	-	BMT	1923 Dec 31 16:40u # Batavia
 			7:20	-	+0720	1932 Nov
 			7:30	-	+0730	1942 Mar 23
 			9:00	-	+09	1945 Sep 23
 			7:30	-	+0730	1948 May
 			8:00	-	+08	1950 May
 			7:30	-	+0730	1964
 			7:00	-	WIB
 # west and central Borneo
 Zone Asia/Pontianak	7:17:20	-	LMT	1908 May
 			7:17:20	-	PMT	1932 Nov    # Pontianak MT
 			7:30	-	+0730	1942 Jan 29
 			9:00	-	+09	1945 Sep 23
 			7:30	-	+0730	1948 May
 			8:00	-	+08	1950 May
 			7:30	-	+0730	1964
 			8:00	-	WITA	1988 Jan  1
 			7:00	-	WIB
 # Sulawesi, Lesser Sundas, east and south Borneo
 Zone Asia/Makassar	7:57:36 -	LMT	1920
 			7:57:36	-	MMT	1932 Nov    # Macassar MT
 			8:00	-	+08	1942 Feb  9
 			9:00	-	+09	1945 Sep 23
 			8:00	-	WITA
 # Maluku Islands, West Papua, Papua
 Zone Asia/Jayapura	9:22:48 -	LMT	1932 Nov
 			9:00	-	+09	1944 Sep  1
 			9:30	-	+0930	1964
 			9:00	-	WIT
 
 # Iran
 
 # From Roozbeh Pournader (2022-05-30):
 # Here's an order from the Cabinet to the rest of the government to switch to
 # Tehran time, which is mentioned to be already at +03:30:
 # https://qavanin.ir/Law/TreeText/180138
 # Just in case that goes away, I also saved a copy at archive.org:
 # https://web.archive.org/web/20220530111940/https://qavanin.ir/Law/TreeText/180138
 # Here's my translation:
 #
 # "Circular on Matching the Hours of Governmental and Official Circles
 # in Provinces
 # Approved 1314/03/22 [=1935-06-13]
 # According to the ruling of the Honorable Cabinet, it is ordered that from
 # now on in all internal provinces of the country, governmental and official
 # circles set their time to match Tehran time (three hours and half before
 # Greenwich)....
 #
 # I still haven't found out when Tehran itself switched to +03:30....
 #
 # From Paul Eggert (2022-06-05):
 # Although the above says Tehran was at +03:30 before 1935-06-13, we don't
 # know when it switched to +03:30.  For now, use 1935-06-13 as the switch date.
 # Although most likely wrong, we have no better info.
 
 # From Roozbeh Pournader (2022-06-01):
 # This is from Kayhan newspaper, one of the major Iranian newspapers, from
 # March 20, 1978, page 2:
 #
 # "Pull the clocks 60 minutes forward
 # As we informed before, from the fourth day of the month Farvardin of the
 # new year [=1978-03-24], clocks will be pulled forward, and people's daily
 # work and life program will start one hour earlier than the current program.
 # On the 1st day of the month Farvardin of this year [=1977-03-21], they had
 # pulled the clocks forward by one hour, but in the month of Mehr
 # [=1977-09-23], the clocks were pulled back by 30 minutes.
 # In this way, from the 4th day of the month Farvardin, clocks will be ahead
 # of the previous years by one hour and a half.
 # According to the new program, during the night of 4th of Farvardin, when
 # the midnight, meaning 24 o'clock is announced, the hands of the clock must
 # be pulled forward by one hour and thus consider midnight 1 o'clock in the
 # forenoon."
 #
 # This implies that in September 1977, when the daylight savings time was
 # done with, Iran didn't go back to +03:30, but immediately to +04:00.
 #
 #
 # This is from the major Iranian newspaper Ettela'at, dated [1978-08-03]...,
 # page 32. It looks like they decided to get the clocks back to +4:00
 # just in time for Ramadan that year:
 #
 # "Tomorrow Night, Pull the Clocks Back by One Hour
 # At 1 o'clock in the forenoon of Saturday 14 Mordad [=1978-08-05], the
 # clocks will be pulled one hour back and instead of 1 o'clock in the
 # forenoon, Radio Iran will announce 24 o'clock.
 # This decision was made in the Cabinet of Ministers meeting of 25 Tir
 # [=1978-07-16], [...]
 # At the beginning of the year 2537 [=March 1978: Iran was using a different
 # year number for a few years then, based on the Coronation of Cyrus the
 # Great], the country's official time was pulled forward by one hour and now
 # the official time is one hour and a half ahead compared to last year,
 # because in Farvardin of last year [=March 1977], the official time was
 # pulled forward one hour and this continued until the second half of last
 # year [=September 1977] until in the second half of last year the official
 # time was pulled back half an hour and that half hour still remains."
 #
 # This matches the time of the true noon published in the newspapers, as they
 # clearly go from +05:00 to +04:00 after that date (which happened during a
 # long weekend in Iran).
 
 # From Roozbeh Pournader (2022-05-31):
 # [Movahedi S. Cultural preconceptions of time: Can we use operational time
 # to meddle in God's Time? Comp Stud Soc Hist. 1985;27(3):385-400]
 # https://www.jstor.org/stable/178704
 # Here's the quotes from the paper:
 # 1. '"Iran's official time keeper moved the clock one hour forward as from
 # March 22, 1977 (Farvardin 2, 2536) to make maximum use of daylight and save
 # in energy consumption. Thus Iran joined such other countries as Britain in
 # observing what is known as 'daylight saving.' The proposal was originally
 # put forward by the Ministry of Energy, in no way having any influence on
 # observing religious ceremonies. Moving time one hour forward in summer
 # means that at 11:00 o'clock on March 21, the official time was set as
 # midnight March 22. Then September 24 will actually begin one hour later
 # than the end of September 23 [...]." Iran's time base thus continued to be
 # Greenwich Mean Time plus three and one-half hours (plus four and one-half
 # hours in summer).'
 #
 # The article sources this from Iran Almanac and Book of Facts, 1977, Tehran:
 # Echo of Iran, which is on Google Books at
 # https://www.google.com/books/edition/Iran_Almanac_and_Book_of_Facts/9ybVAAAAMAAJ.
 # (I confirmed it by searching for snippets.)
 #
 # 2. "After the fall of the shah, the revolutionary government returned to
 # daylight-saving time (DST) on 26 May 1979."
 #
 # This seems to have been announced just one day in advance, on 25 May 1979.
 #
 # The change in 1977 clearly seems to be the first daylight savings effort in
 # Iran. But the article doesn't mention what happened in 1978 (which was
 # still during the shah's government), or how things continued in 1979
 # onwards (which was during the Islamic Republic).
 
 # From Francis Santoni (2022-06-01):
 # for Iran and 1977 the effective change is only 20 October
 # (UIT No. 143 17.XI.1977) and not 23 September (UIT No. 141 13.IX.1977).
 # UIT is the Operational Bulletin of International Telecommunication Union.
 
 # From Roozbeh Pournader (2003-03-15):
 # This is an English translation of what I just found (originally in Persian).
 # The Gregorian dates in brackets are mine:
 #
 #	Official Newspaper No. 13548-1370/6/25 [1991-09-16]
 #	No. 16760/T233 H				1370/6/10 [1991-09-01]
 #
 #	The Rule About Change of the Official Time of the Country
 #
 #	The Board of Ministers, in the meeting dated 1370/5/23 [1991-08-14],
 #	based on the suggestion number 2221/D dated 1370/4/22 [1991-07-13]
 #	of the Country's Organization for Official and Employment Affairs,
 #	and referring to the law for equating the working hours of workers
 #	and officers in the whole country dated 1359/4/23 [1980-07-14], and
 #	for synchronizing the official times of the country, agreed that:
 #
 #	The official time of the country will should move forward one hour
 #	at the 24[:00] hours of the first day of Farvardin and should return
 #	to its previous state at the 24[:00] hours of the 30th day of
 #	Shahrivar.
 #
 #	First Deputy to the President - Hassan Habibi
 #
 # From personal experience, that agrees with what has been followed
 # for at least the last 5 years.  Before that, for a few years, the
 # date used was the first Thursday night of Farvardin and the last
 # Thursday night of Shahrivar, but I can't give exact dates....
 #
 # From Roozbeh Pournader (2005-04-05):
 # The text of the Iranian law, in effect since 1925, clearly mentions
 # that the true solar year is the measure, and there is no arithmetic
 # leap year calculation involved.  There has never been any serious
 # plan to change that law....
 #
 # From Paul Eggert (2022-06-30):
 # Go with Pournader for 1935 through spring 1979, and for timestamps
 # after August 1991; go with with Shanks & Pottenger for other timestamps.
 # Go with Santoni's citation of the UIT for fall 1977, as 20 October 1977
 # is 28 Mehr 1356, consistent with the "Mehr" in Pournader's source.
 # Assume that the UIT's "1930" is UTC, i.e., 24:00 local time.
 #
 # From Oscar van Vlijmen (2005-03-30), writing about future
 # discrepancies between cal-persia and the Iranian calendar:
 # For 2091 solar-longitude-after yields 2091-03-20 08:40:07.7 UT for
 # the vernal equinox and that gets so close to 12:00 some local
 # Iranian time that the definition of the correct location needs to be
 # known exactly, amongst other factors.  2157 is even closer:
 # 2157-03-20 08:37:15.5 UT.  But the Gregorian year 2025 should give
 # no interpretation problem whatsoever.  By the way, another instant
 # in the near future where there will be a discrepancy between
 # arithmetical and astronomical Iranian calendars will be in 2058:
 # vernal equinox on 2058-03-20 09:03:05.9 UT.  The Java version of
 # Reingold's/Dershowitz' calculator gives correctly the Gregorian date
 # 2058-03-21 for 1 Farvardin 1437 (astronomical).
 #
 # From Steffen Thorsen (2006-03-22):
 # Several of my users have reported that Iran will not observe DST anymore:
 # http://www.irna.ir/en/news/view/line-17/0603193812164948.htm
 #
 # From Reuters (2007-09-16), with a heads-up from Jesper Nørgaard Welen:
 # ... the Guardian Council ... approved a law on Sunday to re-introduce
 # daylight saving time ...
 # https://uk.reuters.com/article/oilRpt/idUKBLA65048420070916
 #
 # From Roozbeh Pournader (2007-11-05):
 # This is quoted from Official Gazette of the Islamic Republic of
 # Iran, Volume 63, No. 18242, dated Tuesday 1386/6/24
 # [2007-10-16]. I am doing the best translation I can:...
 # The official time of the country will be moved forward for one hour
 # on the 24 hours of the first day of the month of Farvardin and will
 # be changed back to its previous state on the 24 hours of the
 # thirtieth day of Shahrivar.
 #
 # From Ali Mirjamali (2022-05-10):
 # Official IR News Agency announcement: irna.ir/xjJ3TT
 # ...
 # Highlights: DST will be cancelled for the next Iranian year 1402
 # (i.e 2023-March-21) and forthcoming years.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Work around a bug in zic 2022a and earlier.
 Rule	Iran	1910	only	-	Jan	 1	00:00	0	-
 #
 Rule	Iran	1977	only	-	Mar	21	23:00	1:00	-
 Rule	Iran	1977	only	-	Oct	20	24:00	0	-
 Rule	Iran	1978	only	-	Mar	24	24:00	1:00	-
 Rule	Iran	1978	only	-	Aug	 5	01:00	0	-
 Rule	Iran	1979	only	-	May	26	24:00	1:00	-
 Rule	Iran	1979	only	-	Sep	18	24:00	0	-
 Rule	Iran	1980	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	1980	only	-	Sep	22	24:00	0	-
 Rule	Iran	1991	only	-	May	 2	24:00	1:00	-
 Rule	Iran	1992	1995	-	Mar	21	24:00	1:00	-
 Rule	Iran	1991	1995	-	Sep	21	24:00	0	-
 Rule	Iran	1996	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	1996	only	-	Sep	20	24:00	0	-
 Rule	Iran	1997	1999	-	Mar	21	24:00	1:00	-
 Rule	Iran	1997	1999	-	Sep	21	24:00	0	-
 Rule	Iran	2000	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2000	only	-	Sep	20	24:00	0	-
 Rule	Iran	2001	2003	-	Mar	21	24:00	1:00	-
 Rule	Iran	2001	2003	-	Sep	21	24:00	0	-
 Rule	Iran	2004	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2004	only	-	Sep	20	24:00	0	-
 Rule	Iran	2005	only	-	Mar	21	24:00	1:00	-
 Rule	Iran	2005	only	-	Sep	21	24:00	0	-
 Rule	Iran	2008	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2008	only	-	Sep	20	24:00	0	-
 Rule	Iran	2009	2011	-	Mar	21	24:00	1:00	-
 Rule	Iran	2009	2011	-	Sep	21	24:00	0	-
 Rule	Iran	2012	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2012	only	-	Sep	20	24:00	0	-
 Rule	Iran	2013	2015	-	Mar	21	24:00	1:00	-
 Rule	Iran	2013	2015	-	Sep	21	24:00	0	-
 Rule	Iran	2016	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2016	only	-	Sep	20	24:00	0	-
 Rule	Iran	2017	2019	-	Mar	21	24:00	1:00	-
 Rule	Iran	2017	2019	-	Sep	21	24:00	0	-
 Rule	Iran	2020	only	-	Mar	20	24:00	1:00	-
 Rule	Iran	2020	only	-	Sep	20	24:00	0	-
 Rule	Iran	2021	2022	-	Mar	21	24:00	1:00	-
 Rule	Iran	2021	2022	-	Sep	21	24:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Tehran	3:25:44	-	LMT	1916
 			3:25:44	-	TMT	1935 Jun 13 # Tehran Mean Time
 			3:30	Iran	+0330/+0430 1977 Oct 20 24:00
 			4:00	Iran	+04/+05	1979
 			3:30	Iran	+0330/+0430
 
 
 # Iraq
 #
 # From Jonathan Lennox (2000-06-12):
 # An article in this week's Economist ("Inside the Saddam-free zone", p. 50 in
 # the U.S. edition) on the Iraqi Kurds contains a paragraph:
 # "The three northern provinces ... switched their clocks this spring and
 # are an hour ahead of Baghdad."
 #
 # But Rives McDow (2000-06-18) quotes a contact in Iraqi-Kurdistan as follows:
 # In the past, some Kurdish nationalists, as a protest to the Iraqi
 # Government, did not adhere to daylight saving time.  They referred
 # to daylight saving as Saddam time.  But, as of today, the time zone
 # in Iraqi-Kurdistan is on standard time with Baghdad, Iraq.
 #
 # So we'll ignore the Economist's claim.
 
 # From Steffen Thorsen (2008-03-10):
 # The cabinet in Iraq abolished DST last week, according to the following
 # news sources (in Arabic):
 # http://www.aljeeran.net/wesima_articles/news-20080305-98602.html
 # http://www.aswataliraq.info/look/article.tpl?id=2047&IdLanguage=17&IdPublication=4&NrArticle=71743&NrIssue=1&NrSection=10
 #
 # We have published a short article in English about the change:
 # https://www.timeanddate.com/news/time/iraq-dumps-daylight-saving.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Iraq	1982	only	-	May	1	0:00	1:00	-
 Rule	Iraq	1982	1984	-	Oct	1	0:00	0	-
 Rule	Iraq	1983	only	-	Mar	31	0:00	1:00	-
 Rule	Iraq	1984	1985	-	Apr	1	0:00	1:00	-
 Rule	Iraq	1985	1990	-	Sep	lastSun	1:00s	0	-
 Rule	Iraq	1986	1990	-	Mar	lastSun	1:00s	1:00	-
 # IATA SSIM (1991/1996) says Apr 1 12:01am UTC; guess the ':01' is a typo.
 # Shanks & Pottenger say Iraq did not observe DST 1992/1997; ignore this.
 #
 Rule	Iraq	1991	2007	-	Apr	 1	3:00s	1:00	-
 Rule	Iraq	1991	2007	-	Oct	 1	3:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Baghdad	2:57:40	-	LMT	1890
 			2:57:36	-	BMT	1918     # Baghdad Mean Time?
 			3:00	-	+03	1982 May
 			3:00	Iraq	+03/+04
 
 
 ###############################################################################
 
 # Israel
 
 # For more info about the motivation for DST in Israel, see:
 # Barak Y. Israel's Daylight Saving Time controversy. Israel Affairs.
 # 2020-08-11. https://doi.org/10.1080/13537121.2020.1806564
 
 # From Ephraim Silverberg (2001-01-11):
 #
 # I coined "IST/IDT" circa 1988.  Until then there were three
 # different abbreviations in use:
 #
 # JST  Jerusalem Standard Time [Danny Braniss, Hebrew University]
 # IZT  Israel Zonal (sic) Time [Prof. Haim Papo, Technion]
 # EEST Eastern Europe Standard Time [used by almost everyone else]
 #
 # Since timezones should be called by country and not capital cities,
 # I ruled out JST.  As Israel is in Asia Minor and not Eastern Europe,
 # EEST was equally unacceptable.  Since "zonal" was not compatible with
 # any other timezone abbreviation, I felt that 'IST' was the way to go
 # and, indeed, it has received almost universal acceptance in timezone
 # settings in Israeli computers.
 #
 # In any case, I am happy to share timezone abbreviations with India,
 # high on my favorite-country list (and not only because my wife's
 # family is from India).
 
 # From P Chan (2020-10-27), with corrections:
 #
 # 1940-1946 Supplement No. 2 to the Palestine Gazette
 # # issue page  Order No.   dated      start        end         note
 # 1 1010  729  67 of 1940 1940-05-22 1940-05-31* 1940-09-30* revoked by #2
 # 2 1013  758  73 of 1940 1940-05-31 1940-05-31  1940-09-30
 # 3 1055 1574 196 of 1940 1940-11-06 1940-11-16  1940-12-31
 # 4 1066 1811 208 of 1940 1940-12-17 1940-12-31  1941-12-31
 # 5 1156 1967 116 of 1941 1941-12-16 1941-12-31  1942-12-31* amended by #6
 # 6 1228 1608  86 of 1942 1942-10-14 1941-12-31  1942-10-31
 # 7 1256  279  21 of 1943 1943-03-18 1943-03-31  1943-10-31
 # 8 1323  249  19 of 1944 1944-03-13 1944-03-31  1944-10-31
 # 9 1402  328  20 of 1945 1945-04-05 1945-04-15  1945-10-31
 #10 1487  596  14 of 1946 1946-04-04 1946-04-15  1946-10-31
 #
 # 1948 Iton Rishmi (Official Gazette of the Provisional Government)
 # #    issue    page   dated      start       end
 #11 2             7 1948-05-20 1948-05-22 1948-10-31*
 #	^This moved timezone to +04, replaced by #12 from 1948-08-31 24:00 GMT.
 #12 17 (Annex B) 84 1948-08-22 1948-08-31 1948-10-31
 #
 # 1949-2000 Kovetz HaTakanot (Collection of Regulations)
 # # issue page  dated      start       end            note
 #13    6  133 1949-03-23 1949-04-30  1949-10-31
 #14   80  755 1950-03-17 1950-04-15  1950-09-14
 #15  164  782 1951-03-22 1951-03-31  1951-09-29* amended by #16
 #16  206 1940 1951-09-23 ----------  1951-10-22* amended by #17
 #17  212   78 1951-10-19 ----------  1951-11-10
 #18  254  652 1952-03-03 1952-04-19  1952-09-27* amended by #19
 #19  300   11 1952-09-15 ----------  1952-10-18
 #20  348  817 1953-03-03 1953-04-11  1953-09-12
 #21  420  385 1954-02-17 1954-06-12  1954-09-11
 #22  497  548 1955-01-14 1955-06-11  1955-09-10
 #23  591  608 1956-03-12 1956-06-02  1956-09-29
 #24  680  957 1957-02-08 1957-04-27  1957-09-21
 #25 3192 1418 1974-06-28 1974-07-06  1974-10-12
 #26 3322 1389 1975-04-03 1975-04-19  1975-08-30
 #27 4146 2089 1980-07-15 1980-08-02  1980-09-13
 #28 4604 1081 1984-02-22 1984-05-05* 1984-08-25* revoked by #29
 #29 4619 1312 1984-04-06 1984-05-05  1984-08-25
 #30 4744  475 1984-12-23 1985-04-13  1985-09-14* amended by #31
 #31 4851 1848 1985-08-18 ----------  1985-08-31
 #32 4932  899 1986-04-22 1986-05-17  1986-09-06
 #33 5013  580 1987-02-15 1987-04-18* 1987-08-22* revoked by #34
 #34 5021  744 1987-03-30 1987-04-14  1987-09-12
 #35 5096  659 1988-02-14 1988-04-09  1988-09-03
 #36 5167  514 1989-02-03 1989-04-29  1989-09-02
 #37 5248  375 1990-01-23 1990-03-24  1990-08-25
 #38 5335  612 1991-02-10 1991-03-09* 1991-08-31	 amended by #39
 #			 1992-03-28  1992-09-05
 #39 5339  709 1991-03-04 1991-03-23  ----------
 #40 5506  503 1993-02-18 1993-04-02  1993-09-05
 #			 1994-04-01  1994-08-28
 #			 1995-03-31  1995-09-03
 #41 5731  438 1996-01-01 1996-03-14  1996-09-15
 #			 1997-03-13* 1997-09-18* overridden by 1997 Temp Prov
 #			 1998-03-19* 1998-09-17* revoked by #42
 #42 5853 1243 1997-09-18 1998-03-19  1998-09-05
 #43 5937   77 1998-10-18 1999-04-02  1999-09-03
 #			 2000-04-14* 2000-09-15* revoked by #44
 #			 2001-04-13* 2001-09-14* revoked by #44
 #44 6024   39 2000-03-14 2000-04-14  2000-10-22* overridden by 2000 Temp Prov
 #			 2001-04-06* 2001-10-10* overridden by 2000 Temp Prov
 #			 2002-03-29* 2002-10-29* overridden by 2000 Temp Prov
 #
 # These are laws enacted by the Knesset since the Minister could only alter the
 # transition dates at least six months in advanced under the 1992 Law.
 #				dated		start		end
 # 1997 Temporary Provisions	1997-03-06	1997-03-20	1997-09-13
 # 2000 Temporary Provisions	2000-07-28	----------	2000-10-06
 #						2001-04-09	2001-09-24
 #						2002-03-29	2002-10-07
 #						2003-03-28	2003-10-03
 #						2004-04-07	2004-09-22
 # Note:
 # Transition times in 1940-1957 (#1-#24) were midnight GMT,
 # in 1974-1998 (#25-#42 and the 1997 Temporary Provisions) were midnight,
 # in 1999-April 2000 (#43,#44) were 02:00,
 # in the 2000 Temporary Provisions were 01:00.
 #
 # -----------------------------------------------------------------------------
 # Links:
 # 1 https://findit.library.yale.edu/images_layout/view?parentoid=15537490&increment=687
 # 2 https://findit.library.yale.edu/images_layout/view?parentoid=15537490&increment=716
 # 3 https://findit.library.yale.edu/images_layout/view?parentoid=15537491&increment=721
 # 4 https://findit.library.yale.edu/images_layout/view?parentoid=15537491&increment=958
 # 5 https://findit.library.yale.edu/images_layout/view?parentoid=15537502&increment=558
 # 6 https://findit.library.yale.edu/images_layout/view?parentoid=15537511&increment=105
 # 7 https://findit.library.yale.edu/images_layout/view?parentoid=15537516&increment=278
 # 8 https://findit.library.yale.edu/images_layout/view?parentoid=15537522&increment=248
 # 9 https://findit.library.yale.edu/images_layout/view?parentoid=15537530&increment=329
 #10 https://findit.library.yale.edu/images_layout/view?parentoid=15537537&increment=601
 #11 https://www.nevo.co.il/law_word/law12/er-002.pdf#page=3
 #12 https://www.nevo.co.il/law_word/law12/er-017-t2.pdf#page=4
 #13 https://www.nevo.co.il/law_word/law06/tak-0006.pdf#page=3
 #14 https://www.nevo.co.il/law_word/law06/tak-0080.pdf#page=7
 #15 https://www.nevo.co.il/law_word/law06/tak-0164.pdf#page=10
 #16 https://www.nevo.co.il/law_word/law06/tak-0206.pdf#page=4
 #17 https://www.nevo.co.il/law_word/law06/tak-0212.pdf#page=2
 #18 https://www.nevo.co.il/law_word/law06/tak-0254.pdf#page=4
 #19 https://www.nevo.co.il/law_word/law06/tak-0300.pdf#page=5
 #20 https://www.nevo.co.il/law_word/law06/tak-0348.pdf#page=3
 #21 https://www.nevo.co.il/law_word/law06/tak-0420.pdf#page=5
 #22 https://www.nevo.co.il/law_word/law06/tak-0497.pdf#page=10
 #23 https://www.nevo.co.il/law_word/law06/tak-0591.pdf#page=6
 #24 https://www.nevo.co.il/law_word/law06/tak-0680.pdf#page=3
 #25 https://www.nevo.co.il/law_word/law06/tak-3192.pdf#page=2
 #26 https://www.nevo.co.il/law_word/law06/tak-3322.pdf#page=5
 #27 https://www.nevo.co.il/law_word/law06/tak-4146.pdf#page=2
 #28 https://www.nevo.co.il/law_word/law06/tak-4604.pdf#page=7
 #29 https://www.nevo.co.il/law_word/law06/tak-4619.pdf#page=2
 #30 https://www.nevo.co.il/law_word/law06/tak-4744.pdf#page=11
 #31 https://www.nevo.co.il/law_word/law06/tak-4851.pdf#page=2
 #32 https://www.nevo.co.il/law_word/law06/tak-4932.pdf#page=19
 #33 https://www.nevo.co.il/law_word/law06/tak-5013.pdf#page=8
 #34 https://www.nevo.co.il/law_word/law06/tak-5021.pdf#page=8
 #35 https://www.nevo.co.il/law_word/law06/tak-5096.pdf#page=3
 #36 https://www.nevo.co.il/law_word/law06/tak-5167.pdf#page=2
 #37 https://www.nevo.co.il/law_word/law06/tak-5248.pdf#page=7
 #38 https://www.nevo.co.il/law_word/law06/tak-5335.pdf#page=6
 #39 https://www.nevo.co.il/law_word/law06/tak-5339.pdf#page=7
 #40 https://www.nevo.co.il/law_word/law06/tak-5506.pdf#page=19
 #41 https://www.nevo.co.il/law_word/law06/tak-5731.pdf#page=2
 #42 https://www.nevo.co.il/law_word/law06/tak-5853.pdf#page=3
 #43 https://www.nevo.co.il/law_word/law06/tak-5937.pdf#page=9
 #44 https://www.nevo.co.il/law_word/law06/tak-6024.pdf#page=4
 #
 # Time Determination (Temporary Provisions) Law, 1997
 # https://www.nevo.co.il/law_html/law19/p201_003.htm
 #
 # Time Determination (Temporary Provisions) Law, 2000
 # https://www.nevo.co.il/law_html/law19/p201_004.htm
 #
 # Time Determination Law, 1992 and amendments
 # https://www.nevo.co.il/law_html/law01/p201_002.htm
 # https://main.knesset.gov.il/Activity/Legislation/Laws/Pages/LawPrimary.aspx?lawitemid=2001174
 
 # From Paul Eggert (2020-10-27):
 # Several of the midnight transitions mentioned above are ambiguous;
 # are they 00:00, 00:00s, 24:00, or 24:00s?  When resolving these ambiguities,
 # try to minimize changes from previous tzdb versions, for lack of better info.
 # Commentary from previous versions is included below, to help explain this.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	1940	only	-	May	31	24:00u	1:00	D
 Rule	Zion	1940	only	-	Sep	30	24:00u	0	S
 Rule	Zion	1940	only	-	Nov	16	24:00u	1:00	D
 Rule	Zion	1942	1946	-	Oct	31	24:00u	0	S
 Rule	Zion	1943	1944	-	Mar	31	24:00u	1:00	D
 Rule	Zion	1945	1946	-	Apr	15	24:00u	1:00	D
 Rule	Zion	1948	only	-	May	22	24:00u	2:00	DD
 Rule	Zion	1948	only	-	Aug	31	24:00u	1:00	D
 Rule	Zion	1948	1949	-	Oct	31	24:00u	0	S
 Rule	Zion	1949	only	-	Apr	30	24:00u	1:00	D
 Rule	Zion	1950	only	-	Apr	15	24:00u	1:00	D
 Rule	Zion	1950	only	-	Sep	14	24:00u	0	S
 Rule	Zion	1951	only	-	Mar	31	24:00u	1:00	D
 Rule	Zion	1951	only	-	Nov	10	24:00u	0	S
 Rule	Zion	1952	only	-	Apr	19	24:00u	1:00	D
 Rule	Zion	1952	only	-	Oct	18	24:00u	0	S
 Rule	Zion	1953	only	-	Apr	11	24:00u	1:00	D
 Rule	Zion	1953	only	-	Sep	12	24:00u	0	S
 Rule	Zion	1954	only	-	Jun	12	24:00u	1:00	D
 Rule	Zion	1954	only	-	Sep	11	24:00u	0	S
 Rule	Zion	1955	only	-	Jun	11	24:00u	1:00	D
 Rule	Zion	1955	only	-	Sep	10	24:00u	0	S
 Rule	Zion	1956	only	-	Jun	 2	24:00u	1:00	D
 Rule	Zion	1956	only	-	Sep	29	24:00u	0	S
 Rule	Zion	1957	only	-	Apr	27	24:00u	1:00	D
 Rule	Zion	1957	only	-	Sep	21	24:00u	0	S
 Rule	Zion	1974	only	-	Jul	 6	24:00	1:00	D
 Rule	Zion	1974	only	-	Oct	12	24:00	0	S
 Rule	Zion	1975	only	-	Apr	19	24:00	1:00	D
 Rule	Zion	1975	only	-	Aug	30	24:00	0	S
 
 # From Alois Treindl (2019-03-06):
 # http://www.moin.gov.il/Documents/שעון%20קיץ/clock-50-years-7-2014.pdf
 # From Isaac Starkman (2019-03-06):
 # Summer time was in that period in 1980 and 1984, see
 # https://www.ynet.co.il/articles/0,7340,L-3951073,00.html
 # You can of course read it in translation.
 # I checked the local newspapers for that years.
 # It started on midnight and end at 01.00 am.
 # From Paul Eggert (2019-03-06):
 # Also see this thread about the moin.gov.il URL:
 # https://mm.icann.org/pipermail/tz/2018-November/027194.html
 Rule	Zion	1980	only	-	Aug	 2	24:00s	1:00	D
 Rule	Zion	1980	only	-	Sep	13	24:00s	0	S
 Rule	Zion	1984	only	-	May	 5	24:00s	1:00	D
 Rule	Zion	1984	only	-	Aug	25	24:00s	0	S
 
 Rule	Zion	1985	only	-	Apr	13	24:00	1:00	D
 Rule	Zion	1985	only	-	Aug	31	24:00	0	S
 Rule	Zion	1986	only	-	May	17	24:00	1:00	D
 Rule	Zion	1986	only	-	Sep	 6	24:00	0	S
 Rule	Zion	1987	only	-	Apr	14	24:00	1:00	D
 Rule	Zion	1987	only	-	Sep	12	24:00	0	S
 
 # From Avigdor Finkelstein (2014-03-05):
 # I check the Parliament (Knesset) records and there it's stated that the
 # [1988] transition should take place on Saturday night, when the Sabbath
 # ends and changes to Sunday.
 Rule	Zion	1988	only	-	Apr	 9	24:00	1:00	D
 Rule	Zion	1988	only	-	Sep	 3	24:00	0	S
 
 # From Ephraim Silverberg
 # (1997-03-04, 1998-03-16, 1998-12-28, 2000-01-17, 2000-07-25, 2004-12-22,
 # and 2005-02-17):
 
 # According to the Office of the Secretary General of the Ministry of
 # Interior, there is NO set rule for Daylight-Savings/Standard time changes.
 # One thing is entrenched in law, however: that there must be at least 150
 # days of daylight savings time annually.  From 1993-1998, the change to
 # daylight savings time was on a Friday morning from midnight IST to
 # 1 a.m IDT; up until 1998, the change back to standard time was on a
 # Saturday night from midnight daylight savings time to 11 p.m. standard
 # time.  1996 is an exception to this rule where the change back to standard
 # time took place on Sunday night instead of Saturday night to avoid
 # conflicts with the Jewish New Year.  In 1999, the change to
 # daylight savings time was still on a Friday morning but from
 # 2 a.m. IST to 3 a.m. IDT; furthermore, the change back to standard time
 # was also on a Friday morning from 2 a.m. IDT to 1 a.m. IST for
 # 1999 only.  In the year 2000, the change to daylight savings time was
 # similar to 1999, but although the change back will be on a Friday, it
 # will take place from 1 a.m. IDT to midnight IST.  Starting in 2001, all
 # changes to/from will take place at 1 a.m. old time, but now there is no
 # rule as to what day of the week it will take place in as the start date
 # (except in 2003) is the night after the Passover Seder (i.e. the eve
 # of the 16th of Nisan in the lunar Hebrew calendar) and the end date
 # (except in 2002) is three nights before Yom Kippur [Day of Atonement]
 # (the eve of the 7th of Tishrei in the lunar Hebrew calendar).
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	1989	only	-	Apr	29	24:00	1:00	D
 Rule	Zion	1989	only	-	Sep	 2	24:00	0	S
 Rule	Zion	1990	only	-	Mar	24	24:00	1:00	D
 Rule	Zion	1990	only	-	Aug	25	24:00	0	S
 Rule	Zion	1991	only	-	Mar	23	24:00	1:00	D
 Rule	Zion	1991	only	-	Aug	31	24:00	0	S
 Rule	Zion	1992	only	-	Mar	28	24:00	1:00	D
 Rule	Zion	1992	only	-	Sep	 5	24:00	0	S
 Rule	Zion	1993	only	-	Apr	 2	0:00	1:00	D
 Rule	Zion	1993	only	-	Sep	 5	0:00	0	S
 
 # The dates for 1994-1995 were obtained from Office of the Spokeswoman for the
 # Ministry of Interior, Jerusalem, Israel.  The spokeswoman can be reached by
 # calling the office directly at 972-2-6701447 or 972-2-6701448.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	1994	only	-	Apr	 1	0:00	1:00	D
 Rule	Zion	1994	only	-	Aug	28	0:00	0	S
 Rule	Zion	1995	only	-	Mar	31	0:00	1:00	D
 Rule	Zion	1995	only	-	Sep	 3	0:00	0	S
 
 # The dates for 1996 were determined by the Minister of Interior of the
 # time, Haim Ramon.  The official announcement regarding 1996-1998
 # (with the dates for 1997-1998 no longer being relevant) can be viewed at:
 #
 #   ftp://ftp.cs.huji.ac.il/pub/tz/announcements/1996-1998.ramon.ps.gz
 #
 # The dates for 1997-1998 were altered by his successor, Rabbi Eli Suissa.
 #
 # The official announcements for the years 1997-1999 can be viewed at:
 #
 #   ftp://ftp.cs.huji.ac.il/pub/tz/announcements/YYYY.ps.gz
 #
 #       where YYYY is the relevant year.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	1996	only	-	Mar	14	24:00	1:00	D
 Rule	Zion	1996	only	-	Sep	15	24:00	0	S
 Rule	Zion	1997	only	-	Mar	20	24:00	1:00	D
 Rule	Zion	1997	only	-	Sep	13	24:00	0	S
 Rule	Zion	1998	only	-	Mar	20	0:00	1:00	D
 Rule	Zion	1998	only	-	Sep	 6	0:00	0	S
 Rule	Zion	1999	only	-	Apr	 2	2:00	1:00	D
 Rule	Zion	1999	only	-	Sep	 3	2:00	0	S
 
 # The Knesset Interior Committee has changed the dates for 2000 for
 # the third time in just over a year and have set new dates for the
 # years 2001-2004 as well.
 #
 # The official announcement for the start date of 2000 can be viewed at:
 #
 #	ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-start.ps.gz
 #
 # The official announcement for the end date of 2000 and the dates
 # for the years 2001-2004 can be viewed at:
 #
 #	ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-2004.ps.gz
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	2000	only	-	Apr	14	2:00	1:00	D
 Rule	Zion	2000	only	-	Oct	 6	1:00	0	S
 Rule	Zion	2001	only	-	Apr	 9	1:00	1:00	D
 Rule	Zion	2001	only	-	Sep	24	1:00	0	S
 Rule	Zion	2002	only	-	Mar	29	1:00	1:00	D
 Rule	Zion	2002	only	-	Oct	 7	1:00	0	S
 Rule	Zion	2003	only	-	Mar	28	1:00	1:00	D
 Rule	Zion	2003	only	-	Oct	 3	1:00	0	S
 Rule	Zion	2004	only	-	Apr	 7	1:00	1:00	D
 Rule	Zion	2004	only	-	Sep	22	1:00	0	S
 
 # The proposed law agreed upon by the Knesset Interior Committee on
 # 2005-02-14 is that, for 2005 and beyond, DST starts at 02:00 the
 # last Friday before April 2nd (i.e. the last Friday in March or April
 # 1st itself if it falls on a Friday) and ends at 02:00 on the Saturday
 # night _before_ the fast of Yom Kippur.
 #
 # Those who can read Hebrew can view the announcement at:
 #
 #	ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2005+beyond.ps
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	2005	2012	-	Apr	Fri<=1	2:00	1:00	D
 Rule	Zion	2005	only	-	Oct	 9	2:00	0	S
 Rule	Zion	2006	only	-	Oct	 1	2:00	0	S
 Rule	Zion	2007	only	-	Sep	16	2:00	0	S
 Rule	Zion	2008	only	-	Oct	 5	2:00	0	S
 Rule	Zion	2009	only	-	Sep	27	2:00	0	S
 Rule	Zion	2010	only	-	Sep	12	2:00	0	S
 Rule	Zion	2011	only	-	Oct	 2	2:00	0	S
 Rule	Zion	2012	only	-	Sep	23	2:00	0	S
 
 # From Ephraim Silverberg (2020-10-26):
 # The current time law (2013) from the State of Israel can be viewed
 # (in Hebrew) at:
 # ftp://ftp.cs.huji.ac.il/pub/tz/israel/announcements/2013+law.pdf
 # It translates to:
 # Every year, in the period from the Friday before the last Sunday in
 # the month of March at 02:00 a.m. until the last Sunday of the month
 # of October at 02:00 a.m., Israel Time will be advanced an additional
 # hour such that it will be UTC+3.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Zion	2013	max	-	Mar	Fri>=23	2:00	1:00	D
 Rule	Zion	2013	max	-	Oct	lastSun	2:00	0	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Jerusalem	2:20:54 -	LMT	1880
 			2:20:40	-	JMT	1918 # Jerusalem Mean Time?
 			2:00	Zion	I%sT
 
 
 
 ###############################################################################
 
 # Japan
 
 # '9:00' and 'JST' is from Guy Harris.
 
 # From Paul Eggert (2020-01-19):
 # Starting in the 7th century, Japan generally followed an ancient Chinese
 # timekeeping system that divided night and day into six hours each,
 # with hour length depending on season.  In 1873 the government
 # started requiring the use of a Western style 24-hour clock.  See:
 # Yulia Frumer, "Making Time: Astronomical Time Measurement in Tokugawa Japan"
 # .  As the tzdb code and
 # data support only 24-hour clocks, its tables model timestamps before
 # 1873 using Western-style local mean time.
 
 # From Hideyuki Suzuki (1998-11-09):
 # 'Tokyo' usually stands for the former location of Tokyo Astronomical
 # Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
 # This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
 # edited by National Astronomical Observatory of Japan....
 # JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
 # The law is enacted on 1886-07-07.
 
 # From Hideyuki Suzuki (1998-11-16):
 # The ordinance No. 51 (1886) established "standard time" in Japan,
 # which stands for the time on 135° E.
 # In the ordinance No. 167 (1895), "standard time" was renamed to "central
 # standard time".  And the same ordinance also established "western standard
 # time", which stands for the time on 120° E....  But "western standard
 # time" was abolished in the ordinance No. 529 (1937).  In the ordinance No.
 # 167, there is no mention regarding for what place western standard time is
 # standard....
 #
 # I wrote "ordinance" above, but I don't know how to translate.
 # In Japanese it's "chokurei", which means ordinance from emperor.
 
 # From Yu-Cheng Chuang (2013-07-12):
 # ...the Meiji Emperor announced Ordinance No. 167 of Meiji Year 28 "The clause
 # about standard time" ... The adoption began from Jan 1, 1896.
 # https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
 #
 # ...the Showa Emperor announced Ordinance No. 529 of Showa Year 12 ... which
 # means the whole Japan territory, including later occupations, adopt Japan
 # Central Time (UT+9). The adoption began on Oct 1, 1937.
 # https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
 
 # From Paul Eggert (1995-03-06):
 # Today's _Asahi Evening News_ (page 4) reports that Japan had
 # daylight saving between 1948 and 1951, but "the system was discontinued
 # because the public believed it would lead to longer working hours."
 
 # From Mayumi Negishi in the 2005-08-10 Japan Times:
 # http://www.japantimes.co.jp/cgi-bin/getarticle.pl5?nn20050810f2.htm
 # Occupation authorities imposed daylight-saving time on Japan on
 # [1948-05-01]....  But lack of prior debate and the execution of
 # daylight-saving time just three days after the bill was passed generated
 # deep hatred of the concept....  The Diet unceremoniously passed a bill to
 # dump the unpopular system in October 1951, less than a month after the San
 # Francisco Peace Treaty was signed.  (A government poll in 1951 showed 53%
 # of the Japanese wanted to scrap daylight-saving time, as opposed to 30% who
 # wanted to keep it.)
 
 # From Takayuki Nikai (2018-01-19):
 # The source of information is Japanese law.
 # http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00219480428029.htm
 # http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00719500331039.htm
 # ... In summary, it is written as follows.  From 24:00 on the first Saturday
 # in May, until 0:00 on the day after the second Saturday in September.
 
 # From Phake Nick (2018-09-27):
 # [T]he webpage authored by National Astronomical Observatory of Japan
 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EF.html
 # ... mentioned that using Showa 23 (year 1948) as example, 13pm of September
 # 11 in summer time will equal to 0am of September 12 in standard time.
 # It cited a document issued by the Liaison Office which briefly existed
 # during the postwar period of Japan, where the detail on implementation
 # of the summer time is described in the document.
 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EFB2C6BBFEB9EFA4CEBCC2BBDCA4CBA4C4A4A4A4C6.pdf
 # The text in the document do instruct a fall back to occur at
 # September 11, 13pm in summer time, while ordinary citizens can
 # change the clock before they sleep.
 #
 # From Paul Eggert (2018-09-27):
 # This instruction is equivalent to "Sat>=8 25:00", so use that.  zic treats
 # it like "Sun>=9 01:00", which is not quite the same but is the best we can
 # do in any POSIX or C platform.  The "25:00" assumes zic from 2007 or later,
 # which should be safe now.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Japan	1948	only	-	May	Sat>=1	24:00	1:00	D
 Rule	Japan	1948	1951	-	Sep	Sat>=8	25:00	0	S
 Rule	Japan	1949	only	-	Apr	Sat>=1	24:00	1:00	D
 Rule	Japan	1950	1951	-	May	Sat>=1	24:00	1:00	D
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Tokyo	9:18:59	-	LMT	1887 Dec 31 15:00u
 			9:00	Japan	J%sT
 # Since 1938, all Japanese possessions have been like Asia/Tokyo,
 # except that Truk (Chuuk), Ponape (Pohnpei), and Jaluit (Kosrae) did not
 # switch from +10 to +09 until 1941-04-01; see the 'australasia' file.
 
 # Jordan
 #
 # From 
 # Jordan Week (1999-07-01) via Steffen Thorsen (1999-09-09):
 # Clocks in Jordan were forwarded one hour on Wednesday at midnight,
 # in accordance with the government's decision to implement summer time
 # all year round.
 #
 # From 
 # Jordan Week (1999-09-30) via Steffen Thorsen (1999-11-09):
 # Winter time starts today Thursday, 30 September. Clocks will be turned back
 # by one hour.  This is the latest government decision and it's final!
 # The decision was taken because of the increase in working hours in
 # government's departments from six to seven hours.
 #
 # From Paul Eggert (2005-11-22):
 # Starting 2003 transitions are from Steffen Thorsen's web site timeanddate.com.
 #
 # From Steffen Thorsen (2005-11-23):
 # For Jordan I have received multiple independent user reports every year
 # about DST end dates, as the end-rule is different every year.
 #
 # From Steffen Thorsen (2006-10-01), after a heads-up from Hilal Malawi:
 # http://www.petranews.gov.jo/nepras/2006/Sep/05/4000.htm
 # "Jordan will switch to winter time on Friday, October 27".
 #
 
 # From Steffen Thorsen (2009-04-02):
 # This single one might be good enough, (2009-03-24, Arabic):
 # http://petra.gov.jo/Artical.aspx?Lng=2&Section=8&Artical=95279
 #
 # Google's translation:
 #
 # > The Council of Ministers decided in 2002 to adopt the principle of timely
 # > submission of the summer at 60 minutes as of midnight on the last Thursday
 # > of the month of March of each year.
 #
 # So - this means the midnight between Thursday and Friday since 2002.
 
 # From Arthur David Olson (2009-04-06):
 # We still have Jordan switching to DST on Thursdays in 2000 and 2001.
 
 # From Steffen Thorsen (2012-10-25):
 # Yesterday the government in Jordan announced that they will not
 # switch back to standard time this winter, so the will stay on DST
 # until about the same time next year (at least).
 # http://www.petra.gov.jo/Public_News/Nws_NewsDetails.aspx?NewsID=88950
 
 # From Steffen Thorsen (2013-12-11):
 # Jordan Times and other sources say that Jordan is going back to
 # UTC+2 on 2013-12-19 at midnight:
 # http://jordantimes.com/govt-decides-to-switch-back-to-wintertime
 # Official, in Arabic:
 # http://www.petra.gov.jo/public_news/Nws_NewsDetails.aspx?Menu_ID=&Site_Id=2&lang=1&NewsID=133230&CatID=14
 # ... Our background/permalink about it
 # https://www.timeanddate.com/news/time/jordan-reverses-dst-decision.html
 # ...
 # http://www.petra.gov.jo/Public_News/Nws_NewsDetails.aspx?lang=2&site_id=1&NewsID=133313&Type=P
 # ... says midnight for the coming one and 1:00 for the ones in the future
 # (and they will use DST again next year, using the normal schedule).
 
 # From Paul Eggert (2013-12-11):
 # As Steffen suggested, consider the past 21-month experiment to be DST.
 
 # From Steffen Thorsen (2021-09-24):
 # The Jordanian Government announced yesterday that they will start DST
 # in February instead of March:
 # https://petra.gov.jo/Include/InnerPage.jsp?ID=37683&lang=en&name=en_news (English)
 # https://petra.gov.jo/Include/InnerPage.jsp?ID=189969&lang=ar&name=news (Arabic)
 # From the Arabic version, it seems to say it would be at midnight
 # (assume 24:00) on the last Thursday in February, starting from 2022.
 
 # From Issam Al-Zuwairi (2022-10-05):
 # The Council of Ministers in Jordan decided Wednesday 5th October 2022,
 # that daylight saving time (DST) will be throughout the year....
 #
 # From Brian Inglis (2022-10-06):
 # https://petra.gov.jo/Include/InnerPage.jsp?ID=45567&lang=en&name=en_news
 #
 # From Paul Eggert (2022-10-05):
 # Like Syria, model this as a transition from EEST +03 (DST) to plain +03
 # (non-DST) at the point where DST would otherwise have ended.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Jordan	1973	only	-	Jun	6	0:00	1:00	S
 Rule	Jordan	1973	1975	-	Oct	1	0:00	0	-
 Rule	Jordan	1974	1977	-	May	1	0:00	1:00	S
 Rule	Jordan	1976	only	-	Nov	1	0:00	0	-
 Rule	Jordan	1977	only	-	Oct	1	0:00	0	-
 Rule	Jordan	1978	only	-	Apr	30	0:00	1:00	S
 Rule	Jordan	1978	only	-	Sep	30	0:00	0	-
 Rule	Jordan	1985	only	-	Apr	1	0:00	1:00	S
 Rule	Jordan	1985	only	-	Oct	1	0:00	0	-
 Rule	Jordan	1986	1988	-	Apr	Fri>=1	0:00	1:00	S
 Rule	Jordan	1986	1990	-	Oct	Fri>=1	0:00	0	-
 Rule	Jordan	1989	only	-	May	8	0:00	1:00	S
 Rule	Jordan	1990	only	-	Apr	27	0:00	1:00	S
 Rule	Jordan	1991	only	-	Apr	17	0:00	1:00	S
 Rule	Jordan	1991	only	-	Sep	27	0:00	0	-
 Rule	Jordan	1992	only	-	Apr	10	0:00	1:00	S
 Rule	Jordan	1992	1993	-	Oct	Fri>=1	0:00	0	-
 Rule	Jordan	1993	1998	-	Apr	Fri>=1	0:00	1:00	S
 Rule	Jordan	1994	only	-	Sep	Fri>=15	0:00	0	-
 Rule	Jordan	1995	1998	-	Sep	Fri>=15	0:00s	0	-
 Rule	Jordan	1999	only	-	Jul	 1	0:00s	1:00	S
 Rule	Jordan	1999	2002	-	Sep	lastFri	0:00s	0	-
 Rule	Jordan	2000	2001	-	Mar	lastThu	0:00s	1:00	S
 Rule	Jordan	2002	2012	-	Mar	lastThu	24:00	1:00	S
 Rule	Jordan	2003	only	-	Oct	24	0:00s	0	-
 Rule	Jordan	2004	only	-	Oct	15	0:00s	0	-
 Rule	Jordan	2005	only	-	Sep	lastFri	0:00s	0	-
 Rule	Jordan	2006	2011	-	Oct	lastFri	0:00s	0	-
 Rule	Jordan	2013	only	-	Dec	20	0:00	0	-
 Rule	Jordan	2014	2021	-	Mar	lastThu	24:00	1:00	S
 Rule	Jordan	2014	2022	-	Oct	lastFri	0:00s	0	-
 Rule	Jordan	2022	only	-	Feb	lastThu	24:00	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Amman	2:23:44 -	LMT	1931
 			2:00	Jordan	EE%sT	2022 Oct 28 0:00s
 			3:00	-	+03
 
 
 # Kazakhstan
 
 # From Kazakhstan Embassy's News Bulletin No. 11
 #  (2005-03-21):
 # The Government of Kazakhstan passed a resolution March 15 abolishing
 # daylight saving time citing lack of economic benefits and health
 # complications coupled with a decrease in productivity.
 #
 # From Branislav Kojic (in Astana) via Gwillim Law (2005-06-28):
 # ... what happened was that the former Kazakhstan Eastern time zone
 # was "blended" with the Central zone.  Therefore, Kazakhstan now has
 # two time zones, and difference between them is one hour.  The zone
 # closer to UTC is the former Western zone (probably still called the
 # same), encompassing four provinces in the west: Aqtöbe, Atyraū,
 # Mangghystaū, and West Kazakhstan.  The other zone encompasses
 # everything else....  I guess that would make Kazakhstan time zones
 # de jure UTC+5 and UTC+6 respectively.
 
 # From Stepan Golosunov (2016-03-27):
 # Review of the linked documents from http://adilet.zan.kz/
 # produced the following data for post-1991 Kazakhstan:
 #
 # 0. Act of the Cabinet of Ministers of the USSR
 # from 1991-02-04 No. 20
 # http://pravo.gov.ru/proxy/ips/?docbody=&nd=102010545
 # removed the extra hour ("decree time") on the territory of the USSR
 # starting with the last Sunday of March 1991.
 # It also allowed (but not mandated) Kazakh SSR, Kirghiz SSR, Tajik SSR,
 # Turkmen SSR and Uzbek SSR to not have "summer" time.
 #
 # The 1992-01-13 act also refers to the act of the Cabinet of Ministers
 # of the Kazakh SSR from 1991-03-20 No. 170 "About the act of the Cabinet
 # of Ministers of the USSR from 1991-02-04 No. 20" but I didn't found its
 # text.
 #
 # According to Izvestia newspaper No. 68 (23334) from 1991-03-20
 # -- page 6; available at http://libinfo.org/newsr/newsr2574.djvu via
 # http://libinfo.org/index.php?id=58564 -- on 1991-03-31 at 2:00 during
 # transition to "summer" time:
 # Republic of Georgia, Latvian SSR, Lithuanian SSR, SSR Moldova,
 # Estonian SSR; Komi ASSR; Kaliningrad oblast; Nenets autonomous okrug
 # were to move clocks 1 hour forward.
 # Kazakh SSR (excluding Uralsk oblast); Republic of Kyrgyzstan, Tajik
 # SSR; Andijan, Jizzakh, Namangan, Sirdarya, Tashkent, Fergana oblasts
 # of the Uzbek SSR were to move clocks 1 hour backwards.
 # Other territories were to not move clocks.
 # When the "summer" time would end on 1991-09-29, clocks were to be
 # moved 1 hour backwards on the territory of the USSR excluding
 # Kazakhstan, Kirghizia, Uzbekistan, Turkmenia, Tajikistan.
 #
 # Apparently there were last minute changes. Apparently Kazakh act No. 170
 # was one of such changes.
 #
 # https://ru.wikipedia.org/wiki/Декретное_время
 # claims that Sovetskaya Rossiya newspaper on 1991-03-29 published that
 # Nenets autonomous okrug, Komi and Kazakhstan (excluding Uralsk oblast)
 # were to not move clocks and Uralsk oblast was to move clocks
 # forward; on 1991-09-29 Kazakhstan was to move clocks backwards.
 # (Probably there were changes even after that publication. There is an
 # article claiming that Kaliningrad oblast decided on 1991-03-29 to not
 # move clocks.)
 #
 # This implies that on 1991-03-31 Asia/Oral remained on +04/+05 while
 # the rest of Kazakhstan switched from +06/+07 to +05/06 or from +05/06
 # to +04/+05. It's unclear how Qyzylorda oblast moved into the fifth
 # time belt. (By switching from +04/+05 to +05/+06 on 1991-09-29?) ...
 #
 # 1. Act of the Cabinet of Ministers of the Republic of Kazakhstan
 # from 1992-01-13 No. 28
 # http://adilet.zan.kz/rus/docs/P920000028_
 # (text includes modification from the 1996 act)
 # introduced new rules for calculation of time, mirroring Russian
 # 1992-01-08 act.  It specified that time would be calculated
 # according to time belts plus extra hour ("decree time"), moved clocks
 # on the whole territory of Kazakhstan 1 hour forward on 1992-01-19 at
 # 2:00, specified DST rules.  It acknowledged that Kazakhstan was
 # located in the fourth and the fifth time belts and specified the
 # border between them to be located east of Qostanay and Aktyubinsk
 # oblasts (notably including Turgai and Qyzylorda oblasts into the fifth
 # time belt).
 #
 # This means switch on 1992-01-19 at 2:00 from +04/+05 to +05/+06 for
 # Asia/Aqtau, Asia/Aqtobe, Asia/Oral, Atyraū and Qostanay oblasts; from
 # +05/+06 to +06/+07 for Asia/Almaty and Asia/Qyzylorda (and Arkalyk)....
 #
 # 2. Act of the Cabinet of Ministers of the Republic of Kazakhstan
 # from 1992-03-27 No. 284
 # http://adilet.zan.kz/rus/docs/P920000284_
 # cancels extra hour ("decree time") for Uralsk and Qyzylorda oblasts
 # since the last Sunday of March 1992, while keeping them in the fourth
 # and the fifth time belts respectively.
 #
 # 3. Order of the Prime Minister of the Republic of Kazakhstan
 # from 1994-09-23 No. 384
 # http://adilet.zan.kz/rus/docs/R940000384_
 # cancels the extra hour ("decree time") on the territory of Mangghystaū
 # oblast since the last Sunday of September 1994 (saying that time on
 # the territory would correspond to the third time belt as a
 # result)....
 #
 # 4. Act of the Government of the Republic of Kazakhstan
 # from 1996-05-08 No. 575
 # http://adilet.zan.kz/rus/docs/P960000575_
 # amends the 1992-01-13 act to end summer time in October instead
 # of September, mirroring identical Russian change from 1996-04-23 act.
 #
 # 5. Act of the Government of the Republic of Kazakhstan
 # from 1999-03-26 No. 305
 # http://adilet.zan.kz/rus/docs/P990000305_
 # cancels the extra hour ("decree time") for Atyraū oblast since the
 # last Sunday of March 1999 while retaining the oblast in the fourth
 # time belt.
 #
 # This means change from +05/+06 to +04/+05....
 #
 # 6. Act of the Government of the Republic of Kazakhstan
 # from 2000-11-23 No. 1749
 # http://adilet.zan.kz/rus/archive/docs/P000001749_/23.11.2000
 # replaces the previous five documents.
 #
 # The only changes I noticed are in definition of the border between the
 # fourth and the fifth time belts.  They account for changes in spelling
 # and administrative division (splitting of Turgai oblast in 1997
 # probably changed time in territories incorporated into Qostanay oblast
 # (including Arkalyk) from +06/+07 to +05/+06) and move Qyzylorda oblast
 # from being in the fifth time belt and not using decree time into the
 # fourth time belt (no change in practice).
 #
 # 7. Act of the Government of the Republic of Kazakhstan
 # from 2003-12-29 No. 1342
 # http://adilet.zan.kz/rus/docs/P030001342_
 # modified the 2000-11-23 act.  No relevant changes, apparently.
 #
 # 8. Act of the Government of the Republic of Kazakhstan
 # from 2004-07-20 No. 775
 # http://adilet.zan.kz/rus/archive/docs/P040000775_/20.07.2004
 # modified the 2000-11-23 act to move Qostanay and Qyzylorda oblasts into
 # the fifth time belt and add Aktobe oblast to the list of regions not
 # using extra hour ("decree time"), leaving Kazakhstan with only 2 time
 # zones (+04/+05 and +06/+07).  The changes were to be implemented
 # during DST transitions in 2004 and 2005 but the acts got radically
 # amended before implementation happened.
 #
 # 9. Act of the Government of the Republic of Kazakhstan
 # from 2004-09-15 No. 1059
 # http://adilet.zan.kz/rus/docs/P040001059_
 # modified the 2000-11-23 act to remove exceptions from the "decree time"
 # (leaving Kazakhstan in +05/+06 and +06/+07 zones), amended the
 # 2004-07-20 act to implement changes for Atyraū, West Kazakhstan,
 # Qostanay, Qyzylorda and Mangghystaū oblasts by not moving clocks
 # during the 2004 transition to "winter" time.
 #
 # This means transition from +04/+05 to +05/+06 for Atyraū oblast (no
 # zone currently), Asia/Oral, Asia/Aqtau and transition from +05/+06 to
 # +06/+07 for Qostanay oblast (Qostanay and Arkalyk, no zones currently)
 # and Asia/Qyzylorda on 2004-10-31 at 3:00....
 #
 # 10. Act of the Government of the Republic of Kazakhstan
 # from 2005-03-15 No. 231
 # http://adilet.zan.kz/rus/docs/P050000231_
 # removes DST provisions from the 2000-11-23 act, removes most of the
 # (already implemented) provisions from the 2004-07-20 and 2004-09-15
 # acts, comes into effect 10 days after official publication.
 # The only practical effect seems to be the abolition of the summer
 # time.
 #
 # Unamended version of the act of the Government of the Russian Federation
 # No. 23 from 1992-01-08 [See 'europe' file for details].
 # Kazakh 1992-01-13 act appears to provide the same rules and 1992-03-27
 # act was to be enacted on the last Sunday of March 1992.
 
 # From Stepan Golosunov (2016-11-08):
 # Turgai reorganization should affect only southern part of Qostanay
 # oblast.  Which should probably be separated into Asia/Arkalyk zone.
 # (There were also 1970, 1988 and 1990 Turgai oblast reorganizations
 # according to wikipedia.)
 #
 # [For Qostanay] http://www.ng.kz/gazeta/195/hranit/
 # suggests that clocks were to be moved 40 minutes backwards on
 # 1920-01-01 to the fourth time belt.  But I do not understand
 # how that could happen....
 #
 # [For Atyrau and Oral] 1919 decree
 # (http://www.worldtimezone.com/dst_news/dst_news_russia-1919-02-08.html
 # and in Byalokoz) lists Ural river (plus 10 versts on its left bank) in
 # the third time belt (before 1930 this means +03).
 
 # From Alexander Konzurovski (2018-12-20):
 # (Asia/Qyzylorda) is changing its time zone from UTC+6 to UTC+5
 # effective December 21st, 2018....
 # http://adilet.zan.kz/rus/docs/P1800000817 (russian language).
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 #
 # Almaty (formerly Alma-Ata), representing most locations in Kazakhstan
 # This includes KZ-AKM, KZ-ALA, KZ-ALM, KZ-AST, KZ-BAY, KZ-VOS, KZ-ZHA,
 # KZ-KAR, KZ-SEV, KZ-PAV, and KZ-YUZ.
 Zone	Asia/Almaty	5:07:48 -	LMT	1924 May  2 # or Alma-Ata
 			5:00	-	+05	1930 Jun 21
 			6:00 RussiaAsia +06/+07	1991 Mar 31  2:00s
 			5:00 RussiaAsia	+05/+06	1992 Jan 19  2:00s
 			6:00 RussiaAsia	+06/+07	2004 Oct 31  2:00s
 			6:00	-	+06
 # Qyzylorda (aka Kyzylorda, Kizilorda, Kzyl-Orda, etc.) (KZ-KZY)
 Zone	Asia/Qyzylorda	4:21:52 -	LMT	1924 May  2
 			4:00	-	+04	1930 Jun 21
 			5:00	-	+05	1981 Apr  1
 			5:00	1:00	+06	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
 			4:00 RussiaAsia	+04/+05	1991 Sep 29  2:00s
 			5:00 RussiaAsia	+05/+06	1992 Jan 19  2:00s
 			6:00 RussiaAsia	+06/+07	1992 Mar 29  2:00s
 			5:00 RussiaAsia	+05/+06	2004 Oct 31  2:00s
 			6:00	-	+06	2018 Dec 21  0:00
 			5:00	-	+05
 #
 # Qostanay (aka Kostanay, Kustanay) (KZ-KUS)
 # The 1991/2 rules are unclear partly because of the 1997 Turgai
 # reorganization.
 Zone	Asia/Qostanay	4:14:28 -	LMT	1924 May  2
 			4:00	-	+04	1930 Jun 21
 			5:00	-	+05	1981 Apr  1
 			5:00	1:00	+06	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
 			5:00 RussiaAsia	+05/+06	2004 Oct 31  2:00s
 			6:00	-	+06
 
 # Aqtöbe (aka Aktobe, formerly Aktyubinsk) (KZ-AKT)
 Zone	Asia/Aqtobe	3:48:40	-	LMT	1924 May  2
 			4:00	-	+04	1930 Jun 21
 			5:00	-	+05	1981 Apr  1
 			5:00	1:00	+06	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
 			5:00 RussiaAsia	+05/+06	2004 Oct 31  2:00s
 			5:00	-	+05
 # Mangghystaū (KZ-MAN)
 # Aqtau was not founded until 1963, but it represents an inhabited region,
 # so include timestamps before 1963.
 Zone	Asia/Aqtau	3:21:04	-	LMT	1924 May  2
 			4:00	-	+04	1930 Jun 21
 			5:00	-	+05	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
 			5:00 RussiaAsia	+05/+06	1994 Sep 25  2:00s
 			4:00 RussiaAsia	+04/+05	2004 Oct 31  2:00s
 			5:00	-	+05
 # Atyraū (KZ-ATY) is like Mangghystaū except it switched from
 # +04/+05 to +05/+06 in spring 1999, not fall 1994.
 Zone	Asia/Atyrau	3:27:44	-	LMT	1924 May  2
 			3:00	-	+03	1930 Jun 21
 			5:00	-	+05	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
 			5:00 RussiaAsia	+05/+06	1999 Mar 28  2:00s
 			4:00 RussiaAsia	+04/+05	2004 Oct 31  2:00s
 			5:00	-	+05
 # West Kazakhstan (KZ-ZAP)
 # From Paul Eggert (2016-03-18):
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 Zone	Asia/Oral	3:25:24	-	LMT	1924 May  2 # or Ural'sk
 			3:00	-	+03	1930 Jun 21
 			5:00	-	+05	1981 Apr  1
 			5:00	1:00	+06	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1989 Mar 26  2:00s
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
 			5:00 RussiaAsia	+05/+06	1992 Mar 29  2:00s
 			4:00 RussiaAsia	+04/+05	2004 Oct 31  2:00s
 			5:00	-	+05
 
 # Kyrgyzstan (Kirgizstan)
 # Transitions through 1991 are from Shanks & Pottenger.
 
 # From Paul Eggert (2005-08-15):
 # According to an article dated today in the Kyrgyzstan Development Gateway
 # http://eng.gateway.kg/cgi-bin/page.pl?id=1&story_name=doc9979.shtml
 # Kyrgyzstan is canceling the daylight saving time system.  I take the article
 # to mean that they will leave their clocks at 6 hours ahead of UTC.
 # From Malik Abdugaliev (2005-09-21):
 # Our government cancels daylight saving time 6th of August 2005.
 # From 2005-08-12 our GMT-offset is +6, w/o any daylight saving.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Kyrgyz	1992	1996	-	Apr	Sun>=7	0:00s	1:00	-
 Rule	Kyrgyz	1992	1996	-	Sep	lastSun	0:00	0	-
 Rule	Kyrgyz	1997	2005	-	Mar	lastSun	2:30	1:00	-
 Rule	Kyrgyz	1997	2004	-	Oct	lastSun	2:30	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Bishkek	4:58:24 -	LMT	1924 May  2
 			5:00	-	+05	1930 Jun 21
 			6:00 RussiaAsia +06/+07	1991 Mar 31  2:00s
 			5:00 RussiaAsia	+05/+06	1991 Aug 31  2:00
 			5:00	Kyrgyz	+05/+06	2005 Aug 12
 			6:00	-	+06
 
 ###############################################################################
 
 # Korea (North and South)
 
 # From Annie I. Bang (2006-07-10):
 # http://www.koreaherald.com/view.php?ud=200607100012
 # Korea ran a daylight saving program from 1949-61 but stopped it
 # during the 1950-53 Korean War.  The system was temporarily enforced
 # between 1987 and 1988 ...
 
 # From Sanghyuk Jung (2014-10-29):
 # https://mm.icann.org/pipermail/tz/2014-October/021830.html
 # According to the Korean Wikipedia
 # https://ko.wikipedia.org/wiki/한국_표준시
 # [oldid=12896437 2014-09-04 08:03 UTC]
 # DST in Republic of Korea was as follows....  And I checked old
 # newspapers in Korean, all articles correspond with data in Wikipedia.
 # For example, the article in 1948 (Korean Language) proved that DST
 # started at June 1 in that year.  For another example, the article in
 # 1988 said that DST started at 2:00 AM in that year.
 
 # From Phake Nick (2018-10-27):
 # 1. According to official announcement from Korean government, the DST end
 # date in South Korea should be
 # 1955-09-08 without specifying time
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027977557
 # 1956-09-29 without specifying time
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027978341
 # 1957-09-21 24 o'clock
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027979690#3
 # 1958-09-20 24 o'clock
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027981189
 # 1959-09-19 24 o'clock
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0027982974#2
 # 1960-09-17 24 o'clock
 # http://theme.archives.go.kr/next/common/viewEbook.do?singleData=N&archiveEventId=0028044104
 # ...
 # 2.... https://namu.wiki/w/대한민국%20표준시 ... [says]
 # when Korea was using GMT+8:30 as standard time, the international
 # aviation/marine/meteorological industry in the country refused to
 # follow and continued to use GMT+9:00 for interoperability.
 
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	ROK	1948	only	-	Jun	 1	 0:00	1:00	D
 Rule	ROK	1948	only	-	Sep	12	24:00	0	S
 Rule	ROK	1949	only	-	Apr	 3	 0:00	1:00	D
 Rule	ROK	1949	1951	-	Sep	Sat>=7	24:00	0	S
 Rule	ROK	1950	only	-	Apr	 1	 0:00	1:00	D
 Rule	ROK	1951	only	-	May	 6	 0:00	1:00	D
 Rule	ROK	1955	only	-	May	 5	 0:00	1:00	D
 Rule	ROK	1955	only	-	Sep	 8	24:00	0	S
 Rule	ROK	1956	only	-	May	20	 0:00	1:00	D
 Rule	ROK	1956	only	-	Sep	29	24:00	0	S
 Rule	ROK	1957	1960	-	May	Sun>=1	 0:00	1:00	D
 Rule	ROK	1957	1960	-	Sep	Sat>=17	24:00	0	S
 Rule	ROK	1987	1988	-	May	Sun>=8	 2:00	1:00	D
 Rule	ROK	1987	1988	-	Oct	Sun>=8	 3:00	0	S
 
 # From Paul Eggert (2016-08-23):
 # The Korean Wikipedia entry gives the following sources for UT offsets:
 #
 # 1908: Official Journal Article No. 3994 (decree No. 5)
 # 1912: Governor-General of Korea Official Gazette Issue No. 367
 #       (Announcement No. 338)
 # 1954: Presidential Decree No. 876 (1954-03-17)
 # 1961: Law No. 676 (1961-08-07)
 #
 # (Another source "1987: Law No. 3919 (1986-12-31)" was in the 2014-10-30
 # edition of the Korean Wikipedia entry.)
 #
 # I guessed that time zone abbreviations through 1945 followed the same
 # rules as discussed under Taiwan, with nominal switches from JST to KST
 # when the respective cities were taken over by the Allies after WWII.
 #
 # For Pyongyang, guess no changes from World War II until 2015, as we
 # have no information otherwise.
 
 # From Steffen Thorsen (2015-08-07):
 # According to many news sources, North Korea is going to change to
 # the 8:30 time zone on August 15, one example:
 # http://www.bbc.com/news/world-asia-33815049
 #
 # From Paul Eggert (2015-08-15):
 # Bells rang out midnight (00:00) Friday as part of the celebrations.  See:
 # Talmadge E. North Korea celebrates new time zone, 'Pyongyang Time'
 # http://news.yahoo.com/north-korea-celebrates-time-zone-pyongyang-time-164038128.html
 # There is no common English-language abbreviation for this time zone.
 # Use KST, as that's what we already use for 1954-1961 in ROK.
 
 # From Kang Seonghoon (2018-04-29):
 # North Korea will revert its time zone from UTC+8:30 (PYT; Pyongyang
 # Time) back to UTC+9 (KST; Korea Standard Time).
 #
 # From Seo Sanghyeon (2018-04-30):
 # Rodong Sinmun 2018-04-30 announced Pyongyang Time transition plan.
 # https://www.nknews.org/kcna/wp-content/uploads/sites/5/2018/04/rodong-2018-04-30.pdf
 # ... the transition date is 2018-05-05 ...  Citation should be Decree
 # No. 2232 of April 30, 2018, of the Presidium of the Supreme People's
 # Assembly, as published in Rodong Sinmun.
 # From Tim Parenti (2018-04-29):
 # It appears to be the front page story at the top in the right-most column.
 #
 # From Paul Eggert (2018-05-04):
 # The BBC reported that the transition was from 23:30 to 24:00 today.
 # https://www.bbc.com/news/world-asia-44010705
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Seoul	8:27:52	-	LMT	1908 Apr  1
 			8:30	-	KST	1912 Jan  1
 			9:00	-	JST	1945 Sep  8
 			9:00	ROK	K%sT	1954 Mar 21
 			8:30	ROK	K%sT	1961 Aug 10
 			9:00	ROK	K%sT
 Zone	Asia/Pyongyang	8:23:00 -	LMT	1908 Apr  1
 			8:30	-	KST	1912 Jan  1
 			9:00	-	JST	1945 Aug 24
 			9:00	-	KST	2015 Aug 15 00:00
 			8:30	-	KST	2018 May  4 23:30
 			9:00	-	KST
 
 
 # Lebanon
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Lebanon	1920	only	-	Mar	28	0:00	1:00	S
 Rule	Lebanon	1920	only	-	Oct	25	0:00	0	-
 Rule	Lebanon	1921	only	-	Apr	3	0:00	1:00	S
 Rule	Lebanon	1921	only	-	Oct	3	0:00	0	-
 Rule	Lebanon	1922	only	-	Mar	26	0:00	1:00	S
 Rule	Lebanon	1922	only	-	Oct	8	0:00	0	-
 Rule	Lebanon	1923	only	-	Apr	22	0:00	1:00	S
 Rule	Lebanon	1923	only	-	Sep	16	0:00	0	-
 Rule	Lebanon	1957	1961	-	May	1	0:00	1:00	S
 Rule	Lebanon	1957	1961	-	Oct	1	0:00	0	-
 Rule	Lebanon	1972	only	-	Jun	22	0:00	1:00	S
 Rule	Lebanon	1972	1977	-	Oct	1	0:00	0	-
 Rule	Lebanon	1973	1977	-	May	1	0:00	1:00	S
 Rule	Lebanon	1978	only	-	Apr	30	0:00	1:00	S
 Rule	Lebanon	1978	only	-	Sep	30	0:00	0	-
 Rule	Lebanon	1984	1987	-	May	1	0:00	1:00	S
 Rule	Lebanon	1984	1991	-	Oct	16	0:00	0	-
 Rule	Lebanon	1988	only	-	Jun	1	0:00	1:00	S
 Rule	Lebanon	1989	only	-	May	10	0:00	1:00	S
 Rule	Lebanon	1990	1992	-	May	1	0:00	1:00	S
 Rule	Lebanon	1992	only	-	Oct	4	0:00	0	-
 Rule	Lebanon	1993	max	-	Mar	lastSun	0:00	1:00	S
 Rule	Lebanon	1993	1998	-	Sep	lastSun	0:00	0	-
 Rule	Lebanon	1999	max	-	Oct	lastSun	0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Beirut	2:22:00 -	LMT	1880
 			2:00	Lebanon	EE%sT
 
 # Brunei
 # Malaysia (eastern)
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	NBorneo	1935	1941	-	Sep	14	0:00	0:20	-
 Rule	NBorneo	1935	1941	-	Dec	14	0:00	0	-
 #
 # For peninsular Malaysia see Asia/Singapore.
 #
 # Sabah & Sarawak
 # From Paul Eggert (2014-08-12):
 # The data entries here are mostly from Shanks & Pottenger, but the 1942, 1945
 # and 1982 transition dates are from Mok Ly Yng.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Asia/Kuching	7:21:20	-	LMT	1926 Mar
 			7:30	-	+0730	1933
 			8:00 NBorneo  +08/+0820	1942 Feb 16
 			9:00	-	+09	1945 Sep 12
 			8:00	-	+08
 
 # Maldives
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Indian/Maldives	4:54:00 -	LMT	1880 # Malé
 			4:54:00	-	MMT	1960 # Malé Mean Time
 			5:00	-	+05
 
 # Mongolia
 
 # Shanks & Pottenger say that Mongolia has three time zones, but
 # The USNO (1995-12-21) and the CIA map Standard Time Zones of the World
 # (2005-03) both say that it has just one.
 
 # From Oscar van Vlijmen (1999-12-11):
 # General Information Mongolia
 #  (1999-09)
 # "Time: Mongolia has two time zones. Three westernmost provinces of
 # Bayan-Ölgii, Uvs, and Hovd are one hour earlier than the capital city, and
 # the rest of the country follows the Ulaanbaatar time, which is UTC/GMT plus
 # eight hours."
 
 # From Rives McDow (1999-12-13):
 # Mongolia discontinued the use of daylight savings time in 1999; 1998
 # being the last year it was implemented.  The dates of implementation I am
 # unsure of, but most probably it was similar to Russia, except for the time
 # of implementation may have been different....
 # Some maps in the past have indicated that there was an additional time
 # zone in the eastern part of Mongolia, including the provinces of Dornod,
 # Sükhbaatar, and possibly Khentii.
 
 # From Paul Eggert (1999-12-15):
 # Naming and spelling is tricky in Mongolia.
 # We'll use Hovd (also spelled Chovd and Khovd) to represent the west zone;
 # the capital of the Hovd province is sometimes called Hovd, sometimes Dund-Us,
 # and sometimes Jirgalanta (with variant spellings), but the name Hovd
 # is good enough for our purposes.
 
 # From Rives McDow (2001-05-13):
 # In addition to Mongolia starting daylight savings as reported earlier
 # (adopted DST on 2001-04-27 02:00 local time, ending 2001-09-28),
 # there are three time zones.
 #
 # Provinces [at 7:00]: Bayan-Ölgii, Uvs, Khovd, Zavkhan, Govi-Altai
 # Provinces [at 8:00]: Khövsgöl, Bulgan, Arkhangai, Khentii, Töv,
 #	Bayankhongor, Övörkhangai, Dundgovi, Dornogovi, Ömnögovi
 # Provinces [at 9:00]: Dornod, Sükhbaatar
 #
 # [The province of Selenge is omitted from the above lists.]
 
 # From Ganbold Ts., Ulaanbaatar (2004-04-17):
 # Daylight saving occurs at 02:00 local time last Saturday of March.
 # It will change back to normal at 02:00 local time last Saturday of
 # September.... As I remember this rule was changed in 2001.
 #
 # From Paul Eggert (2004-04-17):
 # For now, assume Rives McDow's informant got confused about Friday vs
 # Saturday, and that his 2001 dates should have 1 added to them.
 
 # From Paul Eggert (2005-07-26):
 # We have wildly conflicting information about Mongolia's time zones.
 # Bill Bonnet (2005-05-19) reports that the US Embassy in Ulaanbaatar says
 # there is only one time zone and that DST is observed, citing Microsoft
 # Windows XP as the source.  Risto Nykänen (2005-05-16) reports that
 # travelmongolia.org says there are two time zones (UT +07, +08) with no DST.
 # Oscar van Vlijmen (2005-05-20) reports that the Mongolian Embassy in
 # Washington, DC says there are two time zones, with DST observed.
 # He also found
 # http://ubpost.mongolnews.mn/index.php?subaction=showcomments&id=1111634894&archive=&start_from=&ucat=1&
 # which also says that there is DST, and which has a comment by "Toddius"
 # (2005-03-31 06:05 +0700) saying "Mongolia actually has 3.5 time zones.
 # The West (OLGII) is +7 GMT, most of the country is ULAT is +8 GMT
 # and some Eastern provinces are +9 GMT but Sükhbaatar Aimag is SUHK +8.5 GMT.
 # The SUKH timezone is new this year, it is one of the few things the
 # parliament passed during the tumultuous winter session."
 # For now, let's ignore this information, until we have more confirmation.
 
 # From Ganbold Ts. (2007-02-26):
 # Parliament of Mongolia has just changed the daylight-saving rule in February.
 # They decided not to adopt daylight-saving time....
 # http://www.mongolnews.mn/index.php?module=unuudur&sec=view&id=15742
 
 # From Deborah Goldsmith (2008-03-30):
 # We received a bug report claiming that the tz database UTC offset for
 # Asia/Choibalsan (GMT+09:00) is incorrect, and that it should be GMT
 # +08:00 instead. Different sources appear to disagree with the tz
 # database on this, e.g.:
 #
 # https://www.timeanddate.com/worldclock/city.html?n=1026
 # http://www.worldtimeserver.com/current_time_in_MN.aspx
 #
 # both say GMT+08:00.
 
 # From Steffen Thorsen (2008-03-31):
 # eznis airways, which operates several domestic flights, has a flight
 # schedule here:
 # http://www.eznis.com/Container.jsp?id=112
 # (click the English flag for English)
 #
 # There it appears that flights between Choibalsan and Ulaanbaatar arrive
 # about 1:35 - 1:50 hours later in local clock time, no matter the
 # direction, while Ulaanbaatar-Khovd takes 2 hours in the Eastern
 # direction and 3:35 back, which indicates that Ulaanbaatar and Khovd are
 # in different time zones (like we know about), while Choibalsan and
 # Ulaanbaatar are in the same time zone (correction needed).
 
 # From Arthur David Olson (2008-05-19):
 # Assume that Choibalsan is indeed offset by 8:00.
 # XXX--in the absence of better information, assume that transition
 # was at the start of 2008-03-31 (the day of Steffen Thorsen's report);
 # this is almost surely wrong.
 
 # From Ganbold Tsagaankhuu (2015-03-10):
 # It seems like yesterday Mongolian Government meeting has concluded to use
 # daylight saving time in Mongolia....  Starting at 2:00AM of last Saturday of
 # March 2015, daylight saving time starts.  And 00:00AM of last Saturday of
 # September daylight saving time ends.  Source:
 # http://zasag.mn/news/view/8969
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Mongol	1983	1984	-	Apr	1	0:00	1:00	-
 Rule	Mongol	1983	only	-	Oct	1	0:00	0	-
 # Shanks & Pottenger and IATA SSIM say 1990s switches occurred at 00:00,
 # but McDow says the 2001 switches occurred at 02:00.  Also, IATA SSIM
 # (1996-09) says 1996-10-25.  Go with Shanks & Pottenger through 1998.
 #
 # Shanks & Pottenger say that the Sept. 1984 through Sept. 1990 switches
 # in Choibalsan (more precisely, in Dornod and Sükhbaatar) took place
 # at 02:00 standard time, not at 00:00 local time as in the rest of
 # the country.  That would be odd, and possibly is a result of their
 # correction of 02:00 (in the previous edition) not being done correctly
 # in the latest edition; so ignore it for now.
 
 # From Ganbold Tsagaankhuu (2017-02-09):
 # Mongolian Government meeting has concluded today to cancel daylight
 # saving time adoption in Mongolia.  Source: http://zasag.mn/news/view/16192
 
 Rule	Mongol	1985	1998	-	Mar	lastSun	0:00	1:00	-
 Rule	Mongol	1984	1998	-	Sep	lastSun	0:00	0	-
 # IATA SSIM (1999-09) says Mongolia no longer observes DST.
 Rule	Mongol	2001	only	-	Apr	lastSat	2:00	1:00	-
 Rule	Mongol	2001	2006	-	Sep	lastSat	2:00	0	-
 Rule	Mongol	2002	2006	-	Mar	lastSat	2:00	1:00	-
 Rule	Mongol	2015	2016	-	Mar	lastSat	2:00	1:00	-
 Rule	Mongol	2015	2016	-	Sep	lastSat	0:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta
 Zone	Asia/Hovd	6:06:36 -	LMT	1905 Aug
 			6:00	-	+06	1978
 			7:00	Mongol	+07/+08
 # Ulaanbaatar, a.k.a. Ulan Bataar, Ulan Bator, Urga
 Zone	Asia/Ulaanbaatar 7:07:32 -	LMT	1905 Aug
 			7:00	-	+07	1978
 			8:00	Mongol	+08/+09
 # Choibalsan, a.k.a. Bajan Tümen, Bajan Tumen, Chojbalsan,
 # Choybalsan, Sanbejse, Tchoibalsan
 Zone	Asia/Choibalsan	7:38:00 -	LMT	1905 Aug
 			7:00	-	+07	1978
 			8:00	-	+08	1983 Apr
 			9:00	Mongol	+09/+10	2008 Mar 31
 			8:00	Mongol	+08/+09
 
 # Nepal
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Kathmandu	5:41:16 -	LMT	1920
 			5:30	-	+0530	1986
 			5:45	-	+0545
 
 # Pakistan
 
 # From Rives McDow (2002-03-13):
 # I have been advised that Pakistan has decided to adopt dst on a
 # TRIAL basis for one year, starting 00:01 local time on April 7, 2002
 # and ending at 00:01 local time October 6, 2002.  This is what I was
 # told, but I believe that the actual time of change may be 00:00; the
 # 00:01 was to make it clear which day it was on.
 
 # From Paul Eggert (2002-03-15):
 # Jesper Nørgaard found this URL:
 # http://www.pak.gov.pk/public/news/app/app06_dec.htm
 # (dated 2001-12-06) which says that the Cabinet adopted a scheme "to
 # advance the clocks by one hour on the night between the first
 # Saturday and Sunday of April and revert to the original position on
 # 15th October each year".  This agrees with McDow's 04-07 at 00:00,
 # but disagrees about the October transition, and makes it sound like
 # it's not on a trial basis.  Also, the "between the first Saturday
 # and Sunday of April" phrase, if taken literally, means that the
 # transition takes place at 00:00 on the first Sunday on or after 04-02.
 
 # From Paul Eggert (2003-02-09):
 # DAWN  reported on 2002-10-05
 # that 2002 DST ended that day at midnight.  Go with McDow for now.
 
 # From Steffen Thorsen (2003-03-14):
 # According to http://www.dawn.com/2003/03/07/top15.htm
 # there will be no DST in Pakistan this year:
 #
 # ISLAMABAD, March 6: Information and Media Development Minister Sheikh
 # Rashid Ahmed on Thursday said the cabinet had reversed a previous
 # decision to advance clocks by one hour in summer and put them back by
 # one hour in winter with the aim of saving light hours and energy.
 #
 # The minister told a news conference that the experiment had rather
 # shown 8 per cent higher consumption of electricity.
 
 # From Alex Krivenyshev (2008-05-15):
 #
 # Here is an article that Pakistan plan to introduce Daylight Saving Time
 # on June 1, 2008 for 3 months.
 #
 # "... The federal cabinet on Wednesday announced a new conservation plan to
 # help reduce load shedding by approving the closure of commercial centres at
 # 9pm and moving clocks forward by one hour for the next three months. ...."
 #
 # http://www.worldtimezone.com/dst_news/dst_news_pakistan01.html
 # http://www.dailytimes.com.pk/default.asp?page=2008%5C05%5C15%5Cstory_15-5-2008_pg1_4
 
 # From Arthur David Olson (2008-05-19):
 # XXX--midnight transitions is a guess; 2008 only is a guess.
 
 # From Alexander Krivenyshev (2008-08-28):
 # Pakistan government has decided to keep the watches one-hour advanced
 # for another 2 months - plan to return to Standard Time on October 31
 # instead of August 31.
 #
 # http://www.worldtimezone.com/dst_news/dst_news_pakistan02.html
 # http://dailymailnews.com/200808/28/news/dmbrn03.html
 
 # From Alexander Krivenyshev (2009-04-08):
 # Based on previous media reports that "... proposed plan to
 # advance clocks by one hour from May 1 will cause disturbance
 # to the working schedules rather than bringing discipline in
 # official working."
 # http://www.thenews.com.pk/daily_detail.asp?id=171280
 #
 # recent news that instead of May 2009 - Pakistan plan to
 # introduce DST from April 15, 2009
 #
 # FYI: Associated Press Of Pakistan
 # April 08, 2009
 # Cabinet okays proposal to advance clocks by one hour from April 15
 # http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=73043&Itemid=1
 # http://www.worldtimezone.com/dst_news/dst_news_pakistan05.html
 #
 # ....
 # The Federal Cabinet on Wednesday approved the proposal to
 # advance clocks in the country by one hour from April 15 to
 # conserve energy"
 
 # From Steffen Thorsen (2009-09-17):
 # "The News International," Pakistan reports that: "The Federal
 # Government has decided to restore the previous time by moving the
 # clocks backward by one hour from October 1. A formal announcement to
 # this effect will be made after the Prime Minister grants approval in
 # this regard."
 # http://www.thenews.com.pk/updates.asp?id=87168
 
 # From Alexander Krivenyshev (2009-09-28):
 # According to Associated Press Of Pakistan, it is confirmed that
 # Pakistan clocks across the country would be turned back by an hour from
 # October 1, 2009.
 #
 # "Clocks to go back one hour from 1 Oct"
 # http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=86715&Itemid=2
 # http://www.worldtimezone.com/dst_news/dst_news_pakistan07.htm
 #
 # From Steffen Thorsen (2009-09-29):
 # Now they seem to have changed their mind, November 1 is the new date:
 # http://www.thenews.com.pk/top_story_detail.asp?Id=24742
 # "The country's clocks will be reversed by one hour on November 1.
 # Officials of Federal Ministry for Interior told this to Geo News on
 # Monday."
 #
 # And more importantly, it seems that these dates will be kept every year:
 # "It has now been decided that clocks will be wound forward by one hour
 # on April 15 and reversed by an hour on November 1 every year without
 # obtaining prior approval, the officials added."
 #
 # We have confirmed this year's end date with both with the Ministry of
 # Water and Power and the Pakistan Electric Power Company:
 # https://www.timeanddate.com/news/time/pakistan-ends-dst09.html
 
 # From Christoph Göhre (2009-10-01):
 # [T]he German Consulate General in Karachi reported me today that Pakistan
 # will go back to standard time on 1st of November.
 
 # From Steffen Thorsen (2010-03-26):
 # Steffen Thorsen wrote:
 # > On Thursday (2010-03-25) it was announced that DST would start in
 # > Pakistan on 2010-04-01.
 # >
 # > Then today, the president said that they might have to revert the
 # > decision if it is not supported by the parliament. So at the time
 # > being, it seems unclear if DST will be actually observed or not - but
 # > April 1 could be a more likely date than April 15.
 # Now, it seems that the decision to not observe DST in final:
 #
 # "Govt Withdraws Plan To Advance Clocks"
 # http://www.apakistannews.com/govt-withdraws-plan-to-advance-clocks-172041
 #
 # "People laud PM's announcement to end DST"
 # http://www.app.com.pk/en_/index.php?option=com_content&task=view&id=99374&Itemid=2
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule Pakistan	2002	only	-	Apr	Sun>=2	0:00	1:00	S
 Rule Pakistan	2002	only	-	Oct	Sun>=2	0:00	0	-
 Rule Pakistan	2008	only	-	Jun	1	0:00	1:00	S
 Rule Pakistan	2008	2009	-	Nov	1	0:00	0	-
 Rule Pakistan	2009	only	-	Apr	15	0:00	1:00	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Karachi	4:28:12 -	LMT	1907
 			5:30	-	+0530	1942 Sep
 			5:30	1:00	+0630	1945 Oct 15
 			5:30	-	+0530	1951 Sep 30
 			5:00	-	+05	1971 Mar 26
 			5:00 Pakistan	PK%sT	# Pakistan Time
 
 # Palestine
 
 # From Amos Shapir (1998-02-15):
 #
 # From 1917 until 1948-05-15, all of Palestine, including the parts now
 # known as the Gaza Strip and the West Bank, was under British rule.
 # Therefore the rules given for Israel for that period, apply there too...
 #
 # The Gaza Strip was under Egyptian rule between 1948-05-15 until 1967-06-05
 # (except a short occupation by Israel from 1956-11 till 1957-03, but no
 # time zone was affected then).  It was never formally annexed to Egypt,
 # though.
 #
 # The rest of Palestine was under Jordanian rule at that time, formally
 # annexed in 1950 as the West Bank (and the word "Trans" was dropped from
 # the country's previous name of "the Hashemite Kingdom of the
 # Trans-Jordan").  So the rules for Jordan for that time apply.  Major
 # towns in that area are Nablus (Shchem), El-Halil (Hebron), Ramallah, and
 # East Jerusalem.
 #
 # Both areas were occupied by Israel in June 1967, but not annexed (except
 # for East Jerusalem).  They were on Israel time since then; there might
 # have been a Military Governor's order about time zones, but I'm not aware
 # of any (such orders may have been issued semi-annually whenever summer
 # time was in effect, but maybe the legal aspect of time was just neglected).
 #
 # The Palestinian Authority was established in 1993, and got hold of most
 # towns in the West Bank and Gaza by 1995.  I know that in order to
 # demonstrate...independence, they have been switching to
 # summer time and back on a different schedule than Israel's, but I don't
 # know when this was started, or what algorithm is used (most likely the
 # Jordanian one).
 #
 # To summarize, the table should probably look something like that:
 #
 # Area \ when | 1918-1947 | 1948-1967 | 1967-1995 | 1996-
 # ------------+-----------+-----------+-----------+-----------
 # Israel      | Zion      | Zion      | Zion      | Zion
 # West bank   | Zion      | Jordan    | Zion      | Jordan
 # Gaza        | Zion      | Egypt     | Zion      | Jordan
 #
 # I guess more info may be available from the PA's web page (if/when they
 # have one).
 
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger write that Gaza did not observe DST until 1957, but go
 # with Shapir and assume that it observed DST from 1940 through 1947,
 # and that it used Jordanian rules starting in 1996.
 # We don't yet need a separate entry for the West Bank, since
 # the only differences between it and Gaza that we know about
 # occurred before our cutoff date of 1970.
 # However, as we get more information, we may need to add entries
 # for parts of the West Bank as they transitioned from Israel's rules
 # to Palestine's rules.
 
 # From IINS News Service - Israel - 1998-03-23 10:38:07 Israel time,
 # forwarded by Ephraim Silverberg:
 #
 # Despite the fact that Israel changed over to daylight savings time
 # last week, the PLO Authority (PA) has decided not to turn its clocks
 # one-hour forward at this time.  As a sign of independence from Israeli rule,
 # the PA has decided to implement DST in April.
 
 # From Paul Eggert (1999-09-20):
 # Daoud Kuttab writes in Holiday havoc
 # http://www.jpost.com/com/Archive/22.Apr.1999/Opinion/Article-2.html
 # (Jerusalem Post, 1999-04-22) that
 # the Palestinian National Authority changed to DST on 1999-04-15.
 # I vaguely recall that they switch back in October (sorry, forgot the source).
 # For now, let's assume that the spring switch was at 24:00,
 # and that they switch at 0:00 on the 3rd Fridays of April and October.
 
 # From Paul Eggert (2005-11-22):
 # Starting 2004 transitions are from Steffen Thorsen's web site timeanddate.com.
 
 # From Steffen Thorsen (2005-11-23):
 # A user from Gaza reported that Gaza made the change early because of
 # the Ramadan.  Next year Ramadan will be even earlier, so I think
 # there is a good chance next year's end date will be around two weeks
 # earlier - the same goes for Jordan.
 
 # From Steffen Thorsen (2006-08-17):
 # I was informed by a user in Bethlehem that in Bethlehem it started the
 # same day as Israel, and after checking with other users in the area, I
 # was informed that they started DST one day after Israel.  I was not
 # able to find any authoritative sources at the time, nor details if
 # Gaza changed as well, but presumed Gaza to follow the same rules as
 # the West Bank.
 
 # From Steffen Thorsen (2006-09-26):
 # according to the Palestine News Network (2006-09-19):
 # http://english.pnn.ps/index.php?option=com_content&task=view&id=596&Itemid=5
 # > The Council of Ministers announced that this year its winter schedule
 # > will begin early, as of midnight Thursday.  It is also time to turn
 # > back the clocks for winter.  Friday will begin an hour late this week.
 # I guess it is likely that next year's date will be moved as well,
 # because of the Ramadan.
 
 # From Jesper Nørgaard Welen (2007-09-18):
 # According to Steffen Thorsen's web site the Gaza Strip and the rest of the
 # Palestinian territories left DST early on 13.th. of September at 2:00.
 
 # From Paul Eggert (2007-09-20):
 # My understanding is that Gaza and the West Bank disagree even over when
 # the weekend is (Thursday+Friday versus Friday+Saturday), so I'd be a bit
 # surprised if they agreed about DST.  But for now, assume they agree.
 # For lack of better information, predict that future changes will be
 # the 2nd Thursday of September at 02:00.
 
 # From Alexander Krivenyshev (2008-08-28):
 # Here is an article, that Mideast running on different clocks at Ramadan.
 #
 # Gaza Strip (as Egypt) ended DST at midnight Thursday (Aug 28, 2008), while
 # the West Bank will end Daylight Saving Time at midnight Sunday (Aug 31, 2008).
 #
 # http://www.guardian.co.uk/world/feedarticle/7759001
 # http://www.abcnews.go.com/International/wireStory?id=5676087
 # http://www.worldtimezone.com/dst_news/dst_news_gazastrip01.html
 
 # From Alexander Krivenyshev (2009-03-26):
 # According to the Palestine News Network (arabic.pnn.ps), Palestinian
 # government decided to start Daylight Time on Thursday night March
 # 26 and continue until the night of 27 September 2009.
 #
 # (in Arabic)
 # http://arabic.pnn.ps/index.php?option=com_content&task=view&id=50850
 #
 # (English translation)
 # http://www.worldtimezone.com/dst_news/dst_news_westbank01.html
 
 # From Steffen Thorsen (2009-08-31):
 # Palestine's Council of Ministers announced that they will revert back to
 # winter time on Friday, 2009-09-04.
 #
 # One news source:
 # http://www.safa.ps/ara/?action=showdetail&seid=4158
 # (Palestinian press agency, Arabic),
 # Google translate: "Decided that the Palestinian government in Ramallah
 # headed by Salam Fayyad, the start of work in time for the winter of
 # 2009, starting on Friday approved the fourth delay Sept. clock sixty
 # minutes per hour as of Friday morning."
 #
 # We are not sure if Gaza will do the same, last year they had a different
 # end date, we will keep this page updated:
 # https://www.timeanddate.com/news/time/westbank-gaza-dst-2009.html
 
 # From Alexander Krivenyshev (2009-09-02):
 # Seems that Gaza Strip will go back to Winter Time same date as West Bank.
 #
 # According to Palestinian Ministry Of Interior, West Bank and Gaza Strip plan
 # to change time back to Standard time on September 4, 2009.
 #
 # "Winter time unite the West Bank and Gaza"
 # (from Palestinian National Authority):
 # http://www.moi.gov.ps/en/?page=633167343250594025&nid=11505
 # http://www.worldtimezone.com/dst_news/dst_news_gazastrip02.html
 
 # From Alexander Krivenyshev (2010-03-19):
 # According to Voice of Palestine DST will last for 191 days, from March
 # 26, 2010 till "the last Sunday before the tenth day of Tishri
 # (October), each year" (October 03, 2010?)
 #
 # http://palvoice.org/forums/showthread.php?t=245697
 # (in Arabic)
 # http://www.worldtimezone.com/dst_news/dst_news_westbank03.html
 
 # From Steffen Thorsen (2010-03-24):
 # ...Ma'an News Agency reports that Hamas cabinet has decided it will
 # start one day later, at 12:01am. Not sure if they really mean 12:01am or
 # noon though:
 #
 # http://www.maannews.net/eng/ViewDetails.aspx?ID=271178
 # (Ma'an News Agency)
 # "At 12:01am Friday, clocks in Israel and the West Bank will change to
 # 1:01am, while Gaza clocks will change at 12:01am Saturday morning."
 
 # From Steffen Thorsen (2010-08-11):
 # According to several sources, including
 # http://www.maannews.net/eng/ViewDetails.aspx?ID=306795
 # the clocks were set back one hour at 2010-08-11 00:00:00 local time in
 # Gaza and the West Bank.
 # Some more background info:
 # https://www.timeanddate.com/news/time/westbank-gaza-end-dst-2010.html
 
 # From Steffen Thorsen (2011-08-26):
 # Gaza and the West Bank did go back to standard time in the beginning of
 # August, and will now enter daylight saving time again on 2011-08-30
 # 00:00 (so two periods of DST in 2011). The pause was because of
 # Ramadan.
 #
 # http://www.maannews.net/eng/ViewDetails.aspx?ID=416217
 # Additional info:
 # https://www.timeanddate.com/news/time/palestine-dst-2011.html
 
 # From Alexander Krivenyshev (2011-08-27):
 # According to the article in The Jerusalem Post:
 # "...Earlier this month, the Palestinian government in the West Bank decided to
 # move to standard time for 30 days, during Ramadan. The Palestinians in the
 # Gaza Strip accepted the change and also moved their clocks one hour back.
 # The Hamas government said on Saturday that it won't observe summertime after
 # the Muslim feast of Id al-Fitr, which begins on Tuesday..."
 # ...
 # https://www.jpost.com/MiddleEast/Article.aspx?id=235650
 # http://www.worldtimezone.com/dst_news/dst_news_gazastrip05.html
 # The rules for Egypt are stolen from the 'africa' file.
 
 # From Steffen Thorsen (2011-09-30):
 # West Bank did end Daylight Saving Time this morning/midnight (2011-09-30
 # 00:00).
 # So West Bank and Gaza now have the same time again.
 #
 # Many sources, including:
 # http://www.maannews.net/eng/ViewDetails.aspx?ID=424808
 
 # From Steffen Thorsen (2012-03-26):
 # Palestinian news sources tell that both Gaza and West Bank will start DST
 # on Friday (Thursday midnight, 2012-03-29 24:00).
 # Some of many sources in Arabic:
 # http://www.samanews.com/index.php?act=Show&id=122638
 #
 # http://safa.ps/details/news/74352/%D8%A8%D8%AF%D8%A1-%D8%A7%D9%84%D8%AA%D9%88%D9%82%D9%8A%D8%AA-%D8%A7%D9%84%D8%B5%D9%8A%D9%81%D9%8A-%D8%A8%D8%A7%D9%84%D8%B6%D9%81%D8%A9-%D9%88%D8%BA%D8%B2%D8%A9-%D9%84%D9%8A%D9%84%D8%A9-%D8%A7%D9%84%D8%AC%D9%85%D8%B9%D8%A9.html
 #
 # Our brief summary:
 # https://www.timeanddate.com/news/time/gaza-west-bank-dst-2012.html
 
 # From Steffen Thorsen (2013-03-26):
 # The following news sources tells that Palestine will "start daylight saving
 # time from midnight on Friday, March 29, 2013" (translated).
 # [These are in Arabic and are for Gaza and for Ramallah, respectively.]
 # http://www.samanews.com/index.php?act=Show&id=154120
 # http://safa.ps/details/news/99844/%D8%B1%D8%A7%D9%85-%D8%A7%D9%84%D9%84%D9%87-%D8%A8%D8%AF%D8%A1-%D8%A7%D9%84%D8%AA%D9%88%D9%82%D9%8A%D8%AA-%D8%A7%D9%84%D8%B5%D9%8A%D9%81%D9%8A-29-%D8%A7%D9%84%D8%AC%D8%A7%D8%B1%D9%8A.html
 
 # From Steffen Thorsen (2013-09-24):
 # The Gaza and West Bank are ending DST Thursday at midnight
 # (2013-09-27 00:00:00) (one hour earlier than last year...).
 # This source in English, says "that winter time will go into effect
 # at midnight on Thursday in the West Bank and Gaza Strip":
 # http://english.wafa.ps/index.php?action=detail&id=23246
 # official source...:
 # http://www.palestinecabinet.gov.ps/ar/Views/ViewDetails.aspx?pid=1252
 
 # From Steffen Thorsen (2015-03-03):
 # Sources such as http://www.alquds.com/news/article/view/id/548257
 # and https://www.raya.ps/ar/news/890705.html say Palestine areas will
 # start DST on 2015-03-28 00:00 which is one day later than expected.
 #
 # From Paul Eggert (2015-03-03):
 # https://www.timeanddate.com/time/change/west-bank/ramallah?year=2014
 # says that the fall 2014 transition was Oct 23 at 24:00.
 
 # From Hannah Kreitem (2016-03-09):
 # http://www.palestinecabinet.gov.ps/WebSite/ar/ViewDetails?ID=31728
 # [Google translation]: "The Council also decided to start daylight
 # saving in Palestine as of one o'clock on Saturday morning,
 # 2016-03-26, to provide the clock 60 minutes ahead."
 
 # From Sharef Mustafa (2016-10-19):
 # [T]he Palestinian cabinet decision (Mar 8th 2016) published on
 # http://www.palestinecabinet.gov.ps/WebSite/Upload/Decree/GOV_17/16032016134830.pdf
 # states that summer time will end on Oct 29th at 01:00.
 
 # From Sharef Mustafa (2018-03-16):
 # Palestine summer time will start on Mar 24th 2018 ...
 # http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a42ab7-ee23-435a-b9c8-a4f7e81f3817
 
 # From Even Scharning (2019-03-23):
 # http://pnn.ps/news/401130
 # http://palweather.ps/ar/node/50136.html
 #
 # From Sharif Mustafa (2019-03-26):
 # The Palestinian cabinet announced today that the switch to DST will
 # be on Fri Mar 29th 2019 by advancing the clock by 60 minutes.
 # http://palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e54e9ea1-50ee-4137-84df-0d6c78da259b
 #
 # From Even Scharning (2019-04-10):
 # Our source in Palestine said it happened Friday 29 at 00:00 local time....
 
 # From Sharef Mustafa (2019-10-18):
 # Palestine summer time will end on midnight Oct 26th 2019 ...
 #
 # From Steffen Thorsen (2020-10-20):
 # Some sources such as these say, and display on clocks, that DST ended at
 # midnight last year...
 # https://www.amad.ps/ar/post/320006
 #
 # From Tim Parenti (2020-10-20):
 # The report of the Palestinian Cabinet meeting of 2019-10-14 confirms
 # a decision on (translated): "The start of the winter time in Palestine, by
 # delaying the clock by sixty minutes, starting from midnight on Friday /
 # Saturday corresponding to 26/10/2019."
 # http://www.palestinecabinet.gov.ps/portal/meeting/details/43948
 
 # From Sharef Mustafa (2020-10-20):
 # As per the palestinian cabinet announcement yesterday , the day light saving
 # shall [end] on Oct 24th 2020 at 01:00AM by delaying the clock by 60 minutes.
 # http://www.palestinecabinet.gov.ps/portal/Meeting/Details/51584
 
 # From Pierre Cashon (2020-10-20):
 # The summer time this year started on March 28 at 00:00.
 # https://wafa.ps/ar_page.aspx?id=GveQNZa872839351758aGveQNZ
 # http://www.palestinecabinet.gov.ps/portal/meeting/details/50284
 # The winter time in 2015 started on October 23 at 01:00.
 # https://wafa.ps/ar_page.aspx?id=CgpCdYa670694628582aCgpCdY
 # http://www.palestinecabinet.gov.ps/portal/meeting/details/27583
 
 # From P Chan (2021-10-18):
 # http://wafa.ps/Pages/Details/34701
 # Palestine winter time will start from midnight 2021-10-29 (Thursday-Friday).
 #
 # From Heba Hemad, Palestine Ministry of Telecom & IT (2021-10-20):
 # ... winter time will begin in Palestine from Friday 10-29, 01:00 AM
 # by 60 minutes backwards.
 #
 # From Tim Parenti (2021-10-25), per Paul Eggert (2021-10-24):
 # Guess future fall transitions at 01:00 on the Friday preceding October's
 # last Sunday (i.e., Fri>=23), as this is more consistent with recent practice.
 
 # From Heba Hamad (2022-03-10):
 # summer time will begin in Palestine from Sunday 03-27-2022, 00:00 AM.
 
 # From Heba Hamad (2022-08-30):
 # winter time will begin in Palestine from Saturday 10-29, 02:00 AM by
 # 60 minutes backwards.  Also the state of Palestine adopted the summer
 # and winter time for the years: 2023,2024,2025,2026 ...
 # https://mm.icann.org/pipermail/tz/attachments/20220830/9f024566/Time-0001.pdf
 # (2022-08-31): ... the Saturday before the last Sunday in March and October
 # at 2:00 AM ,for the years from 2023 to 2026.
 # (2022-09-05): https://mtit.pna.ps/Site/New/1453
 #
 # From Paul Eggert (2022-08-31):
 # For now, assume that this rule will also be used after 2026.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule EgyptAsia	1957	only	-	May	10	0:00	1:00	S
 Rule EgyptAsia	1957	1958	-	Oct	 1	0:00	0	-
 Rule EgyptAsia	1958	only	-	May	 1	0:00	1:00	S
 Rule EgyptAsia	1959	1967	-	May	 1	1:00	1:00	S
 Rule EgyptAsia	1959	1965	-	Sep	30	3:00	0	-
 Rule EgyptAsia	1966	only	-	Oct	 1	3:00	0	-
 
 Rule Palestine	1999	2005	-	Apr	Fri>=15	0:00	1:00	S
 Rule Palestine	1999	2003	-	Oct	Fri>=15	0:00	0	-
 Rule Palestine	2004	only	-	Oct	 1	1:00	0	-
 Rule Palestine	2005	only	-	Oct	 4	2:00	0	-
 Rule Palestine	2006	2007	-	Apr	 1	0:00	1:00	S
 Rule Palestine	2006	only	-	Sep	22	0:00	0	-
 Rule Palestine	2007	only	-	Sep	13	2:00	0	-
 Rule Palestine	2008	2009	-	Mar	lastFri	0:00	1:00	S
 Rule Palestine	2008	only	-	Sep	 1	0:00	0	-
 Rule Palestine	2009	only	-	Sep	 4	1:00	0	-
 Rule Palestine	2010	only	-	Mar	26	0:00	1:00	S
 Rule Palestine	2010	only	-	Aug	11	0:00	0	-
 Rule Palestine	2011	only	-	Apr	 1	0:01	1:00	S
 Rule Palestine	2011	only	-	Aug	 1	0:00	0	-
 Rule Palestine	2011	only	-	Aug	30	0:00	1:00	S
 Rule Palestine	2011	only	-	Sep	30	0:00	0	-
 Rule Palestine	2012	2014	-	Mar	lastThu	24:00	1:00	S
 Rule Palestine	2012	only	-	Sep	21	1:00	0	-
 Rule Palestine	2013	only	-	Sep	27	0:00	0	-
 Rule Palestine	2014	only	-	Oct	24	0:00	0	-
 Rule Palestine	2015	only	-	Mar	28	0:00	1:00	S
 Rule Palestine	2015	only	-	Oct	23	1:00	0	-
 Rule Palestine	2016	2018	-	Mar	Sat<=30	1:00	1:00	S
 Rule Palestine	2016	2018	-	Oct	Sat<=30	1:00	0	-
 Rule Palestine	2019	only	-	Mar	29	0:00	1:00	S
 Rule Palestine	2019	only	-	Oct	Sat<=30	0:00	0	-
 Rule Palestine	2020	2021	-	Mar	Sat<=30	0:00	1:00	S
 Rule Palestine	2020	only	-	Oct	24	1:00	0	-
 Rule Palestine	2021	only	-	Oct	29	1:00	0	-
 Rule Palestine	2022	only	-	Mar	27	0:00	1:00	S
 Rule Palestine	2022	max	-	Oct	Sat<=30	2:00	0	-
 Rule Palestine	2023	max	-	Mar	Sat<=30	2:00	1:00	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Gaza	2:17:52	-	LMT	1900 Oct
 			2:00	Zion	EET/EEST 1948 May 15
 			2:00 EgyptAsia	EE%sT	1967 Jun  5
 			2:00	Zion	I%sT	1996
 			2:00	Jordan	EE%sT	1999
 			2:00 Palestine	EE%sT	2008 Aug 29  0:00
 			2:00	-	EET	2008 Sep
 			2:00 Palestine	EE%sT	2010
 			2:00	-	EET	2010 Mar 27  0:01
 			2:00 Palestine	EE%sT	2011 Aug  1
 			2:00	-	EET	2012
 			2:00 Palestine	EE%sT
 
 Zone	Asia/Hebron	2:20:23	-	LMT	1900 Oct
 			2:00	Zion	EET/EEST 1948 May 15
 			2:00 EgyptAsia	EE%sT	1967 Jun  5
 			2:00	Zion	I%sT	1996
 			2:00	Jordan	EE%sT	1999
 			2:00 Palestine	EE%sT
 
 # Paracel Is
 # no information
 
 # Philippines
 
 # From Paul Eggert (2018-11-18):
 # The Spanish initially used American (west-of-Greenwich) time.
 # It is unknown what time Manila kept when the British occupied it from
 # 1762-10-06 through 1764-04; for now assume it kept American time.
 # On 1844-08-16, Narciso Clavería, governor-general of the
 # Philippines, issued a proclamation announcing that 1844-12-30 was to
 # be immediately followed by 1845-01-01; see R.H. van Gent's
 # History of the International Date Line
 # https://www.staff.science.uu.nl/~gent0113/idl/idl_philippines.htm
 # The rest of the data entries are from Shanks & Pottenger.
 
 # From Jesper Nørgaard Welen (2006-04-26):
 # ... claims that Philippines had DST last time in 1990:
 # http://story.philippinetimes.com/p.x/ct/9/id/145be20cc6b121c0/cid/3e5bbccc730d258c/
 # [a story dated 2006-04-25 by Cris Larano of Dow Jones Newswires,
 # but no details]
 
 # From Paul Eggert (2014-08-14):
 # The following source says DST may be instituted November-January and again
 # March-June, but this is not definite.  It also says DST was last proclaimed
 # during the Ramos administration (1992-1998); but again, no details.
 # Carcamo D. PNoy urged to declare use of daylight saving time.
 # Philippine Star 2014-08-05
 # http://www.philstar.com/headlines/2014/08/05/1354152/pnoy-urged-declare-use-daylight-saving-time
 
 # From Paul Goyette (2018-06-15):
 # In the Philippines, there is a national law, Republic Act No. 10535
 # which declares the official time here as "Philippine Standard Time".
 # The act [1] even specifies use of PST as the abbreviation, although
 # the FAQ provided by PAGASA [2] uses the "acronym PhST to distinguish
 # it from the Pacific Standard Time (PST)."
 # [1] http://www.officialgazette.gov.ph/2013/05/15/republic-act-no-10535/
 # [2] https://www1.pagasa.dost.gov.ph/index.php/astronomy/philippine-standard-time#republic-act-10535
 #
 # From Paul Eggert (2018-06-19):
 # I surveyed recent news reports, and my impression is that "PST" is
 # more popular among reliable English-language news sources.  This is
 # not just a measure of Google hit counts: it's also the sizes and
 # influence of the sources.  There is no current abbreviation for DST,
 # so use "PDT", the usual American style.
 
 # From P Chan (2021-05-10):
 # Here's a fairly comprehensive article in Japanese:
 # https://wiki.suikawiki.org/n/Philippine%20Time
 # From Paul Eggert (2021-05-10):
 # The info in the Japanese table has not been absorbed (yet) below.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Phil	1936	only	-	Nov	1	0:00	1:00	D
 Rule	Phil	1937	only	-	Feb	1	0:00	0	S
 Rule	Phil	1954	only	-	Apr	12	0:00	1:00	D
 Rule	Phil	1954	only	-	Jul	1	0:00	0	S
 Rule	Phil	1978	only	-	Mar	22	0:00	1:00	D
 Rule	Phil	1978	only	-	Sep	21	0:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Manila	-15:56:00 -	LMT	1844 Dec 31
 			8:04:00 -	LMT	1899 May 11
 			8:00	Phil	P%sT	1942 May
 			9:00	-	JST	1944 Nov
 			8:00	Phil	P%sT
 
 # Bahrain
 # Qatar
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Qatar	3:26:08 -	LMT	1920     # Al Dawhah / Doha
 			4:00	-	+04	1972 Jun
 			3:00	-	+03
 
 # Kuwait
 # Saudi Arabia
 # Yemen
 #
 # Japan's year-round bases in Antarctica match this since 1970.
 #
 # From Paul Eggert (2018-08-29):
 # Time in Saudi Arabia and other countries in the Arabian peninsula was not
 # standardized until 1968 or so; we don't know exactly when, and possibly it
 # has never been made official.  Richard P Hunt, in "Islam city yielding to
 # modern times", New York Times (1961-04-09), p 20, wrote that only airlines
 # observed standard time, and that people in Jeddah mostly observed quasi-solar
 # time, doing so by setting their watches at sunrise to 6 o'clock (or to 12
 # o'clock for "Arab" time).
 #
 # Timekeeping differed depending on who you were and which part of Saudi
 # Arabia you were in.  In 1969, Elias Antar wrote that although a common
 # practice had been to set one's watch to 12:00 (i.e., midnight) at sunset -
 # which meant that the time on one side of a mountain could differ greatly from
 # the time on the other side - many foreigners set their watches to 6pm
 # instead, while airlines instead used UTC +03 (except in Dhahran, where they
 # used UTC +04), Aramco used UTC +03 with DST, and the Trans-Arabian Pipe Line
 # Company used Aramco time in eastern Saudi Arabia and airline time in western.
 # (The American Military Aid Advisory Group used plain UTC.)  Antar writes,
 # "A man named Higgins, so the story goes, used to run a local power
 # station. One day, the whole thing became too much for Higgins and he
 # assembled his staff and laid down the law. 'I've had enough of this,' he
 # shrieked. 'It is now 12 o'clock Higgins Time, and from now on this station is
 # going to run on Higgins Time.' And so, until last year, it did."  See:
 # Antar E. Dinner at When? Saudi Aramco World, 1969 March/April. 2-3.
 # http://archive.aramcoworld.com/issue/196902/dinner.at.when.htm
 # Also see: Antar EN. Arabian flying is confusing.
 # Port Angeles (WA) Evening News. 1965-03-10. page 3.
 #
 # The TZ database cannot represent quasi-solar time; airline time is the best
 # we can do.  The 1946 foreign air news digest of the U.S. Civil Aeronautics
 # Board (OCLC 42299995) reported that the "... Arabian Government, inaugurated
 # a weekly Dhahran-Cairo service, via the Saudi Arabian cities of Riyadh and
 # Jidda, on March 14, 1947".  Shanks & Pottenger guessed 1950; go with the
 # earlier date.
 #
 # Shanks & Pottenger also state that until 1968-05-01 Saudi Arabia had two
 # time zones; the other zone, at UT +04, was in the far eastern part of
 # the country.  Presumably this is documenting airline time.  Ignore this,
 # as it's before our 1970 cutoff.
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Riyadh	3:06:52 -	LMT	1947 Mar 14
 			3:00	-	+03
 
 # Singapore
 # taken from Mok Ly Yng (2003-10-30)
 # https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Singapore	6:55:25 -	LMT	1901 Jan  1
 			6:55:25	-	SMT	1905 Jun  1 # Singapore M.T.
 			7:00	-	+07	1933 Jan  1
 			7:00	0:20	+0720	1936 Jan  1
 			7:20	-	+0720	1941 Sep  1
 			7:30	-	+0730	1942 Feb 16
 			9:00	-	+09	1945 Sep 12
-			7:30	-	+0730	1982 Jan  1
+			7:30	-	+0730	1981 Dec 31 16:00u
 			8:00	-	+08
 
 # Spratly Is
 # no information
 
 # Sri Lanka
 
 # From Paul Eggert (2013-02-21):
 # Milne says "Madras mean time use from May 1, 1898.  Prior to this Colombo
 # mean time, 5h. 4m. 21.9s. F., was used."  But 5:04:21.9 differs considerably
 # from Colombo's meridian 5:19:24, so for now ignore Milne and stick with
 # Shanks and Pottenger.
 
 # From Paul Eggert (1996-09-03):
 # "Sri Lanka advances clock by an hour to avoid blackout"
 # (, 1996-05-24,
 # no longer available as of 1999-08-17)
 # reported "the country's standard time will be put forward by one hour at
 # midnight Friday (1830 GMT) 'in the light of the present power crisis'."
 #
 # From Dharmasiri Senanayake, Sri Lanka Media Minister (1996-10-24), as quoted
 # by Shamindra in Daily News - Hot News Section
 #  (1996-10-26):
 # With effect from 12.30 a.m. on 26th October 1996
 # Sri Lanka will be six (06) hours ahead of GMT.
 
 # From Jesper Nørgaard Welen (2006-04-14), quoting Sri Lanka News Online
 #  (2006-04-13):
 # 0030 hrs on April 15, 2006 (midnight of April 14, 2006 +30 minutes)
 # at present, become 2400 hours of April 14, 2006 (midnight of April 14, 2006).
 
 # From Peter Apps and Ranga Sirila of Reuters (2006-04-12) in:
 # http://today.reuters.co.uk/news/newsArticle.aspx?type=scienceNews&storyID=2006-04-12T172228Z_01_COL295762_RTRIDST_0_SCIENCE-SRILANKA-TIME-DC.XML
 # [The Tamil Tigers] never accepted the original 1996 time change and simply
 # kept their clocks set five and a half hours ahead of Greenwich Mean
 # Time (GMT), in line with neighbor India.
 # From Paul Eggert (2006-04-18):
 # People who live in regions under Tamil control can use [TZ='Asia/Kolkata'],
 # as that zone has agreed with the Tamil areas since our cutoff date of 1970.
 
 # From Sadika Sumanapala (2016-10-19):
 # According to http://www.sltime.org (maintained by Measurement Units,
 # Standards & Services Department, Sri Lanka) abbreviation for Sri Lanka
 # standard time is SLST.
 #
 # From Paul Eggert (2016-10-18):
 # "SLST" seems to be reasonably recent and rarely-used outside time
 # zone nerd sources.  I searched Google News and found three uses of
 # it in the International Business Times of India in February and
 # March of this year when discussing cricket match times, but nothing
 # since then (though there has been a lot of cricket) and nothing in
 # other English-language news sources.  Our old abbreviation "LKT" is
 # even worse.  For now, let's use a numeric abbreviation; we can
 # switch to "SLST" if it catches on.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Colombo	5:19:24 -	LMT	1880
 			5:19:32	-	MMT	1906        # Moratuwa Mean Time
 			5:30	-	+0530	1942 Jan  5
 			5:30	0:30	+06	1942 Sep
 			5:30	1:00	+0630	1945 Oct 16  2:00
 			5:30	-	+0530	1996 May 25  0:00
 			6:30	-	+0630	1996 Oct 26  0:30
 			6:00	-	+06	2006 Apr 15  0:30
 			5:30	-	+0530
 
 # Syria
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Syria	1920	1923	-	Apr	Sun>=15	2:00	1:00	S
 Rule	Syria	1920	1923	-	Oct	Sun>=1	2:00	0	-
 Rule	Syria	1962	only	-	Apr	29	2:00	1:00	S
 Rule	Syria	1962	only	-	Oct	1	2:00	0	-
 Rule	Syria	1963	1965	-	May	1	2:00	1:00	S
 Rule	Syria	1963	only	-	Sep	30	2:00	0	-
 Rule	Syria	1964	only	-	Oct	1	2:00	0	-
 Rule	Syria	1965	only	-	Sep	30	2:00	0	-
 Rule	Syria	1966	only	-	Apr	24	2:00	1:00	S
 Rule	Syria	1966	1976	-	Oct	1	2:00	0	-
 Rule	Syria	1967	1978	-	May	1	2:00	1:00	S
 Rule	Syria	1977	1978	-	Sep	1	2:00	0	-
 Rule	Syria	1983	1984	-	Apr	9	2:00	1:00	S
 Rule	Syria	1983	1984	-	Oct	1	2:00	0	-
 Rule	Syria	1986	only	-	Feb	16	2:00	1:00	S
 Rule	Syria	1986	only	-	Oct	9	2:00	0	-
 Rule	Syria	1987	only	-	Mar	1	2:00	1:00	S
 Rule	Syria	1987	1988	-	Oct	31	2:00	0	-
 Rule	Syria	1988	only	-	Mar	15	2:00	1:00	S
 Rule	Syria	1989	only	-	Mar	31	2:00	1:00	S
 Rule	Syria	1989	only	-	Oct	1	2:00	0	-
 Rule	Syria	1990	only	-	Apr	1	2:00	1:00	S
 Rule	Syria	1990	only	-	Sep	30	2:00	0	-
 Rule	Syria	1991	only	-	Apr	 1	0:00	1:00	S
 Rule	Syria	1991	1992	-	Oct	 1	0:00	0	-
 Rule	Syria	1992	only	-	Apr	 8	0:00	1:00	S
 Rule	Syria	1993	only	-	Mar	26	0:00	1:00	S
 Rule	Syria	1993	only	-	Sep	25	0:00	0	-
 # IATA SSIM (1998-02) says 1998-04-02;
 # (1998-09) says 1999-03-29 and 1999-09-29; (1999-02) says 1999-04-02,
 # 2000-04-02, and 2001-04-02; (1999-09) says 2000-03-31 and 2001-03-31;
 # (2006) says 2006-03-31 and 2006-09-22;
 # for now ignore all these claims and go with Shanks & Pottenger,
 # except for the 2006-09-22 claim (which seems right for Ramadan).
 Rule	Syria	1994	1996	-	Apr	 1	0:00	1:00	S
 Rule	Syria	1994	2005	-	Oct	 1	0:00	0	-
 Rule	Syria	1997	1998	-	Mar	lastMon	0:00	1:00	S
 Rule	Syria	1999	2006	-	Apr	 1	0:00	1:00	S
 # From Stephen Colebourne (2006-09-18):
 # According to IATA data, Syria will change DST on 21st September [21:00 UTC]
 # this year [only]....  This is probably related to Ramadan, like Egypt.
 Rule	Syria	2006	only	-	Sep	22	0:00	0	-
 # From Paul Eggert (2007-03-29):
 # Today the AP reported "Syria will switch to summertime at midnight Thursday."
 # http://www.iht.com/articles/ap/2007/03/29/africa/ME-GEN-Syria-Time-Change.php
 Rule	Syria	2007	only	-	Mar	lastFri	0:00	1:00	S
 # From Jesper Nørgaard (2007-10-27):
 # The sister center ICARDA of my work CIMMYT is confirming that Syria DST will
 # not take place 1st November at 0:00 o'clock but 1st November at 24:00 or
 # rather Midnight between Thursday and Friday. This does make more sense than
 # having it between Wednesday and Thursday (two workdays in Syria) since the
 # weekend in Syria is not Saturday and Sunday, but Friday and Saturday. So now
 # it is implemented at midnight of the last workday before weekend...
 #
 # From Steffen Thorsen (2007-10-27):
 # Jesper Nørgaard Welen wrote:
 #
 # > "Winter local time in Syria will be observed at midnight of Thursday 1
 # > November 2007, and the clock will be put back 1 hour."
 #
 # I found confirmation on this in this gov.sy-article (Arabic):
 # http://wehda.alwehda.gov.sy/_print_veiw.asp?FileName=12521710520070926111247
 #
 # which using Google's translate tools says:
 # Council of Ministers also approved the commencement of work on
 # identifying the winter time as of Friday, 2/11/2007 where the 60th
 # minute delay at midnight Thursday 1/11/2007.
 Rule	Syria	2007	only	-	Nov	 Fri>=1	0:00	0	-
 
 # From Stephen Colebourne (2008-03-17):
 # For everyone's info, I saw an IATA time zone change for [Syria] for
 # this month (March 2008) in the last day or so....
 # Country     Time Standard   --- DST Start ---   --- DST End ---  DST
 # Name        Zone Variation   Time    Date        Time    Date
 # Variation
 # Syrian Arab
 # Republic    SY    +0200      2200  03APR08       2100  30SEP08   +0300
 #                              2200  02APR09       2100  30SEP09   +0300
 #                              2200  01APR10       2100  30SEP10   +0300
 
 # From Arthur David Olson (2008-03-17):
 # Here's a link to English-language coverage by the Syrian Arab News
 # Agency (SANA)...
 # http://www.sana.sy/eng/21/2008/03/11/165173.htm
 # ...which reads (in part) "The Cabinet approved the suggestion of the
 # Ministry of Electricity to begin daylight savings time on Friday April
 # 4th, advancing clocks one hour ahead on midnight of Thursday April 3rd."
 # Since Syria is two hours east of UTC, the 2200 and 2100 transition times
 # shown above match up with midnight in Syria.
 
 # From Arthur David Olson (2008-03-18):
 # My best guess at a Syrian rule is "the Friday nearest April 1";
 # coding that involves either using a "Mar Fri>=29" construct that old time zone
 # compilers can't handle  or having multiple Rules (a la Israel).
 # For now, use "Apr Fri>=1", and go with IATA on a uniform Sep 30 end.
 
 # From Steffen Thorsen (2008-10-07):
 # Syria has now officially decided to end DST on 2008-11-01 this year,
 # according to the following article in the Syrian Arab News Agency (SANA).
 #
 # The article is in Arabic, and seems to tell that they will go back to
 # winter time on 2008-11-01 at 00:00 local daylight time (delaying/setting
 # clocks back 60 minutes).
 #
 # http://sana.sy/ara/2/2008/10/07/195459.htm
 
 # From Steffen Thorsen (2009-03-19):
 # Syria will start DST on 2009-03-27 00:00 this year according to many sources,
 # two examples:
 #
 # http://www.sana.sy/eng/21/2009/03/17/217563.htm
 # (English, Syrian Arab News # Agency)
 # http://thawra.alwehda.gov.sy/_View_news2.asp?FileName=94459258720090318012209
 # (Arabic, gov-site)
 #
 # We have not found any sources saying anything about when DST ends this year.
 #
 # Our summary
 # https://www.timeanddate.com/news/time/syria-dst-starts-march-27-2009.html
 
 # From Steffen Thorsen (2009-10-27):
 # The Syrian Arab News Network on 2009-09-29 reported that Syria will
 # revert back to winter (standard) time on midnight between Thursday
 # 2009-10-29 and Friday 2009-10-30:
 # http://www.sana.sy/ara/2/2009/09/29/247012.htm (Arabic)
 
 # From Arthur David Olson (2009-10-28):
 # We'll see if future DST switching times turn out to be end of the last
 # Thursday of the month or the start of the last Friday of the month or
 # something else. For now, use the start of the last Friday.
 
 # From Steffen Thorsen (2010-03-17):
 # The "Syrian News Station" reported on 2010-03-16 that the Council of
 # Ministers has decided that Syria will start DST on midnight Thursday
 # 2010-04-01: (midnight between Thursday and Friday):
 # http://sns.sy/sns/?path=news/read/11421 (Arabic)
 
 # From Steffen Thorsen (2012-03-26):
 # Today, Syria's government announced that they will start DST early on Friday
 # (00:00). This is a bit earlier than the past two years.
 #
 # From Syrian Arab News Agency, in Arabic:
 # http://www.sana.sy/ara/2/2012/03/26/408215.htm
 #
 # Our brief summary:
 # https://www.timeanddate.com/news/time/syria-dst-2012.html
 
 # From Steffen Thorsen (2022-10-05):
 # Syria is adopting year-round DST, starting this autumn....
 # From https://www.enabbaladi.net/archives/607812
 # "This [the decision] came after the weekly government meeting today,
 # Tuesday 4 October ..."
 #
 # From Paul Eggert (2022-10-05):
 # Like Jordan, model this as a transition from EEST +03 (DST) to plain +03
 # (non-DST) at the point where DST would otherwise have ended.
 
 Rule	Syria	2008	only	-	Apr	Fri>=1	0:00	1:00	S
 Rule	Syria	2008	only	-	Nov	1	0:00	0	-
 Rule	Syria	2009	only	-	Mar	lastFri	0:00	1:00	S
 Rule	Syria	2010	2011	-	Apr	Fri>=1	0:00	1:00	S
 Rule	Syria	2012	2022	-	Mar	lastFri	0:00	1:00	S
 Rule	Syria	2009	2022	-	Oct	lastFri	0:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Damascus	2:25:12 -	LMT	1920 # Dimashq
 			2:00	Syria	EE%sT	2022 Oct 28 0:00
 			3:00	-	+03
 
 # Tajikistan
 # From Shanks & Pottenger.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Dushanbe	4:35:12 -	LMT	1924 May  2
 			5:00	-	+05	1930 Jun 21
 			6:00 RussiaAsia +06/+07	1991 Mar 31  2:00s
 			5:00	1:00	+06	1991 Sep  9  2:00s
 			5:00	-	+05
 
 # Cambodia
 # Christmas I
 # Laos
 # Thailand
 # Vietnam (northern)
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Bangkok	6:42:04	-	LMT	1880
 			6:42:04	-	BMT	1920 Apr # Bangkok Mean Time
 			7:00	-	+07
 
 # Turkmenistan
 # From Shanks & Pottenger.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Ashgabat	3:53:32 -	LMT	1924 May  2 # or Ashkhabad
 			4:00	-	+04	1930 Jun 21
 			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00
 			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00
 			5:00	-	+05
 
 # Oman
 # Réunion
 # Seychelles
 # United Arab Emirates
 #
 # The Crozet Is also observe Réunion time; see the 'antarctica' file.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Dubai	3:41:12 -	LMT	1920
 			4:00	-	+04
 
 # Uzbekistan
 # Byalokoz 1919 says Uzbekistan was 4:27:53.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Samarkand	4:27:53 -	LMT	1924 May  2
 			4:00	-	+04	1930 Jun 21
 			5:00	-	+05	1981 Apr  1
 			5:00	1:00	+06	1981 Oct  1
 			6:00	-	+06	1982 Apr  1
 			5:00 RussiaAsia	+05/+06	1992
 			5:00	-	+05
 # Milne says Tashkent was 4:37:10.8.
 		#STDOFF	4:37:10.8
 Zone	Asia/Tashkent	4:37:11 -	LMT	1924 May  2
 			5:00	-	+05	1930 Jun 21
 			6:00 RussiaAsia	+06/+07	1991 Mar 31  2:00
 			5:00 RussiaAsia	+05/+06	1992
 			5:00	-	+05
 
 # Vietnam (southern)
 
 # From Paul Eggert (2014-10-04):
 # Milne gives 7:16:56 for the meridian of Saigon in 1899, as being
 # used in Lower Laos, Cambodia, and Annam.  But this is quite a ways
 # from Saigon's location.  For now, ignore this and stick with Shanks
 # and Pottenger for LMT before 1906.
 
 # From Arthur David Olson (2008-03-18):
 # The English-language name of Vietnam's most populous city is "Ho Chi Minh
 # City"; use Ho_Chi_Minh below to avoid a name of more than 14 characters.
 
 # From Paul Eggert (2022-07-27) after a 2014 heads-up from Trần Ngọc Quân:
 # Trần Tiến Bình's authoritative book "Lịch Việt Nam: thế kỷ XX-XXI (1901-2100)"
 # (Nhà xuất bản Văn Hoá - Thông Tin, Hanoi, 2005), pp 49-50,
 # is quoted verbatim in:
 # http://www.thoigian.com.vn/?mPage=P80D01
 # is translated by Brian Inglis in:
 # https://mm.icann.org/pipermail/tz/2014-October/021654.html
 # and is the basis for the information below.
 #
 # The 1906 transition was effective July 1 and standardized Indochina to
 # Phù Liễn Observatory, legally 104° 17' 17" east of Paris.
 # It's unclear whether this meant legal Paris Mean Time (00:09:21) or
 # the Paris Meridian; for now guess the former and round the exact
 # 07:06:30.1333... to 07:06:30.13 as the legal spec used 66 2/3 ms precision.
 # which is used below even though the modern-day Phù Liễn Observatory
 # is closer to 07:06:31.  Abbreviate Phù Liễn Mean Time as PLMT.
 #
 # The following transitions occurred in Indochina in general (before 1954)
 # and in South Vietnam in particular (after 1954):
 # To 07:00 on 1911-05-01.
 # To 08:00 on 1942-12-31 at 23:00.
 # To 09:00 on 1945-03-14 at 23:00.
 # To 07:00 on 1945-09-02 in Vietnam.
 # To 08:00 on 1947-04-01 in French-controlled Indochina.
 # To 07:00 on 1955-07-01 in South Vietnam.
 # To 08:00 on 1959-12-31 at 23:00 in South Vietnam.
 # To 07:00 on 1975-06-13 in South Vietnam.
 #
 # Trần cites the following sources; it's unclear which supplied the info above.
 #
 # Hoàng Xuân Hãn: "Lịch và lịch Việt Nam". Tập san Khoa học Xã hội,
 # No. 9, Paris, February 1982.
 #
 # Lê Thành Lân: "Lịch và niên biểu lịch sử hai mươi thế kỷ (0001-2010)",
 # NXB Thống kê, Hanoi, 2000.
 #
 # Lê Thành Lân: "Lịch hai thế kỷ (1802-2010) và các lịch vĩnh cửu",
 # NXB Thuận Hoá, Huế, 1995.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	7:06:30.13
 Zone Asia/Ho_Chi_Minh	7:06:30 -	LMT	1906 Jul  1
 			7:06:30	-	PLMT	1911 May  1 # Phù Liễn MT
 			7:00	-	+07	1942 Dec 31 23:00
 			8:00	-	+08	1945 Mar 14 23:00
 			9:00	-	+09	1945 Sep  2
 			7:00	-	+07	1947 Apr  1
 			8:00	-	+08	1955 Jul  1
 			7:00	-	+07	1959 Dec 31 23:00
 			8:00	-	+08	1975 Jun 13
 			7:00	-	+07
 
 # From Paul Eggert (2019-02-19):
 #
 # The Ho Chi Minh entry suffices for most purposes as it agrees with all of
 # Vietnam since 1975-06-13.  Presumably clocks often changed in south Vietnam
 # in the early 1970s as locations changed hands during the war; however the
 # details are unknown and would likely be too voluminous for this database.
 #
 # For timestamps in north Vietnam back to 1970 (the tzdb cutoff),
 # use Asia/Bangkok; see the VN entries in the file zone1970.tab.
 # For timestamps before 1970, see Asia/Hanoi in the file 'backzone'.
diff --git a/backward b/backward
index 4c1c5d5f8f71..0ae5d74108e6 100644
--- a/backward
+++ b/backward
@@ -1,317 +1,318 @@
 # tzdb links for backward compatibility
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # This file provides links from old or merged timezone names to current ones.
 # Many names changed in 1993 and in 1995, and many merged names moved here
 # in the period from 2013 through 2022.  Several of these names are
 # also present in the file 'backzone', which has data important only
 # for pre-1970 timestamps and so is out of scope for tzdb proper.
 
 # Although this file is optional and tzdb will work if you omit it by
 # building with 'make BACKWARD=', in practice downstream users
 # typically use this file for backward compatibility.
 
 # This file is divided into sections, one for each major reason for a
 # backward compatibility link.  Each section is sorted by link name.
 
 # A "#= TARGET1" comment labels each link inserted only because some
 # .zi parsers (including tzcode through 2022e) mishandle links to links.
 # The comment says what the target would be if these parsers were fixed
 # so that data could contain links to links.  For example, the line
 # "Link Australia/Sydney Australia/ACT #= Australia/Canberra" would be
 # "Link Australia/Canberra Australia/ACT" were it not that data lines
 # refrain from linking to links like Australia/Canberra, which means
 # the Australia/ACT line links instead to Australia/Sydney,
 # Australia/Canberra's target.
 
 
 # Pre-1993 naming conventions
 
 # Link	TARGET			LINK-NAME	#= TARGET1
 Link	Australia/Sydney	Australia/ACT	#= Australia/Canberra
 Link	Australia/Lord_Howe	Australia/LHI
 Link	Australia/Sydney	Australia/NSW
 Link	Australia/Darwin	Australia/North
 Link	Australia/Brisbane	Australia/Queensland
 Link	Australia/Adelaide	Australia/South
 Link	Australia/Hobart	Australia/Tasmania
 Link	Australia/Melbourne	Australia/Victoria
 Link	Australia/Perth		Australia/West
 Link	Australia/Broken_Hill	Australia/Yancowinna
 Link	America/Rio_Branco	Brazil/Acre	#= America/Porto_Acre
 Link	America/Noronha		Brazil/DeNoronha
 Link	America/Sao_Paulo	Brazil/East
 Link	America/Manaus		Brazil/West
 Link	America/Halifax		Canada/Atlantic
 Link	America/Winnipeg	Canada/Central
 # This line is commented out, as the name exceeded the 14-character limit
 # and was an unused misnomer.
 #Link	America/Regina		Canada/East-Saskatchewan
 Link	America/Toronto		Canada/Eastern
 Link	America/Edmonton	Canada/Mountain
 Link	America/St_Johns	Canada/Newfoundland
 Link	America/Vancouver	Canada/Pacific
 Link	America/Regina		Canada/Saskatchewan
 Link	America/Whitehorse	Canada/Yukon
 Link	America/Santiago	Chile/Continental
 Link	Pacific/Easter		Chile/EasterIsland
 Link	America/Havana		Cuba
 Link	Africa/Cairo		Egypt
 Link	Europe/Dublin		Eire
 # Vanguard section, for most .zi parsers.
 #Link	GMT			Etc/GMT
 #Link	GMT			Etc/GMT+0
 #Link	GMT			Etc/GMT-0
 #Link	GMT			Etc/GMT0
 #Link	GMT			Etc/Greenwich
 # Rearguard section, for TZUpdater 2.3.2 and earlier.
 Link	Etc/GMT			Etc/GMT+0
 Link	Etc/GMT			Etc/GMT-0
 Link	Etc/GMT			Etc/GMT0
 Link	Etc/GMT			Etc/Greenwich
 # End of rearguard section.
 Link	Etc/UTC			Etc/UCT
 Link	Etc/UTC			Etc/Universal
 Link	Etc/UTC			Etc/Zulu
 Link	Europe/London		GB
 Link	Europe/London		GB-Eire
 # Vanguard section, for most .zi parsers.
 #Link	GMT			GMT+0
 #Link	GMT			GMT-0
 #Link	GMT			GMT0
 #Link	GMT			Greenwich
 # Rearguard section, for TZUpdater 2.3.2 and earlier.
 Link	Etc/GMT			GMT+0
 Link	Etc/GMT			GMT-0
 Link	Etc/GMT			GMT0
 Link	Etc/GMT			Greenwich
 # End of rearguard section.
 Link	Asia/Hong_Kong		Hongkong
 Link	Africa/Abidjan		Iceland	#= Atlantic/Reykjavik
 Link	Asia/Tehran		Iran
 Link	Asia/Jerusalem		Israel
 Link	America/Jamaica		Jamaica
 Link	Asia/Tokyo		Japan
 Link	Pacific/Kwajalein	Kwajalein
 Link	Africa/Tripoli		Libya
 Link	America/Tijuana		Mexico/BajaNorte
 Link	America/Mazatlan	Mexico/BajaSur
 Link	America/Mexico_City	Mexico/General
 Link	Pacific/Auckland	NZ
 Link	Pacific/Chatham		NZ-CHAT
 Link	America/Denver		Navajo	#= America/Shiprock
 Link	Asia/Shanghai		PRC
 Link	Europe/Warsaw		Poland
 Link	Europe/Lisbon		Portugal
 Link	Asia/Taipei		ROC
 Link	Asia/Seoul		ROK
 Link	Asia/Singapore		Singapore
 Link	Europe/Istanbul		Turkey
 Link	Etc/UTC			UCT
 Link	America/Anchorage	US/Alaska
 Link	America/Adak		US/Aleutian
 Link	America/Phoenix		US/Arizona
 Link	America/Chicago		US/Central
 Link	America/Indiana/Indianapolis	US/East-Indiana
 Link	America/New_York	US/Eastern
 Link	Pacific/Honolulu	US/Hawaii
 Link	America/Indiana/Knox	US/Indiana-Starke
 Link	America/Detroit		US/Michigan
 Link	America/Denver		US/Mountain
 Link	America/Los_Angeles	US/Pacific
 Link	Pacific/Pago_Pago	US/Samoa
 Link	Etc/UTC			UTC
 Link	Etc/UTC			Universal
 Link	Europe/Moscow		W-SU
 Link	Etc/UTC			Zulu
 
 
 # Two-part names that were renamed mostly to three-part names in 1995
 
 # Link	TARGET				LINK-NAME	#= TARGET1
 Link	America/Argentina/Buenos_Aires	America/Buenos_Aires
 Link	America/Argentina/Catamarca	America/Catamarca
 Link	America/Argentina/Cordoba	America/Cordoba
 Link	America/Indiana/Indianapolis	America/Indianapolis
 Link	America/Argentina/Jujuy		America/Jujuy
 Link	America/Indiana/Knox		America/Knox_IN
 Link	America/Kentucky/Louisville	America/Louisville
 Link	America/Argentina/Mendoza	America/Mendoza
 Link	America/Puerto_Rico		America/Virgin	#= America/St_Thomas
 Link	Pacific/Pago_Pago		Pacific/Samoa
 
 
 # Pre-2013 practice, which typically had a Zone per zone.tab line
 
 # Link	TARGET			LINK-NAME
 Link	Africa/Abidjan		Africa/Accra
 Link	Africa/Nairobi		Africa/Addis_Ababa
 Link	Africa/Nairobi		Africa/Asmara
 Link	Africa/Abidjan		Africa/Bamako
 Link	Africa/Lagos		Africa/Bangui
 Link	Africa/Abidjan		Africa/Banjul
 Link	Africa/Maputo		Africa/Blantyre
 Link	Africa/Lagos		Africa/Brazzaville
 Link	Africa/Maputo		Africa/Bujumbura
 Link	Africa/Abidjan		Africa/Conakry
 Link	Africa/Abidjan		Africa/Dakar
 Link	Africa/Nairobi		Africa/Dar_es_Salaam
 Link	Africa/Nairobi		Africa/Djibouti
 Link	Africa/Lagos		Africa/Douala
 Link	Africa/Abidjan		Africa/Freetown
 Link	Africa/Maputo		Africa/Gaborone
 Link	Africa/Maputo		Africa/Harare
 Link	Africa/Nairobi		Africa/Kampala
 Link	Africa/Maputo		Africa/Kigali
 Link	Africa/Lagos		Africa/Kinshasa
 Link	Africa/Lagos		Africa/Libreville
 Link	Africa/Abidjan		Africa/Lome
 Link	Africa/Lagos		Africa/Luanda
 Link	Africa/Maputo		Africa/Lubumbashi
 Link	Africa/Maputo		Africa/Lusaka
 Link	Africa/Lagos		Africa/Malabo
 Link	Africa/Johannesburg	Africa/Maseru
 Link	Africa/Johannesburg	Africa/Mbabane
 Link	Africa/Nairobi		Africa/Mogadishu
 Link	Africa/Lagos		Africa/Niamey
 Link	Africa/Abidjan		Africa/Nouakchott
 Link	Africa/Abidjan		Africa/Ouagadougou
 Link	Africa/Lagos		Africa/Porto-Novo
 Link	America/Puerto_Rico	America/Anguilla
 Link	America/Puerto_Rico	America/Antigua
 Link	America/Puerto_Rico	America/Aruba
 Link	America/Panama		America/Atikokan
 Link	America/Puerto_Rico	America/Blanc-Sablon
 Link	America/Panama		America/Cayman
 Link	America/Phoenix		America/Creston
 Link	America/Puerto_Rico	America/Curacao
 Link	America/Puerto_Rico	America/Dominica
 Link	America/Puerto_Rico	America/Grenada
 Link	America/Puerto_Rico	America/Guadeloupe
 Link	America/Puerto_Rico	America/Kralendijk
 Link	America/Puerto_Rico	America/Lower_Princes
 Link	America/Puerto_Rico	America/Marigot
 Link	America/Puerto_Rico	America/Montserrat
 Link	America/Toronto		America/Nassau
 Link	America/Puerto_Rico	America/Port_of_Spain
 Link	America/Puerto_Rico	America/St_Barthelemy
 Link	America/Puerto_Rico	America/St_Kitts
 Link	America/Puerto_Rico	America/St_Lucia
 Link	America/Puerto_Rico	America/St_Thomas
 Link	America/Puerto_Rico	America/St_Vincent
 Link	America/Puerto_Rico	America/Tortola
 Link	Pacific/Port_Moresby	Antarctica/DumontDUrville
 Link	Pacific/Auckland	Antarctica/McMurdo
 Link	Asia/Riyadh		Antarctica/Syowa
 Link	Asia/Urumqi		Antarctica/Vostok
 Link	Europe/Berlin		Arctic/Longyearbyen
 Link	Asia/Riyadh		Asia/Aden
 Link	Asia/Qatar		Asia/Bahrain
 Link	Asia/Kuching		Asia/Brunei
 Link	Asia/Singapore		Asia/Kuala_Lumpur
 Link	Asia/Riyadh		Asia/Kuwait
 Link	Asia/Dubai		Asia/Muscat
 Link	Asia/Bangkok		Asia/Phnom_Penh
 Link	Asia/Bangkok		Asia/Vientiane
 Link	Africa/Abidjan		Atlantic/Reykjavik
 Link	Africa/Abidjan		Atlantic/St_Helena
 Link	Europe/Brussels		Europe/Amsterdam
 Link	Europe/Prague		Europe/Bratislava
 Link	Europe/Zurich		Europe/Busingen
 Link	Europe/Berlin		Europe/Copenhagen
 Link	Europe/London		Europe/Guernsey
 Link	Europe/London		Europe/Isle_of_Man
 Link	Europe/London		Europe/Jersey
 Link	Europe/Belgrade		Europe/Ljubljana
 Link	Europe/Brussels		Europe/Luxembourg
 Link	Europe/Helsinki		Europe/Mariehamn
 Link	Europe/Paris		Europe/Monaco
 Link	Europe/Berlin		Europe/Oslo
 Link	Europe/Belgrade		Europe/Podgorica
 Link	Europe/Rome		Europe/San_Marino
 Link	Europe/Belgrade		Europe/Sarajevo
 Link	Europe/Belgrade		Europe/Skopje
 Link	Europe/Berlin		Europe/Stockholm
 Link	Europe/Zurich		Europe/Vaduz
 Link	Europe/Rome		Europe/Vatican
 Link	Europe/Belgrade		Europe/Zagreb
 Link	Africa/Nairobi		Indian/Antananarivo
 Link	Asia/Bangkok		Indian/Christmas
 Link	Asia/Yangon		Indian/Cocos
 Link	Africa/Nairobi		Indian/Comoro
 Link	Indian/Maldives		Indian/Kerguelen
 Link	Asia/Dubai		Indian/Mahe
 Link	Africa/Nairobi		Indian/Mayotte
 Link	Asia/Dubai		Indian/Reunion
 Link	Pacific/Port_Moresby	Pacific/Chuuk
 Link	Pacific/Tarawa		Pacific/Funafuti
 Link	Pacific/Tarawa		Pacific/Majuro
 Link	Pacific/Pago_Pago	Pacific/Midway
 Link	Pacific/Guadalcanal	Pacific/Pohnpei
 Link	Pacific/Guam		Pacific/Saipan
 Link	Pacific/Tarawa		Pacific/Wake
 Link	Pacific/Tarawa		Pacific/Wallis
 
 
 # Non-zone.tab locations with timestamps since 1970 that duplicate
 # those of an existing location
 
 # Link	TARGET			LINK-NAME
 Link	Africa/Abidjan		Africa/Timbuktu
 Link	America/Argentina/Catamarca	America/Argentina/ComodRivadavia
 Link	America/Adak		America/Atka
 Link	America/Panama		America/Coral_Harbour
 Link	America/Tijuana		America/Ensenada
 Link	America/Indiana/Indianapolis	America/Fort_Wayne
 Link	America/Toronto		America/Montreal
 Link	America/Toronto		America/Nipigon
+Link	America/Iqaluit		America/Pangnirtung
 Link	America/Rio_Branco	America/Porto_Acre
 Link	America/Winnipeg	America/Rainy_River
 Link	America/Argentina/Cordoba	America/Rosario
 Link	America/Tijuana		America/Santa_Isabel
 Link	America/Denver		America/Shiprock
 Link	America/Toronto		America/Thunder_Bay
 Link	Pacific/Auckland	Antarctica/South_Pole
 Link	Asia/Shanghai		Asia/Chongqing
 Link	Asia/Shanghai		Asia/Harbin
 Link	Asia/Urumqi		Asia/Kashgar
 Link	Asia/Jerusalem		Asia/Tel_Aviv
 Link	Europe/Berlin		Atlantic/Jan_Mayen
 Link	Australia/Sydney	Australia/Canberra
 Link	Australia/Hobart	Australia/Currie
 Link	Europe/London		Europe/Belfast
 Link	Europe/Chisinau		Europe/Tiraspol
 Link	Europe/Kyiv		Europe/Uzhgorod
 Link	Europe/Kyiv		Europe/Zaporozhye
 Link	Pacific/Kanton		Pacific/Enderbury
 Link	Pacific/Honolulu	Pacific/Johnston
 Link	Pacific/Port_Moresby	Pacific/Yap
 
 
 # Alternate names for the same location
 
 # Link	TARGET			LINK-NAME	#= TARGET1
 Link	Africa/Nairobi		Africa/Asmera	#= Africa/Asmara
 Link	America/Nuuk		America/Godthab
 Link	Asia/Ashgabat		Asia/Ashkhabad
 Link	Asia/Kolkata		Asia/Calcutta
 Link	Asia/Shanghai		Asia/Chungking	#= Asia/Chongqing
 Link	Asia/Dhaka		Asia/Dacca
 # Istanbul is in both continents.
 Link	Europe/Istanbul		Asia/Istanbul
 Link	Asia/Kathmandu		Asia/Katmandu
 Link	Asia/Macau		Asia/Macao
 Link	Asia/Yangon		Asia/Rangoon
 Link	Asia/Ho_Chi_Minh	Asia/Saigon
 Link	Asia/Thimphu		Asia/Thimbu
 Link	Asia/Makassar		Asia/Ujung_Pandang
 Link	Asia/Ulaanbaatar	Asia/Ulan_Bator
 Link	Atlantic/Faroe		Atlantic/Faeroe
 Link	Europe/Kyiv		Europe/Kiev
 # Classically, Cyprus is in Asia; e.g. see Herodotus, Histories, I.72.
 # However, for various reasons many users expect to find it under Europe.
 Link	Asia/Nicosia		Europe/Nicosia
 Link	Pacific/Guadalcanal	Pacific/Ponape	#= Pacific/Pohnpei
 Link	Pacific/Port_Moresby	Pacific/Truk	#= Pacific/Chuuk
diff --git a/backzone b/backzone
index b4ebd2e478c3..7803c57d095d 100644
--- a/backzone
+++ b/backzone
@@ -1,1805 +1,1858 @@
 # Zones that go back beyond the scope of the tz database
 
 # This file is in the public domain.
 
 # This file is by no means authoritative; if you think you know
 # better, go ahead and edit it (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
+# When proposing changes to this file, please use 'git format-patch'
+# format, either by attaching the resulting .patch file to your email,
+# or by using 'git send-email'.  This will help maintainers save time.
+
 
 # From Paul Eggert (2014-10-31):
 
 # This file contains data outside the normal scope of the tz database,
 # in that its zones do not differ from normal tz zones after 1970.
 # Links in this file point to zones in this file, superseding links in
 # the file 'backward'.
 
 # Although zones in this file may be of some use for analyzing
 # pre-1970 timestamps, they are less reliable, cover only a tiny
 # sliver of the pre-1970 era, and cannot feasibly be improved to cover
 # most of the era.  Because the zones are out of normal scope for the
 # database, less effort is put into maintaining this file.  Many of
 # the zones were formerly in other source files, but were removed or
 # replaced by links as their data entries were questionable and/or they
 # differed from other zones only in pre-1970 timestamps.
 
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 
 # This file is not intended to be compiled standalone, as it
 # assumes rules from other files.  In the tz distribution, use
 # 'make PACKRATDATA=backzone zones' to compile and install this file.
 
 
 # From Paul Eggert (2020-04-15):
 # The following remarks should be incorporated into this table sometime.
 # Patches in 'git format-patch' format would be welcome.
 #
 # From Phake Nick (2020-04-15):
 # ... the historical timezone data for those China zones seems to be
 # incorrect.  The transition to GMT+8 date given there for these zones
 # were 1980 which also contradict the file description that they do
 # not disagree with normal zone after 1970.  According to sources that
 # have also been cited in the asia file, except Xinjiang and Tibet,
 # they should have adopted the Beijing Time from around 1949/1950
 # depends on exactly when each of those cities were taken over by the
 # communist army.  And they should also follow the DST setting of
 # Asia/Shanghai after that point of time.  In addition,
 # http://gaz.ncl.edu.tw/detail.jsp?sysid=E1091792 the document from
 # Chongqing Nationalist government say in year 1945 all of China
 # should adopt summer time due to the war (not sure whether it
 # continued after WWII ends)(Probably only enforced in area under
 # their rule at the time?)  The Asia/Harbin's 1932 and 1940 entry
 # should also be incorrect.  As per sources recorded at
 # https://wiki.suikawiki.org/n/%E6%BA%80%E5%B7%9E%E5%9B%BD%E3%81%AE%E6%A8%99%E6%BA%96%E6%99%82
 # , in 1932 Harbin should have adopted UTC+8:00 instead of data
 # currently listed in the tz database according to official
 # announcement from Manchuko.  And they should have adopted GMT+9 in
 # 1937 January 1st according to official announcement at the time
 # being cited on the webpage.
 
 
 # Zones are sorted by zone name.  Each zone is preceded by the
 # name of the country that the zone is in, along with any other
 # commentary and rules associated with the entry.
 # If the zone overrides links in the main data, it
 # is followed by the corresponding Link lines.
 # If the zone overrides main-data links only when building with
 # PACKRATLIST=zone.tab, it is followed by a commented-out Link line
 # that starts with "#PACKRATLIST zone.tab".
 #
 # As explained in the zic man page, the zone columns are:
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # and the rule columns are:
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 
 
 # Ghana
 
 # From P Chan (2020-11-20):
 # Interpretation Amendment Ordinance, 1915 (No.24 of 1915) [1915-11-02]
 # Ordinances of the Gold Coast, Ashanti, Northern Territories 1915, p 69-71
 # https://books.google.com/books?id=ErA-AQAAIAAJ&pg=PA70
 # This Ordinance added "'Time' shall mean Greenwich Mean Time" to the
 # Interpretation Ordinance, 1876.
 #
 # Determination of the Time Ordinance, 1919 (No. 18 of 1919) [1919-11-24]
 # Ordinances of the Gold Coast, Ashanti, Northern Territories 1919, p 75-76
 # https://books.google.com/books?id=MbA-AQAAIAAJ&pg=PA75
 # This Ordinance removed the previous definition of time and introduced DST.
 #
 # Time Determination Ordinance (Cap. 214)
 # The Laws of the Gold Coast (including Togoland Under British Mandate)
 # Vol. II (1937), p 2328
 # https://books.google.com/books?id=Z7M-AQAAIAAJ&pg=PA2328
 # Revised edition of the 1919 Ordinance.
 #
 # Time Determination (Amendment) Ordinance, 1940 (No. 9 of 1940) [1940-04-06]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1940, p 22
 # https://books.google.com/books?id=1ao-AQAAIAAJ&pg=PA22
 # This Ordinance changed the forward transition from September to May.
 #
 # Defence (Time Determination Ordinance Amendment) Regulations, 1942
 # (Regulations No. 6 of 1942) [1942-01-31, commenced on 1942-02-08]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1942, p 48
 # https://books.google.com/books?id=Das-AQAAIAAJ&pg=PA48
 # These regulations advanced the [standard] time by thirty minutes.
 #
 # Defence (Time Determination Ordinance Amendment (No.2)) Regulations,
 # 1942 (Regulations No. 28 of 1942) [1942-04-25]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1942, p 87
 # https://books.google.com/books?id=Das-AQAAIAAJ&pg=PA87
 # These regulations abolished DST and changed the time to GMT+0:30.
 #
 # Defence (Revocation) (No.4) Regulations, 1945 (Regulations No. 45 of
 # 1945) [1945-10-24, commenced on 1946-01-06]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1945, p 256
 # https://books.google.com/books?id=9as-AQAAIAAJ&pg=PA256
 # These regulations revoked the previous two sets of Regulations.
 #
 # Time Determination (Amendment) Ordinance, 1945 (No. 18 of 1945) [1946-01-06]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1945, p 69
 # https://books.google.com/books?id=9as-AQAAIAAJ&pg=PA69
 # This Ordinance abolished DST.
 #
 # Time Determination (Amendment) Ordinance, 1950 (No. 26 of 1950) [1950-07-22]
 # Annual Volume of the Laws of the Gold Coast:
 # Containing All Legislation Enacted During Year 1950, p 35
 # https://books.google.com/books?id=e60-AQAAIAAJ&pg=PA35
 # This Ordinance restored DST but with thirty minutes offset.
 #
 # Time Determination Ordinance (Cap. 264)
 # The Laws of the Gold Coast, Vol. V (1954), p 380
 # https://books.google.com/books?id=Mqc-AQAAIAAJ&pg=PA380
 # Revised edition of the Time Determination Ordinance.
 #
 # Time Determination (Amendment) Ordinance, 1956 (No. 21 of 1956) [1956-08-29]
 # Annual Volume of the Ordinances of the Gold Coast Enacted During the
 # Year 1956, p 83
 # https://books.google.com/books?id=VLE-AQAAIAAJ&pg=PA83
 # This Ordinance abolished DST.
 
 Rule	Ghana	1919	only	-	Nov	24	0:00	0:20	+0020
 Rule	Ghana	1920	1942	-	Jan	 1	2:00	0	GMT
 Rule	Ghana	1920	1939	-	Sep	 1	2:00	0:20	+0020
 Rule	Ghana	1940	1941	-	May	 1	2:00	0:20	+0020
 Rule	Ghana	1950	1955	-	Sep	 1	2:00	0:30	+0030
 Rule	Ghana	1951	1956	-	Jan	 1	2:00	0	GMT
 
 Zone	Africa/Accra	-0:00:52 -	LMT	1915 Nov  2
 			 0:00	Ghana	%s	1942 Feb  8
 			 0:30	-	+0030	1946 Jan  6
 			 0:00	Ghana	%s
 
 # Ethiopia
 # From Paul Eggert (2014-07-31):
 # Like the Swahili of Kenya and Tanzania, many Ethiopians keep a
 # 12-hour clock starting at our 06:00, so their "8 o'clock" is our
 # 02:00 or 14:00.  Keep this in mind when you ask the time in Amharic.
 #
 # Shanks & Pottenger write that Ethiopia had six narrowly-spaced time
 # zones between 1870 and 1890, that they merged to 38E50 (2:35:20) in
 # 1890, and that they switched to 3:00 on 1936-05-05.  Perhaps 38E50
 # was for Adis Dera.  Quite likely the Shanks data entries are wrong
 # anyway.
 Zone Africa/Addis_Ababa	2:34:48 -	LMT	1870
 			2:35:20	-	ADMT	1936 May  5 # Adis Dera MT
 			3:00	-	EAT
 
 # Eritrea
 Zone	Africa/Asmara	2:35:32 -	LMT	1870
 			2:35:32	-	AMT	1890        # Asmara Mean Time
 			2:35:20	-	ADMT	1936 May  5 # Adis Dera MT
 			3:00	-	EAT
 Link Africa/Asmara Africa/Asmera
 
 # Mali (southern)
 Zone	Africa/Bamako	-0:32:00 -	LMT	1912
 			 0:00	-	GMT	1934 Feb 26
 			-1:00	-	-01	1960 Jun 20
 			 0:00	-	GMT
 #PACKRATLIST zone.tab Link Africa/Bamako Africa/Timbuktu
 
 # Central African Republic
 Zone	Africa/Bangui	1:14:20	-	LMT	1912
 			1:00	-	WAT
 
 # The Gambia
 # From P Chan (2020-12-09):
 # Standard time of GMT-1 was adopted on 1933-04-01.  On 1942-02-01, GMT was
 # adopted as a war time measure.  This was made permanent in 1946.
 #
 # Interpretation Ordinance, 1914 (No. 12 of 1914) [1914-09-29]
 # Interpretation Ordinance, 1933 (No. 10 of 1933) [1933-03-31]
 # Notice No. 5 of 1942, Colony of the Gambia Government Gazette, Vol. LIX,
 # No.2, 1942-01-15, p 2
 # Interpretation (Amendment) Ordinance, 1946 (No. 3 of 1946) [1946-07-15]
 Zone	Africa/Banjul	-1:06:36 -	LMT	1912
 			-1:06:36 -	BMT	1933 Apr  1 # Banjul Mean Time
 			-1:00	-	-01	1942 Feb  1  0:00
 			 0:00	-	GMT
 
 # Malawi
 # From P Chan (2020-12-09):
 # In 1911, Zomba mean time was adopted as the legal time of Nyasaland.  In
 # 1914, Zomba mean time switched from GMT+2:21:10 to GMT+2:21. On 1925-07-01,
 # GMT+2 was adopted.
 #
 # Interpretation and General Clauses Ordinance, 1911 (No. 12 of 1911)
 # [1911-07-24]
 # Notice No. 124 of 1914, 1914-06-30, The Nyasaland Government Gazette, Vol.
 # XXI, No. 8, 1914-06-30, p 122
 # Interpretation and General Clauses (Amendment) Ordinance, 1925 (No. 3 of
 # 1925) [1925-04-02]
 Zone	Africa/Blantyre	2:20:00 -	LMT	1911 Jul 24
 			2:21:10	-	ZMT	1914 Jun 30 # Zomba Mean Time
 			2:21	-	ZMT	1925 Jul  1
 			2:00	-	CAT
 
 # Republic of the Congo
 Zone Africa/Brazzaville	1:01:08 -	LMT	1912
 			1:00	-	WAT
 
 # Burundi
 Zone Africa/Bujumbura	1:57:28	-	LMT	1890
 			2:00	-	CAT
 
 # Guinea
 Zone	Africa/Conakry	-0:54:52 -	LMT	1912
 			 0:00	-	GMT	1934 Feb 26
 			-1:00	-	-01	1960
 			 0:00	-	GMT
 
 # Senegal
 Zone	Africa/Dakar	-1:09:44 -	LMT	1912
 			-1:00	-	-01	1941 Jun
 			 0:00	-	GMT
 
 # Tanzania
 Zone Africa/Dar_es_Salaam 2:37:08 -	LMT	1931
 			3:00	-	EAT	1948
 			2:45	-	+0245	1961
 			3:00	-	EAT
 
 # Djibouti
 Zone	Africa/Djibouti	2:52:36 -	LMT	1911 Jul
 			3:00	-	EAT
 
 # Cameroon
 # Whitman says they switched to 1:00 in 1920; go with Shanks & Pottenger.
 Zone	Africa/Douala	0:38:48	-	LMT	1912
 			1:00	-	WAT
 # Sierra Leone
 # From P Chan (2020-12-09):
 # Standard time of GMT-1 was adopted on 1913-07-01.  Twenty minutes of DST was
 # introduce[d] in 1932 and was suspended in 1939.  In 1941, GMT was adopted by
 # Defence Regulations.  This was made permanent in 1946.
 #
 # Government Notice No. 121 of 1913, 1913-06-06, Sierra Leone Royal Gazette,
 # Vol. XLIV, No. 1384, 1913-06-14, p 347
 # Alteration of Time Ordinance, 1932 (No. 34 of 1932) [1932-12-01]
 # Alteration of Time (Amendment) Ordinance, 1938 (No. 25 of 1938) [1938-11-24]
 # Defence Regulations (No. 9), 1939 (Regulations No. 9 of 1939), 1939-09-05
 # Defence Regulations (No. 11), 1939 (Regulations No. 11 of 1939), 1939-09-27
 # Defence (Amendment) (No. 17) Regulations, 1941 (Public Notice No. 157 of
 # 1941), 1914-12-04
 # Alteration of Time (Amendment) Ordinance, 1946 (No. 2 of 1946) [1946-02-07]
 
 # From Tim Parenti (2021-03-02), per P Chan (2021-02-25):
 # For Sierra Leone in 1957-1962, the standard time was defined in the
 # Alteration of Time Ordinance, 1932 (as amended in 1946, renamed to Local Time
 # Ordinance in 1960 and Local Time Act in 1961). It was unamended throughout
 # that period.  See references to "Time" in the Alphabetical Index of the
 # Legislation in force on the 31st day of December,
 #   1957: https://books.google.com/books?id=lvQ-AQAAIAAJ&pg=RA2-PA49
 #   1958: https://books.google.com/books?id=4fQ-AQAAIAAJ&pg=RA2-PA50
 #   1959: https://books.google.com/books?id=p_U-AQAAIAAJ&pg=RA2-PA55
 #   1960: https://books.google.com/books?id=JPY-AQAAIAAJ&pg=RA3-PA37
 #   1961: https://books.google.com/books?id=7vY-AQAAIAAJ&pg=RA3-PA41
 #   1962: https://books.google.com/books?id=W_c-AQAAIAAJ&pg=RA3-PA44
 #   1963: https://books.google.com/books?id=9vk-AQAAIAAJ&pg=RA1-PA47
 #
 # Although Shanks & Pottenger had DST from Jun 1 00:00 to Sep 1 00:00 in this
 # period, many contemporaneous almanacs agree that it wasn't used:
 # https://mm.icann.org/pipermail/tz/2021-February/029866.html
 # Go with the above.
 
 Rule	SL	1932	only	-	Dec	 1	 0:00	0:20	-0040
 Rule	SL	1933	1938	-	Mar	31	24:00	0	-01
 Rule	SL	1933	1939	-	Aug	31	24:00	0:20	-0040
 Rule	SL	1939	only	-	May	31	24:00	0	-01
 
 Zone	Africa/Freetown	-0:53:00 -	LMT	1882
 			-0:53:00 -	FMT	1913 Jul  1 # Freetown MT
 			-1:00	SL	%s	1939 Sep  5
 			-1:00	-	-01	1941 Dec  6 24:00
 			 0:00	-	GMT
 
 # Botswana
 # From Paul Eggert (2013-02-21):
 # Milne says they were regulated by the Cape Town Signal in 1899;
 # assume they switched to 2:00 when Cape Town did.
 Zone	Africa/Gaborone	1:43:40 -	LMT	1885
 			1:30	-	SAST	1903 Mar
 			2:00	-	CAT	1943 Sep 19  2:00
 			2:00	1:00	CAST	1944 Mar 19  2:00
 			2:00	-	CAT
 
 # Zimbabwe
 Zone	Africa/Harare	2:04:12 -	LMT	1903 Mar
 			2:00	-	CAT
 
 # Uganda
 Zone	Africa/Kampala	2:09:40 -	LMT	1928 Jul
 			3:00	-	EAT	1930
 			2:30	-	+0230	1948
 			2:45	-	+0245	1957
 			3:00	-	EAT
 
 # Rwanda
 Zone	Africa/Kigali	2:00:16 -	LMT	1935 Jun
 			2:00	-	CAT
 
 # Democratic Republic of the Congo (west)
 Zone Africa/Kinshasa	1:01:12 -	LMT	1897 Nov  9
 			1:00	-	WAT
 
 # Gabon
 Zone Africa/Libreville	0:37:48 -	LMT	1912
 			1:00	-	WAT
 
 # Togo
 Zone	Africa/Lome	0:04:52 -	LMT	1893
 			0:00	-	GMT
 
 # Angola
 #
 # From Paul Eggert (2018-02-16):
 # Shanks gives 1911-05-26 for the transition to WAT,
 # evidently confusing the date of the Portuguese decree
 # (see Europe/Lisbon) with the date that it took effect.
 #
 Zone	Africa/Luanda	0:52:56	-	LMT	1892
 			0:52:04	-	LMT	1911 Dec 31 23:00u # Luanda MT?
 			1:00	-	WAT
 
 # Democratic Republic of the Congo (east)
 #
 # From Alois Treindl (2022-02-28):
 # My main source for its time zone history is
 # Henri le Corre, Régimes horaires pour l'Europe et l'Afrique.
 # Shanks follows le Corre.  As does Françoise Schneider-Gauquelin in her book
 # Problèmes de l'heure résolus pour le monde entier.
 #
 Zone Africa/Lubumbashi	1:49:52 -	LMT	1897 Nov  9
 			1:00	-	WAT	1920 Apr 25
 			2:00	-	CAT
 
 # Zambia
 Zone	Africa/Lusaka	1:53:08 -	LMT	1903 Mar
 			2:00	-	CAT
 
 # Equatorial Guinea
 #
 # Although Shanks says that Malabo switched from UT +00 to +01 on 1963-12-15,
 # a Google Books search says that London Calling, Issues 432-465 (1948), p 19,
 # says that Spanish Guinea was at +01 back then.  The Shanks data entries
 # are most likely wrong, but we have nothing better; use them here for now.
 #
 Zone	Africa/Malabo	0:35:08 -	LMT	1912
 			0:00	-	GMT	1963 Dec 15
 			1:00	-	WAT
 
 # Lesotho
 Zone	Africa/Maseru	1:50:00 -	LMT	1903 Mar
 			2:00	-	SAST	1943 Sep 19  2:00
 			2:00	1:00	SAST	1944 Mar 19  2:00
 			2:00	-	SAST
 
 # Eswatini (formerly Swaziland)
 Zone	Africa/Mbabane	2:04:24 -	LMT	1903 Mar
 			2:00	-	SAST
 
 # Somalia
 Zone Africa/Mogadishu	3:01:28 -	LMT	1893 Nov
 			3:00	-	EAT	1931
 			2:30	-	+0230	1957
 			3:00	-	EAT
 
 # Niger
 Zone	Africa/Niamey	 0:08:28 -	LMT	1912
 			-1:00	-	-01	1934 Feb 26
 			 0:00	-	GMT	1960
 			 1:00	-	WAT
 
 # Mauritania
 Zone Africa/Nouakchott	-1:03:48 -	LMT	1912
 			 0:00	-	GMT	1934 Feb 26
 			-1:00	-	-01	1960 Nov 28
 			 0:00	-	GMT
 
 # Burkina Faso
 Zone Africa/Ouagadougou	-0:06:04 -	LMT	1912
 			 0:00	-	GMT
 
 # Benin
 # Whitman says they switched to 1:00 in 1946, not 1934;
 # go with Shanks & Pottenger.
 Zone Africa/Porto-Novo	0:10:28	-	LMT	1912 Jan  1
 			0:00	-	GMT	1934 Feb 26
 			1:00	-	WAT
 
 # Mali (northern)
 Zone	Africa/Timbuktu	-0:12:04 -	LMT	1912
 			 0:00	-	GMT
 
 # Anguilla
 Zone America/Anguilla	-4:12:16 -	LMT	1912 Mar  2
 			-4:00	-	AST
 
 # Antigua and Barbuda
 Zone	America/Antigua	-4:07:12 -	LMT	1912 Mar 2
 			-5:00	-	EST	1951
 			-4:00	-	AST
 
 # Chubut, Argentina
 # The name "Comodoro Rivadavia" exceeds the 14-byte POSIX limit.
 Zone America/Argentina/ComodRivadavia -4:30:00 - LMT	1894 Oct 31
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  3
 			-4:00	-	-04	1991 Oct 20
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 Jun  1
 			-4:00	-	-04	2004 Jun 20
 			-3:00	-	-03
 
 # Aruba
 Zone	America/Aruba	-4:40:24 -	LMT	1912 Feb 12 # Oranjestad
 			-4:30	-	-0430	1965
 			-4:00	-	AST
 
 # Atikokan, Ontario
 
 # From Paul Eggert (1997-10-17):
 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
 # says that Atikokan, Ontario currently does not observe DST,
 # but will vote on 11-10 whether to use EST/EDT.
 # He also writes that the Ontario Time Act (1990, Chapter T.9)
 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
 # Officially Atikokan is therefore on CST/CDT, and most likely this report
 # concerns a non-official time observed as a matter of local practice.
 #
 # From Paul Eggert (2000-10-02):
 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
 # New Osnaburgh observe CST all year, that Big Trout Lake observes
 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
 # violation of the official Ontario rules.
 #
 # From Paul Eggert (2006-07-09):
 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
 # 2005-07-21 Chronicle-Journal, which said:
 #
 #	The clocks in Atikokan stay set on standard time year-round.
 #	This means they spend about half the time on central time and
 #	the other half on eastern time.
 #
 #	For the most part, the system works, Mayor Dennis Brown said.
 #
 #	"The majority of businesses in Atikokan deal more with Eastern
 #	Canada, but there are some that deal with Western Canada," he
 #	said.  "I don't see any changes happening here."
 #
 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
 # [New Osnaburgh] follow the same practice."
 
 # From Garry McKinnon (2006-07-14) via Chris Walton:
 # I chatted with a member of my board who has an outstanding memory
 # and a long history in Atikokan (and in the telecom industry) and he
 # can say for certain that Atikokan has been practicing the current
 # time keeping since 1952, at least.
 
 # From Paul Eggert (2006-07-17):
 # Shanks & Pottenger say that Atikokan has agreed with Rainy River
 # ever since standard time was introduced, but the information from
 # McKinnon sounds more authoritative.  For now, assume that Atikokan
 # switched to EST immediately after WWII era daylight saving time
 # ended.  This matches the old (less-populous) America/Coral_Harbour
 # entry since our cutoff date of 1970, so we can move
 # America/Coral_Harbour to the 'backward' file.
 
 Zone America/Atikokan	-6:06:28 -	LMT	1895
 			-6:00	Canada	C%sT	1940 Sep 29
 			-6:00	1:00	CDT	1942 Feb  9  2:00s
 			-6:00	Canada	C%sT	1945 Sep 30  2:00
 			-5:00	-	EST
 #PACKRATLIST zone.tab Link America/Atikokan America/Coral_Harbour
 
 # Quebec east of Natashquan
 
 # From Paul Eggert (2021-05-09):
 # H. David Matthews and Mary Vincent's map
 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
 # says that Quebec east of the -63 meridian is supposed to observe
 # AST, but residents as far east as Natashquan use EST/EDT, and
 # residents east of Natashquan use AST.
 # The Quebec department of justice writes in
 # "The situation in Minganie and Basse-Côte-Nord"
 # https://www.justice.gouv.qc.ca/en/department/ministre/functions-and-responsabilities/legal-time-in-quebec/the-situation-in-minganie-and-basse-cote-nord/
 # that the coastal strip from just east of Natashquan to Blanc-Sablon
 # observes Atlantic standard time all year round.
 # This common practice was codified into law as of 2007; see Legal Time Act,
 # CQLR c T-5.1 .
 # For lack of better info, guess this practice began around 1970, contra to
 # Shanks & Pottenger who have this region observing AST/ADT.
 
 Zone America/Blanc-Sablon -3:48:28 -	LMT	1884
 			-4:00	Canada	A%sT	1970
 			-4:00	-	AST
 
 # Cayman Is
 Zone	America/Cayman	-5:25:32 -	LMT	1890     # Georgetown
 			-5:07:10 -	KMT	1912 Feb # Kingston Mean Time
 			-5:00	-	EST
 
 # United States
 #
 # From Paul Eggert (2018-03-18):
 # America/Chillicothe would be tricky, as it was a city of two-timers:
 # "To prevent a constant mixup at Chillicothe, caused by the courthouse
 #  clock running on central time and the city running on 'daylight saving'
 #  time, a third hand was added to the dial of the courthouse clock."
 # -- Ohio news in brief. The Cedarville Herald. 1920-05-21;43(21):1 (col. 5)
 # https://digitalcommons.cedarville.edu/cedarville_herald/794
 
 # Canada
 Zone America/Coral_Harbour -5:32:40 -	LMT	1884
 			-5:00	NT_YK	E%sT	1946
 			-5:00	-	EST
 
 # From Chris Walton (2011-12-01):
 # There are two areas within the Canadian province of British Columbia
 # that do not currently observe daylight saving:
 # a) The Creston Valley (includes the town of Creston and surrounding area)
 # b) The eastern half of the Peace River Regional District
 # (includes the cities of Dawson Creek and Fort St. John)
 
 # Earlier this year I stumbled across a detailed article about the time
 # keeping history of Creston; it was written by Tammy Hardwick who is the
 # manager of the Creston & District Museum. The article was written in May 2009.
 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
 # According to the article, Creston has not changed its clocks since June 1918.
 # i.e. Creston has been stuck on UT-7 for 93 years.
 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
 
 # Unfortunately the exact date for the time change in June 1918 remains
 # unknown and will be difficult to ascertain.  I e-mailed Tammy a few months
 # ago to ask if Sunday June 2 was a reasonable guess.  She said it was just
 # as plausible as any other date (in June).  She also said that after writing
 # the article she had discovered another time change in 1916; this is the
 # subject of another article which she wrote in October 2010.
 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
 
 # Here is a summary of the three clock change events in Creston's history:
 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
 # Exact date unknown
 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
 # note 1:
 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
 # Creston did not change its clocks.
 # note 2:
 # During WWII when the Federal Government legislated a mandatory clock change,
 # Creston did not oblige.
 # note 3:
 # There is no guarantee that Creston will remain on Mountain Standard Time
 # (UTC-7) forever.
 # The subject was debated at least once this year by the town Council.
 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
 
 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
 # summer time to cause the offset to be -7:00, the same as it had been before
 # the change.  It can be argued that the timezone abbreviation during this
 # period should be PDT rather than MST, but that doesn't seem important enough
 # (to anyone) to further complicate the rules.
 
 # The transition dates (and times) are guesses.
 
 Zone America/Creston	-7:46:04 -	LMT	1884
 			-7:00	-	MST	1916 Oct 1
 			-8:00	-	PST	1918 Jun 2
 			-7:00	-	MST
 
 # Curaçao
 # Milne gives 4:35:46.9 for Curaçao mean time; round to nearest.
 #
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
 # -4:00 since standard time was introduced on 1912-03-02; and that
 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
 # 1912-02-02 to 1965-01-01.  The former is dubious, since S&P also say
 # Saba Island has been like Curaçao.
 # This all predates our 1970 cutoff, though.
 #
 # By July 2007 Curaçao and St Maarten are planned to become
 # associated states within the Netherlands, much like Aruba;
 # Bonaire, Saba and St Eustatius would become directly part of the
 # Netherlands as Kingdom Islands.  This won't affect their time zones
 # though, as far as we know.
 #
 Zone	America/Curacao	-4:35:47 -	LMT	1912 Feb 12 # Willemstad
 			-4:30	-	-0430	1965
 			-4:00	-	AST
 Link	America/Curacao	America/Kralendijk
 Link	America/Curacao	America/Lower_Princes
 
 # Dominica
 Zone America/Dominica	-4:05:36 -	LMT	1911 Jul  1  0:01 # Roseau
 			-4:00	-	AST
 
 # Baja California
 # See 'northamerica' for why this entry is here rather than there.
 Zone America/Ensenada	-7:46:28 -	LMT	1922 Jan  1  0:13:32
 			-8:00	-	PST	1927 Jun 10 23:00
 			-7:00	-	MST	1930 Nov 16
 			-8:00	-	PST	1942 Apr
 			-7:00	-	MST	1949 Jan 14
 			-8:00	-	PST	1996
 			-8:00	Mexico	P%sT
 
 # Grenada
 Zone	America/Grenada	-4:07:00 -	LMT	1911 Jul # St George's
 			-4:00	-	AST
 
 # Guadeloupe
 Zone America/Guadeloupe	-4:06:08 -	LMT	1911 Jun  8 # Pointe-à-Pitre
 			-4:00	 -	AST
 
 
 # Canada
 #
 # From Paul Eggert (2015-03-24):
 # Since 1970 most of Quebec has been like Toronto; see
 # America/Toronto.  However, earlier versions of the tz database
 # mistakenly relied on data from Shanks & Pottenger saying that Quebec
 # differed from Ontario after 1970, and the following rules and zone
 # were created for most of Quebec from the incorrect Shanks &
 # Pottenger data.  The post-1970 entries have been corrected, but the
 # pre-1970 entries are unchecked and probably have errors.
 #
 Rule	Mont	1917	only	-	Mar	25	2:00	1:00	D
 Rule	Mont	1917	only	-	Apr	24	0:00	0	S
 Rule	Mont	1919	only	-	Mar	31	2:30	1:00	D
 Rule	Mont	1919	only	-	Oct	25	2:30	0	S
 Rule	Mont	1920	only	-	May	 2	2:30	1:00	D
 Rule	Mont	1920	1922	-	Oct	Sun>=1	2:30	0	S
 Rule	Mont	1921	only	-	May	 1	2:00	1:00	D
 Rule	Mont	1922	only	-	Apr	30	2:00	1:00	D
 Rule	Mont	1924	only	-	May	17	2:00	1:00	D
 Rule	Mont	1924	1926	-	Sep	lastSun	2:30	0	S
 Rule	Mont	1925	1926	-	May	Sun>=1	2:00	1:00	D
 Rule	Mont	1927	1937	-	Apr	lastSat	24:00	1:00	D
 Rule	Mont	1927	1937	-	Sep	lastSat	24:00	0	S
 Rule	Mont	1938	1940	-	Apr	lastSun	0:00	1:00	D
 Rule	Mont	1938	1939	-	Sep	lastSun	0:00	0	S
 Rule	Mont	1946	1973	-	Apr	lastSun	2:00	1:00	D
 Rule	Mont	1945	1948	-	Sep	lastSun	2:00	0	S
 Rule	Mont	1949	1950	-	Oct	lastSun	2:00	0	S
 Rule	Mont	1951	1956	-	Sep	lastSun	2:00	0	S
 Rule	Mont	1957	1973	-	Oct	lastSun	2:00	0	S
 Zone America/Montreal	-4:54:16 -	LMT	1884
 			-5:00	Mont	E%sT	1918
 			-5:00	Canada	E%sT	1919
 			-5:00	Mont	E%sT	1942 Feb  9  2:00s
 			-5:00	Canada	E%sT	1946
 			-5:00	Mont	E%sT	1974
 			-5:00	Canada	E%sT
 
 # Montserrat
 # From Paul Eggert (2006-03-22):
 # In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
 # world.gazetteer.com says Cork Hill is the most populous location now.
 Zone America/Montserrat	-4:08:52 -	LMT	1911 Jul  1  0:01 # Cork Hill
 			-4:00	-	AST
 
 # The Bahamas
 #
 # For 1899 Milne gives -5:09:29.5; round that.
 #
 # From P Chan (2020-11-27, corrected on 2020-12-02):
 # There were two periods of DST observed in 1942-1945: 1942-05-01
 # midnight to 1944-12-31 midnight and 1945-02-01 to 1945-10-17 midnight.
 # "midnight" should mean 24:00 from the context.
 #
 # War Time Order 1942 [1942-05-01] and War Time (No. 2) Order 1942  [1942-09-29]
 # Appendix to the Statutes of 7 George VI. and the Year 1942. p 34, 43
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA34
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA43
 #
 # War Time Order 1943 [1943-03-31] and War Time Order 1944 [1943-12-29]
 # Appendix to the Statutes of 8 George VI. and the Year 1943. p 9-10, 28-29
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA9
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA28
 #
 # War Time Order 1945 [1945-01-31] and the Order which revoke War Time Order
 # 1945 [1945-10-16] Appendix to the Statutes of 9 George VI. and the Year
 # 1945. p 160, 247-248
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA160
 # https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA247
 #
 # From Sue Williams (2006-12-07):
 # The Bahamas announced about a month ago that they plan to change their DST
 # rules to sync with the U.S. starting in 2007....
 # http://www.jonesbahamas.com/?c=45&a=10412
 
 Rule	Bahamas	1942	only	-	May	 1	24:00	1:00	W
 Rule	Bahamas	1944	only	-	Dec	31	24:00	0	S
 Rule	Bahamas	1945	only	-	Feb	 1	0:00	1:00	W
 Rule	Bahamas	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Bahamas	1945	only	-	Oct	17	24:00	0	S
 Rule	Bahamas	1964	1975	-	Oct	lastSun	2:00	0	S
 Rule	Bahamas	1964	1975	-	Apr	lastSun	2:00	1:00	D
 
 Zone	America/Nassau	-5:09:30 -	LMT	1912 Mar 2
 			-5:00	Bahamas	E%sT	1976
 			-5:00	US	E%sT
 
 # Canada
 # From Chris Walton (2022-10-15):
 # I would also like to see America/Nipigon and America/Rainy_River converted
 # into link entries because I have zero faith in the current Shanks based data.
 # From Paul Eggert (2022-10-15):
 # These are now links in the primary data.  Also see America/Thunder_Bay.
 Zone America/Nipigon	-5:53:04 -	LMT	1895
 			-5:00	Canada	E%sT	1940 Sep 29
 			-5:00	1:00	EDT	1942 Feb  9  2:00s
 			-5:00	Canada	E%sT
 
+# From Rives McDow (1999-11-08):
+# On October 31, when the rest of Nunavut went to Central time,
+# Pangnirtung wobbled.  Here is the result of their wobble:
+#
+# The following businesses and organizations in Pangnirtung use Central Time:
+#
+#	First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
+#	Eastern Arctic National Parks, A & D Specialist
+#
+# The following businesses and organizations in Pangnirtung use Eastern Time:
+#
+#	Hamlet office, All other businesses, Both schools, Airport operator
+#
+# This has made for an interesting situation there, which warranted the news.
+# No one there that I spoke with seems concerned, or has plans to
+# change the local methods of keeping time, as it evidently does not
+# really interfere with any activities or make things difficult locally.
+# They plan to celebrate New Year's turn-over twice, one hour apart,
+# so it appears that the situation will last at least that long.
+# The Nunavut Intergovernmental Affairs hopes that they will "come to
+# their senses", but the locals evidently don't see any problem with
+# the current state of affairs.
+
+# From Michaela Rodrigue, writing in the
+# Nunatsiaq News (1999-11-19):
+# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html
+# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
+# central - or Nunavut time - for government offices, and eastern time
+# for municipal offices and schools....  Igloolik [was similar but then]
+# made the switch to central time on Saturday, Nov. 6.
+
+# From Chris Walton (2022-11-06):
+# The implication is that Pangnirtung and Qikiqtarjuaq have observed Eastern
+# Time as far back as 1984 (and likely even further back than that).
+# It is possible that these communities never actually observed Atlantic
+# Time, but that would be difficult to prove.
+# From Paul Eggert (2022-11-06):
+# This is in 'backzone' as we have no good evidence that Pangnirtung differs
+# from America/Iqaluit since 1970.  A Google Books snippet view of
+# volume 2, page 186 of "Pilot of Arctic Canada", published 1959 by
+# the Canadian Hydrographic Service, suggests (though does not state)
+# that Pangnirtung observed EST then.
+#
+# aka Panniqtuuq
+Zone America/Pangnirtung 0	-	-00	1921 # trading post est.
+			-5:00	NT_YK	E%sT	1999 Oct 31  2:00
+			-6:00	Canada	C%sT	2000 Oct 29  2:00
+			-5:00	Canada	E%sT
+
 # United States
 #
 # From Paul Eggert (2018-03-18):
 # America/Palm_Springs would be tricky, as it kept two sets of clocks
 # in 1946/7.  See the following notes.
 #
 # From Steve Allen (2018-01-19):
 # The shadow of Mt. San Jacinto brings darkness very early in the winter
 # months.  In 1946 the chamber of commerce decided to put the clocks of Palm
 # Springs forward by an hour in the winter.
 # https://www.desertsun.com/story/life/2017/12/27/palm-springs-struggle-daylight-savings-time-and-idea-sun-time/984416001/
 # Desert Sun, Number 18, 1 November 1946
 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19461101
 # has proposal for meeting on front page and page 21.
 # Desert Sun, Number 19, 5 November 1946
 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19461105
 # reports that Sun Time won at the meeting on front page and page 5.
 # Desert Sun, Number 37, 7 January 1947
 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19470107.2.12
 # front page reports request to abandon Sun Time and page 7 notes a "class war".
 # Desert Sun, Number 38, 10 January 1947
 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=DS19470110
 # front page reports on end.
 
 # Trinidad and Tobago
 Zone America/Port_of_Spain -4:06:04 -	LMT	1912 Mar 2
 			-4:00	-	AST
 Link America/Port_of_Spain America/Marigot
 Link America/Port_of_Spain America/St_Barthelemy
 
 # Canada
 # From Chris Walton (2022-10-15):
 # I would also like to see America/Nipigon and America/Rainy_River converted
 # into link entries because I have zero faith in the current Shanks based data.
 # From Paul Eggert (2022-10-15):
 # These are now links in the primary data.  Also see America/Thunder_Bay.
 Zone America/Rainy_River -6:18:16 -	LMT	1895
 			-6:00	Canada	C%sT	1940 Sep 29
 			-6:00	1:00	CDT	1942 Feb  9  2:00s
 			-6:00	Canada	C%sT
 
 # Argentina
 # This entry was intended for the following areas, but has been superseded by
 # more detailed zones.
 # Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
 # Formosa (FM), La Pampa (LP), Chubut (CH)
 Zone America/Rosario	-4:02:40 -	LMT	1894 Nov
 			-4:16:44 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Jul
 			-3:00	-	-03	1999 Oct  3  0:00
 			-4:00	Arg	-04/-03	2000 Mar  3  0:00
 			-3:00	-	-03
 
 # St Kitts-Nevis
 Zone America/St_Kitts	-4:10:52 -	LMT	1912 Mar  2 # Basseterre
 			-4:00	-	AST
 
 # St Lucia
 Zone America/St_Lucia	-4:04:00 -	LMT	1890 # Castries
 			-4:04:00 -	CMT	1912 # Castries Mean Time
 			-4:00	-	AST
 
 # US Virgin Is
 Zone America/St_Thomas	-4:19:44 -	LMT	1911 Jul # Charlotte Amalie
 			-4:00	-	AST
 Link America/St_Thomas America/Virgin
 
 # St Vincent and the Grenadines
 Zone America/St_Vincent	-4:04:56 -	LMT	1890 # Kingstown
 			-4:04:56 -	KMT	1912 # Kingstown Mean Time
 			-4:00	-	AST
 
 # Canada
 #
 # From Paul Eggert (2003-07-27):
 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
 # Port Arthur, Ontario, the principle of the Bill has been in
 # operation for the past three years, and in the City of Moose Jaw,
 # Saskatchewan, for one year."
 #
 # From David Bryan via Tory Tronrud, Director/Curator,
 # Thunder Bay Museum (2003-11-12):
 # There is some suggestion, however, that, by-law or not, daylight
 # savings time was being practiced in Fort William and Port Arthur
 # before 1909.... [I]n 1910, the line between the Eastern and Central
 # Time Zones was permanently moved about two hundred miles west to
 # include the Thunder Bay area....  When Canada adopted daylight
 # savings time in 1916, Fort William and Port Arthur, having done so
 # already, did not change their clocks....  During the Second World
 # War,... [t]he cities agreed to implement DST during the summer
 # months for the remainder of the war years.
 #
 # From Jeffery Nichols (2020-02-06):
 # According to the [Shanks] atlas, those western Ontario zones are huge,
 # covering most of Ontario northwest of Sault Ste Marie and Timmins.
 # The zones seem to include towns bigger than the ones they're named after,
 # like Dryden in America/Rainy_River and Wawa (and maybe Attawapiskat) in
 # America/Nipigon.  I assume it's too much trouble to change the name of the
 # zone (like when you found out that America/Glace_Bay includes Sydney, Nova
 # Scotia)....
 #
 # From Chris Walton (2022-10-15):
 # The TZ database currently shows that Thunder Bay has observed daylight
 # saving every year from 1970 onwards with the exception of 1973.
 # Back in July I raised some doubts on this mailing list about the 1973 data.
 # I now have more proof that it is wrong.
 # [attached Chronicle-Journal front pages, 1973-04-28 and 1973-10-27]
 #
 # From Paul Eggert (2022-10-15):
 # This is now a link in the primary data.  The following entry is
 # from Shanks & Pottenger, with corrections as noted above.
 #
 Zone America/Thunder_Bay -5:57:00 -	LMT	1895
 			-6:00	-	CST	1910
 			-5:00	-	EST	1942
 			-5:00	Canada	E%sT	1970
 			-5:00	Toronto	E%sT	1974
 			-5:00	Canada	E%sT
 
 # British Virgin Is
 Zone America/Tortola	-4:18:28 -	LMT	1911 Jul # Road Town
 			-4:00	-	AST
 
 # Dumont d'Urville, Île des Pétrels, -6640+14001, since 1956-11
 #  (2005-12-05)
 #
 # Another base at Port-Martin, 50km east, began operation in 1947.
 # It was destroyed by fire on 1952-01-14.
 #
 Zone Antarctica/DumontDUrville 0 -	-00	1947
 			10:00	-	+10	1952 Jan 14
 			0	-	-00	1956 Nov
 			10:00	-	+10
 
 # McMurdo, Ross Island, since 1955-12
 Zone Antarctica/McMurdo	0	-	-00	1956
 			12:00	NZ	NZ%sT
 Link Antarctica/McMurdo Antarctica/South_Pole
 
 # Syowa, Antarctica
 #
 # From Hideyuki Suzuki (1999-02-06):
 # In all Japanese stations, +0300 is used as the standard time.
 #
 # Syowa station, which is the first antarctic station of Japan,
 # was established on 1957-01-29.  Since Syowa station is still the main
 # station of Japan, it's appropriate for the principal location.
 # See:
 # NIPR Antarctic Research Activities (1999-08-17)
 # http://www.nipr.ac.jp/english/ara01.html
 Zone Antarctica/Syowa	0	-	-00	1957 Jan 29
 			3:00	-	+03
 
 # Vostok, Antarctica
 #
 # Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11
 # From Craig Mundell (1994-12-15):
 # http://quest.arc.nasa.gov/antarctica/QA/computers/Directions,Time,ZIP
 # Vostok, which is one of the Russian stations, is set on the same
 # time as Moscow, Russia.
 #
 # From Lee Hotz (2001-03-08):
 # I queried the folks at Columbia who spent the summer at Vostok and this is
 # what they had to say about time there:
 # "in the US Camp (East Camp) we have been on New Zealand (McMurdo)
 # time, which is 12 hours ahead of GMT. The Russian Station Vostok was
 # 6 hours behind that (although only 2 miles away, i.e. 6 hours ahead
 # of GMT). This is a time zone I think two hours east of Moscow. The
 # natural time zone is in between the two: 8 hours ahead of GMT."
 #
 # From Paul Eggert (2001-05-04):
 # This seems to be hopelessly confusing, so I asked Lee Hotz about it
 # in person.  He said that some Antarctic locations set their local
 # time so that noon is the warmest part of the day, and that this
 # changes during the year and does not necessarily correspond to mean
 # solar noon.  So the Vostok time might have been whatever the clocks
 # happened to be during their visit.  So we still don't really know what time
 # it is at Vostok.  But we'll guess +06.
 #
 Zone Antarctica/Vostok	0	-	-00	1957 Dec 16
 			6:00	-	+06
 
 # Yemen
 # Milne says 2:59:54 was the meridian of the saluting battery at Aden,
 # and that Yemen was at 1:55:56, the meridian of the Hagia Sophia.
 Zone	Asia/Aden	2:59:54	-	LMT	1950
 			3:00	-	+03
 
 # Bahrain
 #
 # From Paul Eggert (2020-07-23):
 # Most of this data comes from:
 # Stewart A. Why Gulf Standard Time is far from standard: the fascinating story
 # behind the time zone's invention. The National (Abu Dhabi). 2020-07-22.
 # https://www.thenational.ae/arts-culture/why-gulf-standard-time-is-far-from-standard-the-fascinating-story-behind-the-time-zone-s-invention-1.1052589
 # Stewart writes that before 1941 some companies in Bahrain were at +0330 and
 # others at +0323.  Reginald George Alban, a British political agent based in
 # Manama, worked to standardize this, and from 1941-07-20 Bahrain was at
 # +0330.  However, BOAC asked that clocks be moved to gain more light at day's
 # end, so Bahrain switched to +04 on 1944-01-01.
 #
 # Re the 1941 transition, Stewart privately sent me this citation:
 # "File 16/53 Enquiries Re: Calculation of Local Time", British Library: India
 # Office Records and Private Papers, IOR/R/15/2/1564, in Qatar Digital Library
 # https://www.qdl.qa/archive/81055/vdc_100000000282.0x00012b
 # It says there was no real standard in Bahrain before 1941-07-20.
 # +0330 was used by steamers of the British India Co, by Petroleum Concessions
 # and by Cable & Wireless; +0323 was used by the Eastern Bank Ltd, BOAC, and
 # Bahrein Petroleum (Bapco), and California Arabian Standard Oil Co (Casoc)
 # adopted DST effective 1941-05-24.  Alban suggested adopting DST, R.B. Coomb
 # of C&W countersuggested +0330, and although C.A. Rodstrom of Casoc (formerly
 # of Bapco) stated that Bahrain had formerly used +0330 before Bapco arrived
 # but Bapco switched to +0323 because of "constant confusion", the consensus
 # was +0330.  The government adopted +0330 in 1941-07-20 and companies seem to
 # have switched by 08-01.  No time of day was given for the 1940s transitions.
 Zone	Asia/Bahrain	3:22:20 -	LMT	1941 Jul 20  # Manamah
 			3:30	-	+0330	1944 Jan  1
 			4:00	-	+04	1972 Jun
 			3:00	-	+03
 
 # Brunei
 Zone	Asia/Brunei	7:39:40 -	LMT	1926 Mar # Bandar Seri Begawan
 			7:30	-	+0730	1933
 			8:00	-	+08
 
 # India
 #
 # From Paul Eggert (2014-09-06):
 # The 1876 Report of the Secretary of the [US] Navy, p 305 says that Madras
 # civil time was 5:20:57.3.
 #
 # From Paul Eggert (2014-08-21):
 # In tomorrow's The Hindu, Nitya Menon reports that India had two civil time
 # zones starting in 1884, one in Bombay and one in Calcutta, and that railways
 # used a third time zone based on Madras time (80° 18' 30" E).  Also,
 # in 1881 Bombay briefly switched to Madras time, but switched back.  See:
 # http://www.thehindu.com/news/cities/chennai/madras-375-when-madras-clocked-the-time/article6339393.ece
 #Zone	  Asia/Chennai  [not enough info to complete]
 
 # China
 # Long-shu Time (probably due to Long and Shu being two names of that area)
 # Guangxi, Guizhou, Hainan, Ningxia, Sichuan, Shaanxi, and Yunnan;
 # most of Gansu; west Inner Mongolia; west Qinghai; and the Guangdong
 # counties Deqing, Enping, Kaiping, Luoding, Taishan, Xinxing,
 # Yangchun, Yangjiang, Yu'nan, and Yunfu.
 Zone	Asia/Chongqing	7:06:20	-	LMT	1928     # or Chungking
 			7:00	-	+07	1980 May
 			8:00	PRC	C%sT
 Link Asia/Chongqing Asia/Chungking
 
 # Vietnam
 # From Paul Eggert (2014-10-13):
 # See Asia/Ho_Chi_Minh for the source for this data.
 # Trần's book says the 1954-55 transition to 07:00 in Hanoi was in
 # October 1954, with exact date and time unspecified.
 Zone	Asia/Hanoi	7:03:24 -	LMT	1906 Jul  1
 			7:06:30	-	PLMT	1911 May  1
 			7:00	-	+07	1942 Dec 31 23:00
 			8:00	-	+08	1945 Mar 14 23:00
 			9:00	-	+09	1945 Sep  2
 			7:00	-	+07	1947 Apr  1
 			8:00	-	+08	1954 Oct
 			7:00	-	+07
 
 # China
 # Changbai Time ("Long-white Time", Long-white = Heilongjiang area)
 # Heilongjiang (except Mohe county), Jilin
 Zone	Asia/Harbin	8:26:44	-	LMT	1928     # or Haerbin
 			8:30	-	+0830	1932 Mar
 			8:00	-	CST	1940
 			9:00	-	+09	1966 May
 			8:30	-	+0830	1980 May
 			8:00	PRC	C%sT
 
 # far west China
 Zone	Asia/Kashgar	5:03:56	-	LMT	1928     # or Kashi or Kaxgar
 			5:30	-	+0530	1940
 			5:00	-	+05	1980 May
 			8:00	PRC	C%sT
 
 # peninsular Malaysia
 # taken from Mok Ly Yng (2003-10-30)
 # https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html
 # This agrees with Singapore since 1905-06-01.
 Zone Asia/Kuala_Lumpur	6:46:46 -	LMT	1901 Jan  1
 			6:55:25	-	SMT	1905 Jun  1 # Singapore M.T.
 			7:00	-	+07	1933 Jan  1
 			7:00	0:20	+0720	1936 Jan  1
 			7:20	-	+0720	1941 Sep  1
 			7:30	-	+0730	1942 Feb 16
 			9:00	-	+09	1945 Sep 12
-			7:30	-	+0730	1982 Jan  1
+			7:30	-	+0730	1981 Dec 31 16:00u
 			8:00	-	+08
 
 # Kuwait
 Zone	Asia/Kuwait	3:11:56 -	LMT	1950
 			3:00	-	+03
 
 
 # Oman
 # Milne says 3:54:24 was the meridian of the Muscat Tidal Observatory.
 Zone	Asia/Muscat	3:54:24 -	LMT	1920
 			4:00	-	+04
 
 # India
 # From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne:
 # According to a Portuguese decree (1911-05-26)
 # https://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf
 # Portuguese India switched to UT +05 on 1912-01-01.
 #Zone	Asia/Panaji	[not enough info to complete]
 
 # Cambodia
 
 # From an adoptive daughter of the late Cambodian ruler Prince Sihanouk,
 # via Alois Treindl (2019-08-08):
 #
 # King Sihanouk said that, during the Japanese occupation, starting with
 # what historians refer to as "le coup de force du 9 mars 1945", Cambodia,
 # like the entire French Indochina, used Tokyo time zone. After Japan
 # surrendered, 2 September 1945, Cambodia fell under French rule again and
 # adopted Hanoi time zone again.
 #
 # However, on 7 January 1946, Sihanouk and Tioulong managed to obtain a
 # status of "internal autonomy" from the government of Charles de Gaulle.
 # Although many fields remained under the administration of the French
 # (customs, taxes, justice, defence, foreign affairs, etc.), the Cambodian
 # administration was responsible for religious matters and traditional
 # celebrations, which included our calendar and time.  The time zone was GMT
 # + 7 and _no_ DST was applied.
 #
 # After Sihanouk and Tioulong achieved full independence, on 9 November 1953,
 # GMT + 7 was maintained.
 
 # From Paul Eggert (2019-08-26):
 # See Asia/Ho_Chi_Minh for the source for most of rest of this data.
 
 Zone	Asia/Phnom_Penh	6:59:40 -	LMT	1906 Jul  1
 			7:06:30	-	PLMT	1911 May  1
 			7:00	-	+07	1942 Dec 31 23:00
 			8:00	-	+08	1945 Mar 14 23:00
 			9:00	-	+09	1945 Sep  2
 			7:00	-	+07
 
 # Israel
 Zone	Asia/Tel_Aviv	2:19:04 -	LMT	1880
 			2:21	-	JMT	1918
 			2:00	Zion	I%sT
 
 # Laos
 # From Paul Eggert (2014-10-11):
 # See Asia/Ho_Chi_Minh for the source for most of this data.
 # Trần's book says that Laos reverted to UT +07 on 1955-04-15.
 # Also, guess that Laos reverted to +07 on 1945-09-02, when Vietnam did;
 # this is probably wrong but it's better than guessing no transition.
 Zone	Asia/Vientiane	6:50:24 -	LMT	1906 Jul  1
 			7:06:30	-	PLMT	1911 May  1
 			7:00	-	+07	1942 Dec 31 23:00
 			8:00	-	+08	1945 Mar 14 23:00
 			9:00	-	+09	1945 Sep  2
 			7:00	-	+07	1947 Apr  1
 			8:00	-	+08	1955 Apr 15
 			7:00	-	+07
 
 # Jan Mayen
 # From Whitman:
 Zone Atlantic/Jan_Mayen	-1:00	-	-01
 
 # Iceland
 #
 # From Adam David (1993-11-06):
 # The name of the timezone in Iceland for system / mail / news purposes is GMT.
 #
 # (1993-12-05):
 # This material is paraphrased from the 1988 edition of the University of
 # Iceland Almanak.
 #
 # From January 1st, 1908 the whole of Iceland was standardised at 1 hour
 # behind GMT. Previously, local mean solar time was used in different parts
 # of Iceland, the almanak had been based on Reykjavík mean solar time which
 # was 1 hour and 28 minutes behind GMT.
 #
 # "first day of winter" referred to [below] means the first day of the 26 weeks
 # of winter, according to the old icelandic calendar that dates back to the
 # time the norsemen first settled Iceland.  The first day of winter is always
 # Saturday, but is not dependent on the Julian or Gregorian calendars.
 #
 # (1993-12-10):
 # I have a reference from the Oxford Icelandic-English dictionary for the
 # beginning of winter, which ties it to the ecclesiastical calendar (and thus
 # to the julian/gregorian calendar) over the period in question.
 #	the winter begins on the Saturday next before St. Luke's day
 #	(old style), or on St. Luke's day, if a Saturday.
 # St. Luke's day ought to be traceable from ecclesiastical sources. "old style"
 # might be a reference to the Julian calendar as opposed to Gregorian, or it
 # might mean something else (???).
 #
 # From Paul Eggert (2014-11-22):
 # The information below is taken from the 1988 Almanak; see
 # http://www.almanak.hi.is/klukkan.html
 #
 Rule	Iceland	1917	1919	-	Feb	19	23:00	1:00	-
 Rule	Iceland	1917	only	-	Oct	21	 1:00	0	-
 Rule	Iceland	1918	1919	-	Nov	16	 1:00	0	-
 Rule	Iceland	1921	only	-	Mar	19	23:00	1:00	-
 Rule	Iceland	1921	only	-	Jun	23	 1:00	0	-
 Rule	Iceland	1939	only	-	Apr	29	23:00	1:00	-
 Rule	Iceland	1939	only	-	Oct	29	 2:00	0	-
 Rule	Iceland	1940	only	-	Feb	25	 2:00	1:00	-
 Rule	Iceland	1940	1941	-	Nov	Sun>=2	 1:00s	0	-
 Rule	Iceland	1941	1942	-	Mar	Sun>=2	 1:00s	1:00	-
 # 1943-1946 - first Sunday in March until first Sunday in winter
 Rule	Iceland	1943	1946	-	Mar	Sun>=1	 1:00s	1:00	-
 Rule	Iceland	1942	1948	-	Oct	Sun>=22	 1:00s	0	-
 # 1947-1967 - first Sunday in April until first Sunday in winter
 Rule	Iceland	1947	1967	-	Apr	Sun>=1	 1:00s	1:00	-
 # 1949 and 1967 Oct transitions delayed by 1 week
 Rule	Iceland	1949	only	-	Oct	30	 1:00s	0	-
 Rule	Iceland	1950	1966	-	Oct	Sun>=22	 1:00s	0	-
 Rule	Iceland	1967	only	-	Oct	29	 1:00s	0	-
 
 Zone Atlantic/Reykjavik	-1:28	-	LMT	1908
 			-1:00	Iceland	-01/+00	1968 Apr  7  1:00s
 			 0:00	-	GMT
 Link Atlantic/Reykjavik Iceland
 
 # St Helena
 Zone Atlantic/St_Helena	-0:22:48 -	LMT	1890 # Jamestown
 			-0:22:48 -	JMT	1951 # Jamestown Mean Time
 			 0:00	-	GMT
 
 # King Island
 Zone Australia/Currie	9:35:28	-	LMT	1895 Sep
 			10:00	AT	AE%sT	1919 Oct 24
 			10:00	Aus	AE%sT	1968 Oct 15
 			10:00	AT	AE%sT
 
 
 # Netherlands
 
 # Howse writes that the Netherlands' railways used GMT between 1892 and 1940,
 # but for other purposes the Netherlands used Amsterdam mean time.
 
 # However, Robert H. van Gent writes (2001-04-01):
 # Howse's statement is only correct up to 1909. From 1909-05-01 (00:00:00
 # Amsterdam mean time) onwards, the whole of the Netherlands (including
 # the Dutch railways) was required by law to observe Amsterdam mean time
 # (19 minutes 32.13 seconds ahead of GMT). This had already been the
 # common practice (except for the railways) for many decades but it was
 # not until 1909 when the Dutch government finally defined this by law.
 # On 1937-07-01 this was changed to 20 minutes (exactly) ahead of GMT and
 # was generally known as Dutch Time ("Nederlandse Tijd").
 #
 # (2001-04-08):
 # 1892-05-01 was the date when the Dutch railways were by law required to
 # observe GMT while the remainder of the Netherlands adhered to the common
 # practice of following Amsterdam mean time.
 #
 # (2001-04-09):
 # In 1835 the authorities of the province of North Holland requested the
 # municipal authorities of the towns and cities in the province to observe
 # Amsterdam mean time but I do not know in how many cases this request was
 # actually followed.
 #
 # From 1852 onwards the Dutch telegraph offices were by law required to
 # observe Amsterdam mean time. As the time signals from the observatory of
 # Leiden were also distributed by the telegraph system, I assume that most
 # places linked up with the telegraph (and railway) system automatically
 # adopted Amsterdam mean time.
 #
 # Although the early Dutch railway companies initially observed a variety
 # of times, most of them had adopted Amsterdam mean time by 1858 but it
 # was not until 1866 when they were all required by law to observe
 # Amsterdam mean time.
 
 # The data entries before 1945 are taken from
 # https://www.staff.science.uu.nl/~gent0113/wettijd/wettijd.htm
 
 # From Paul Eggert (2021-05-09):
 # I invented the abbreviations AMT for Amsterdam Mean Time and NST for
 # Netherlands Summer Time, used in the Netherlands from 1835 to 1937.
 
 Rule	Neth	1916	only	-	May	 1	0:00	1:00	NST	# Netherlands Summer Time
 Rule	Neth	1916	only	-	Oct	 1	0:00	0	AMT	# Amsterdam Mean Time
 Rule	Neth	1917	only	-	Apr	16	2:00s	1:00	NST
 Rule	Neth	1917	only	-	Sep	17	2:00s	0	AMT
 Rule	Neth	1918	1921	-	Apr	Mon>=1	2:00s	1:00	NST
 Rule	Neth	1918	1921	-	Sep	lastMon	2:00s	0	AMT
 Rule	Neth	1922	only	-	Mar	lastSun	2:00s	1:00	NST
 Rule	Neth	1922	1936	-	Oct	Sun>=2	2:00s	0	AMT
 Rule	Neth	1923	only	-	Jun	Fri>=1	2:00s	1:00	NST
 Rule	Neth	1924	only	-	Mar	lastSun	2:00s	1:00	NST
 Rule	Neth	1925	only	-	Jun	Fri>=1	2:00s	1:00	NST
 # From 1926 through 1939 DST began 05-15, except that it was delayed by a week
 # in years when 05-15 fell in the Pentecost weekend.
 Rule	Neth	1926	1931	-	May	15	2:00s	1:00	NST
 Rule	Neth	1932	only	-	May	22	2:00s	1:00	NST
 Rule	Neth	1933	1936	-	May	15	2:00s	1:00	NST
 Rule	Neth	1937	only	-	May	22	2:00s	1:00	NST
 Rule	Neth	1937	only	-	Jul	 1	0:00	1:00	S
 Rule	Neth	1937	1939	-	Oct	Sun>=2	2:00s	0	-
 Rule	Neth	1938	1939	-	May	15	2:00s	1:00	S
 Rule	Neth	1945	only	-	Apr	 2	2:00s	1:00	S
 Rule	Neth	1945	only	-	Sep	16	2:00s	0	-
 		#STDOFF	0:19:32.13
 Zone Europe/Amsterdam	0:19:32 -	LMT	1835
 			0:19:32	Neth	%s	1937 Jul  1
 			0:20	Neth +0020/+0120 1940 May 16  0:00
 			1:00	C-Eur	CE%sT	1945 Apr  2  2:00
 			1:00	Neth	CE%sT	1977
 			1:00	EU	CE%sT
 
 
 # Northern Ireland
 Zone	Europe/Belfast	-0:23:40 -	LMT	1880 Aug  2
 			-0:25:21 -	DMT	1916 May 21  2:00
 						# DMT = Dublin/Dunsink MT
 			-0:25:21 1:00	IST	1916 Oct  1  2:00s
 						# IST = Irish Summer Time
 			 0:00	GB-Eire	%s	1968 Oct 27
 			 1:00	-	BST	1971 Oct 31  2:00u
 			 0:00	GB-Eire	%s	1996
 			 0:00	EU	GMT/BST
 
 
 # Denmark
 
 # From Jesper Nørgaard Welen (2005-04-26):
 # the law [introducing standard time] was in effect from 1894-01-01....
 # The page https://www.retsinformation.dk/eli/lta/1893/83
 # confirms this, and states that the law was put forth 1893-03-29.
 #
 # The EU [actually, EEC and Euratom] treaty with effect from 1973:
 # https://www.retsinformation.dk/eli/lta/1972/21100
 #
 # This provoked a new law from 1974 to make possible summer time changes
 # in subsequent decrees with the law
 # https://www.retsinformation.dk/eli/lta/1974/223
 #
 # It seems however that no decree was set forward until 1980.  I have
 # not found any decree, but in another related law, the effecting DST
 # changes are stated explicitly to be from 1980-04-06 at 02:00 to
 # 1980-09-28 at 02:00.  If this is true, this differs slightly from
 # the EU rule in that DST runs to 02:00, not 03:00.  We don't know
 # when Denmark began using the EU rule correctly, but we have only
 # confirmation of the 1980-time, so I presume it was correct in 1981:
 # The law is about the management of the extra hour, concerning
 # working hours reported and effect on obligatory-rest rules (which
 # was suspended on that night):
 # https://web.archive.org/web/20140104053304/https://www.retsinformation.dk/Forms/R0710.aspx?id=60267
 
 # From Jesper Nørgaard Welen (2005-06-11):
 # The Herning Folkeblad (1980-09-26) reported that the night between
 # Saturday and Sunday the clock is set back from three to two.
 
 # From Paul Eggert (2005-06-11):
 # Hence the "02:00" of the 1980 law refers to standard time, not
 # wall-clock time, and so the EU rules were in effect in 1980.
 
 Rule	Denmark	1916	only	-	May	14	23:00	1:00	S
 Rule	Denmark	1916	only	-	Sep	30	23:00	0	-
 Rule	Denmark	1940	only	-	May	15	 0:00	1:00	S
 Rule	Denmark	1945	only	-	Apr	 2	 2:00s	1:00	S
 Rule	Denmark	1945	only	-	Aug	15	 2:00s	0	-
 Rule	Denmark	1946	only	-	May	 1	 2:00s	1:00	S
 Rule	Denmark	1946	only	-	Sep	 1	 2:00s	0	-
 Rule	Denmark	1947	only	-	May	 4	 2:00s	1:00	S
 Rule	Denmark	1947	only	-	Aug	10	 2:00s	0	-
 Rule	Denmark	1948	only	-	May	 9	 2:00s	1:00	S
 Rule	Denmark	1948	only	-	Aug	 8	 2:00s	0	-
 #
 Zone Europe/Copenhagen	 0:50:20 -	LMT	1890
 			 0:50:20 -	CMT	1894 Jan  1 # Copenhagen MT
 			 1:00	Denmark	CE%sT	1942 Nov  2  2:00s
 			 1:00	C-Eur	CE%sT	1945 Apr  2  2:00
 			 1:00	Denmark	CE%sT	1980
 			 1:00	EU	CE%sT
 
 # Guernsey
 # Data from Joseph S. Myers
 # https://mm.icann.org/pipermail/tz/2013-September/019883.html
 # References to be added
 # LMT is for Town Church, St. Peter Port, 49° 27' 17" N, 2° 32' 10" W.
 Zone	Europe/Guernsey	-0:10:09 -	LMT	1913 Jun 18
 			 0:00	GB-Eire	%s	1940 Jul  2
 			 1:00	C-Eur	CE%sT	1945 May  8
 			 0:00	GB-Eire	%s	1968 Oct 27
 			 1:00	-	BST	1971 Oct 31  2:00u
 			 0:00	GB-Eire	%s	1996
 			 0:00	EU	GMT/BST
 
 # Isle of Man
 #
 # From Lester Caine (2013-09-04):
 # The Isle of Man legislation is now on-line at
 # , starting with the original Statutory
 # Time Act in 1883 and including additional confirmation of some of
 # the dates of the 'Summer Time' orders originating at
 # Westminster.  There is a little uncertainty as to the starting date
 # of the first summer time in 1916 which may have been announced a
 # couple of days late.  There is still a substantial number of
 # documents to work through, but it is thought that every GB change
 # was also implemented on the island.
 #
 # AT4 of 1883 - The Statutory Time et cetera Act 1883 -
 # LMT Location - 54.1508N -4.4814E - Tynwald Hill ( Manx parliament )
 Zone Europe/Isle_of_Man	-0:17:55 -	LMT	1883 Mar 30  0:00s
 			 0:00	GB-Eire	%s	1968 Oct 27
 			 1:00	-	BST	1971 Oct 31  2:00u
 			 0:00	GB-Eire	%s	1996
 			 0:00	EU	GMT/BST
 
 # Jersey
 # Data from Joseph S. Myers
 # https://mm.icann.org/pipermail/tz/2013-September/019883.html
 # References to be added
 # LMT is for Parish Church, St. Helier, 49° 11' 0.57" N, 2° 6' 24.33" W.
 Zone	Europe/Jersey	-0:08:26 -	LMT	1898 Jun 11 16:00u
 			 0:00	GB-Eire	%s	1940 Jul  2
 			 1:00	C-Eur	CE%sT	1945 May  8
 			 0:00	GB-Eire	%s	1968 Oct 27
 			 1:00	-	BST	1971 Oct 31  2:00u
 			 0:00	GB-Eire	%s	1996
 			 0:00	EU	GMT/BST
 
 # Slovenia
 Zone Europe/Ljubljana	0:58:04	-	LMT	1884
 			1:00	-	CET	1941 Apr 18 23:00
 			1:00	C-Eur	CE%sT	1945 May  8  2:00s
 			1:00	1:00	CEST	1945 Sep 16  2:00s
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
 
 # Luxembourg
 
 # Whitman disagrees with most of these dates in minor ways;
 # go with Shanks & Pottenger.
 Rule	Lux	1916	only	-	May	14	23:00	1:00	S
 Rule	Lux	1916	only	-	Oct	 1	 1:00	0	-
 Rule	Lux	1917	only	-	Apr	28	23:00	1:00	S
 Rule	Lux	1917	only	-	Sep	17	 1:00	0	-
 Rule	Lux	1918	only	-	Apr	Mon>=15	 2:00s	1:00	S
 Rule	Lux	1918	only	-	Sep	Mon>=15	 2:00s	0	-
 Rule	Lux	1919	only	-	Mar	 1	23:00	1:00	S
 Rule	Lux	1919	only	-	Oct	 5	 3:00	0	-
 Rule	Lux	1920	only	-	Feb	14	23:00	1:00	S
 Rule	Lux	1920	only	-	Oct	24	 2:00	0	-
 Rule	Lux	1921	only	-	Mar	14	23:00	1:00	S
 Rule	Lux	1921	only	-	Oct	26	 2:00	0	-
 Rule	Lux	1922	only	-	Mar	25	23:00	1:00	S
 Rule	Lux	1922	only	-	Oct	Sun>=2	 1:00	0	-
 Rule	Lux	1923	only	-	Apr	21	23:00	1:00	S
 Rule	Lux	1923	only	-	Oct	Sun>=2	 2:00	0	-
 Rule	Lux	1924	only	-	Mar	29	23:00	1:00	S
 Rule	Lux	1924	1928	-	Oct	Sun>=2	 1:00	0	-
 Rule	Lux	1925	only	-	Apr	 5	23:00	1:00	S
 Rule	Lux	1926	only	-	Apr	17	23:00	1:00	S
 Rule	Lux	1927	only	-	Apr	 9	23:00	1:00	S
 Rule	Lux	1928	only	-	Apr	14	23:00	1:00	S
 Rule	Lux	1929	only	-	Apr	20	23:00	1:00	S
 
 Zone Europe/Luxembourg	0:24:36 -	LMT	1904 Jun
 			1:00	Lux	CE%sT	1918 Nov 25
 			0:00	Lux	WE%sT	1929 Oct  6  2:00s
 			0:00	Belgium	WE%sT	1940 May 14  3:00
 			1:00	C-Eur	WE%sT	1944 Sep 18  3:00
 			1:00	Belgium	CE%sT	1977
 			1:00	EU	CE%sT
 
 # Monaco
 #
 # From Michael Deckers (2020-06-12):
 # In the "Journal de Monaco" of 1892-05-24, online at
 # https://journaldemonaco.gouv.mc/var/jdm/storage/original/application/b1c67c12c5af11b41ea888fb048e4fe8.pdf
 # we read: ...
 #  [In virtue of a Sovereign Ordinance of the May 13 of the current [year],
 #   legal time in the Principality will be set to, from the date of June 1,
 #   1892 onwards, to the meridian of Paris, as in France.]
 # In the "Journal de Monaco" of 1911-03-28, online at
 # https://journaldemonaco.gouv.mc/var/jdm/storage/original/application/de74ffb7db53d4f599059fe8f0ed482a.pdf
 # we read an ordinance of 1911-03-16: ...
 #  [Legal time in the Principality will be set, from the date of promulgation
 #   of the present ordinance, to legal time in France....  Consequently, legal
 #   time will be retarded by 9 minutes and 21 seconds.]
 #
 Zone	Europe/Monaco	0:29:32 -	LMT	1892 Jun  1
 			0:09:21	-	PMT	1911 Mar 29 # Paris Mean Time
 			0:00	France	WE%sT	1945 Sep 16  3:00
 			1:00	France	CE%sT	1977
 			1:00	EU	CE%sT
 
 
 # Norway
 
 # http://met.no/met/met_lex/q_u/sommertid.html (2004-01) agrees with Shanks &
 # Pottenger.
 Rule	Norway	1916	only	-	May	22	1:00	1:00	S
 Rule	Norway	1916	only	-	Sep	30	0:00	0	-
 Rule	Norway	1945	only	-	Apr	 2	2:00s	1:00	S
 Rule	Norway	1945	only	-	Oct	 1	2:00s	0	-
 Rule	Norway	1959	1964	-	Mar	Sun>=15	2:00s	1:00	S
 Rule	Norway	1959	1965	-	Sep	Sun>=15	2:00s	0	-
 Rule	Norway	1965	only	-	Apr	25	2:00s	1:00	S
 
 Zone	Europe/Oslo	0:43:00 -	LMT	1895 Jan  1
 			1:00	Norway	CE%sT	1940 Aug 10 23:00
 			1:00	C-Eur	CE%sT	1945 Apr  2  2:00
 			1:00	Norway	CE%sT	1980
 			1:00	EU	CE%sT
 Link	Europe/Oslo	Arctic/Longyearbyen
 #PACKRATLIST zone.tab Link Europe/Oslo Atlantic/Jan_Mayen
 
 # Bosnia and Herzegovina
 Zone	Europe/Sarajevo	1:13:40	-	LMT	1884
 			1:00	-	CET	1941 Apr 18 23:00
 			1:00	C-Eur	CE%sT	1945 May  8  2:00s
 			1:00	1:00	CEST	1945 Sep 16  2:00s
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
 # North Macedonia
 Zone	Europe/Skopje	1:25:44	-	LMT	1884
 			1:00	-	CET	1941 Apr 18 23:00
 			1:00	C-Eur	CE%sT	1945 May  8  2:00s
 			1:00	1:00	CEST	1945 Sep 16  2:00s
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
 
 # Sweden
 
 # From Ivan Nilsson (2001-04-13), superseding Shanks & Pottenger:
 #
 # The law "Svensk författningssamling 1878, no 14" about standard time in 1879:
 # From the beginning of 1879 (that is 01-01 00:00) the time for all
 # places in the country is "the mean solar time for the meridian at
 # three degrees, or twelve minutes of time, to the west of the
 # meridian of the Observatory of Stockholm".  The law is dated 1878-05-31.
 #
 # The observatory at that time had the meridian 18° 03' 30"
 # eastern longitude = 01:12:14 in time.  Less 12 minutes gives the
 # national standard time as 01:00:14 ahead of GMT....
 #
 # About the beginning of CET in Sweden. The lawtext ("Svensk
 # författningssamling 1899, no 44") states, that "from the beginning
 # of 1900... ... the same as the mean solar time for the meridian at
 # the distance of one hour of time from the meridian of the English
 # observatory at Greenwich, or at 12 minutes 14 seconds to the west
 # from the meridian of the Observatory of Stockholm". The law is dated
 # 1899-06-16.  In short: At 1900-01-01 00:00:00 the new standard time
 # in Sweden is 01:00:00 ahead of GMT.
 #
 # 1916: The lawtext ("Svensk författningssamling 1916, no 124") states
 # that "1916-05-15 is considered to begin one hour earlier". It is
 # pretty obvious that at 05-14 23:00 the clocks are set to 05-15 00:00....
 # Further the law says, that "1916-09-30 is considered to end one hour later".
 #
 # The laws regulating [DST] are available on the site of the Swedish
 # Parliament beginning with 1985 - the laws regulating 1980/1984 are
 # not available on the site (to my knowledge they are only available
 # in Swedish):  (type
 # "sommartid" without the quotes in the field "Fritext" and then click
 # the Sök-button).
 #
 # (2001-05-13):
 #
 # I have now found a newspaper stating that at 1916-10-01 01:00
 # summertime the church-clocks etc were set back one hour to show
 # 1916-10-01 00:00 standard time.  The article also reports that some
 # people thought the switch to standard time would take place already
 # at 1916-10-01 00:00 summer time, but they had to wait for another
 # hour before the event took place.
 #
 # Source: The newspaper "Dagens Nyheter", 1916-10-01, page 7 upper left.
 
 # An extra-special abbreviation style is SET for Swedish Time (svensk
 # normaltid) 1879-1899, 3° west of the Stockholm Observatory.
 
 Zone Europe/Stockholm	1:12:12 -	LMT	1879 Jan  1
 			1:00:14	-	SET	1900 Jan  1 # Swedish Time
 			1:00	-	CET	1916 May 14 23:00
 			1:00	1:00	CEST	1916 Oct  1  1:00
 			1:00	-	CET	1980
 			1:00	EU	CE%sT
 
 
 # Moldova / Transnistria
 Zone	Europe/Tiraspol	1:58:32	-	LMT	1880
 			1:55	-	CMT	1918 Feb 15 # Chisinau MT
 			1:44:24	-	BMT	1931 Jul 24 # Bucharest MT
 			2:00	Romania	EE%sT	1940 Aug 15
 			2:00	1:00	EEST	1941 Jul 17
 			1:00	C-Eur	CE%sT	1944 Aug 24
 			3:00	Russia	MSK/MSD	1991 Mar 31  2:00
 			2:00	Russia	EE%sT	1992 Jan 19  2:00
 			3:00	Russia	MSK/MSD
 
 # Ukraine
 #
 # Although Shanks & Pottenger say Transcarpathia used CET 1990/1991,
 # this unreliable source contradicts contemporaneous government resolutions
 # (see the commentary for Ukraine in the 'europe' file)
 # so for now this dubious zone is in 'backzone'.
 # "Uzhhorod" is the transliteration of the Ukrainian spelling, but
 # "Uzhgorod" was a common English spelling when this dubious zone was
 # added to TZDB in 1999.
 Zone Europe/Uzhgorod	1:29:12 -	LMT	1890 Oct
 			1:00	-	CET	1940
 			1:00	C-Eur	CE%sT	1944 Oct
 			1:00	1:00	CEST	1944 Oct 26
 			1:00	-	CET	1945 Jun 29
 			3:00	Russia	MSK/MSD	1990
 			3:00	-	MSK	1990 Jul  1  2:00
 			1:00	-	CET	1991 Mar 31  3:00
 			2:00	-	EET	1992 Mar 20
 			2:00	C-Eur	EE%sT	1996 May 13
 			2:00	EU	EE%sT
 
 # Liechtenstein
 
 # From Paul Eggert (2022-07-21):
 # Shanks & Pottenger say Vaduz is like Zurich starting June 1894.
 
 # From Alois Treindl (2019-07-04):
 # I was able to access the online archive of the Vaduz paper Vaterland ...
 # I could confirm from the paper that Liechtenstein did in fact follow
 # the same DST in 1941 and 1942 as Switzerland did.
 
 Zone	Europe/Vaduz	0:38:04 -	LMT	1894 Jun
 			1:00	Swiss	CE%sT	1981
 			1:00	EU	CE%sT
 
 # Croatia
 Zone	Europe/Zagreb	1:03:52	-	LMT	1884
 			1:00	-	CET	1941 Apr 18 23:00
 			1:00	C-Eur	CE%sT	1945 May  8  2:00s
 			1:00	1:00	CEST	1945 Sep 16  2:00s
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
 # Ukraine
 
 # Although Shanks & Pottenger say Zaporizhzhia and eastern Lugansk
 # observed DST 1990/1991, this unreliable source contradicts contemporaneous
 # government resolutions (see the commentary for Ukraine in the 'europe' file)
 # so for now this dubious zone is in 'backzone'.
 # "Zaporizhzhia" is the transliteration of the Ukrainian name, but
 # "Zaporozhye" was a common English spelling when this dubious zone was
 # added to TZDB in 1999.
 Zone Europe/Zaporozhye	2:20:40 -	LMT	1880
 			2:20	-	+0220	1924 May  2
 			2:00	-	EET	1930 Jun 21
 			3:00	-	MSK	1941 Aug 25
 			1:00	C-Eur	CE%sT	1943 Oct 25
 			3:00	Russia	MSK/MSD	1991 Mar 31  2:00
 			2:00	E-Eur	EE%sT	1992 Mar 20
 			2:00	C-Eur	EE%sT	1996 May 13
 			2:00	EU	EE%sT
 
 # Madagascar
 Zone Indian/Antananarivo 3:10:04 -	LMT	1911 Jul
 			3:00	-	EAT	1954 Feb 27 23:00s
 			3:00	1:00	EAST	1954 May 29 23:00s
 			3:00	-	EAT
 
 # Christmas
 Zone Indian/Christmas	7:02:52 -	LMT	1895 Feb
 			7:00	-	+07
 
 # Cocos (Keeling) Is
 # These islands were ruled by the Ross family from about 1830 to 1978.
 # We don't know when standard time was introduced; for now, we guess 1900.
 Zone	Indian/Cocos	6:27:40	-	LMT	1900
 			6:30	-	+0630
 
 # Comoros
 Zone	Indian/Comoro	2:53:04 -	LMT	1911 Jul # Moroni, Gran Comoro
 			3:00	-	EAT
 
 # Kerguelen
 Zone Indian/Kerguelen	0	-	-00	1950 # Port-aux-Français
 			5:00	-	+05
 
 # Seychelles
 #
 # From P Chan (2020-11-27):
 # Standard Time was adopted on 1907-01-01.
 #
 # Standard Time Ordinance (Chapter 237)
 # The Laws of Seychelles in Force on the 31st December, 1971, Vol. 6, p 571
 # https://books.google.com/books?id=efE-AQAAIAAJ&pg=PA571
 #
 # From Tim Parenti (2020-12-05):
 # A footnote on https://books.google.com/books?id=DYdDAQAAMAAJ&pg=PA1689
 # confirms that Ordinance No. 9 of 1906 "was brought into force on the 1st
 # January, 1907."
 
 Zone	Indian/Mahe	3:41:48 -	LMT	1907 Jan  1 # Victoria
 			4:00	-	+04
 # From Paul Eggert (2001-05-30):
 # Aldabra, Farquhar, and Desroches, originally dependencies of the
 # Seychelles, were transferred to the British Indian Ocean Territory
 # in 1965 and returned to Seychelles control in 1976.  We don't know
 # whether this affected their time zone, so omit this for now.
 # Possibly the islands were uninhabited.
 
 
 # Mayotte
 Zone	Indian/Mayotte	3:00:56 -	LMT	1911 Jul # Mamoutzou
 			3:00	-	EAT
 
 # Réunion
 Zone	Indian/Reunion	3:41:52 -	LMT	1911 Jun # Saint-Denis
 			4:00	-	+04
 #
 # Scattered Islands (Îles Éparses) administered from Réunion are as follows.
 # The following information about them is taken from
 # Îles Éparses (, 1997-07-22,
 # in French; no longer available as of 1999-08-17).
 # We have no info about their time zone histories.
 #
 # Bassas da India - uninhabited
 # Europa Island - inhabited from 1905 to 1910 by two families
 # Glorioso Is - inhabited until at least 1958
 # Juan de Nova - uninhabited
 # Tromelin - inhabited until at least 1958
 
 # Micronesia
 # Also see Pacific/Pohnpei and commentary for Micronesia in 'australasia'.
 #
 # From Paul Eggert (2018-11-18):
 # Alan Eugene Davis writes (1996-03-16),
 # "I am certain, having lived there for the past decade, that 'Truk'
 # (now properly known as Chuuk) ... is in the time zone GMT+10."
 # Shanks & Pottenger write that Truk switched from UT +10 to +11
 # on 1978-10-01; ignore this for now.
 Zone Pacific/Chuuk	-13:52:52 -	LMT	1844 Dec 31
 			 10:07:08 -	LMT	1901
 			 10:00	-	+10	1914 Oct
 			  9:00	-	+09	1919 Feb  1
 			 10:00	-	+10	1941 Apr  1
 			  9:00	-	+09	1945 Aug
 			 10:00	-	+10
 Link Pacific/Chuuk Pacific/Truk
 Link Pacific/Chuuk Pacific/Yap
 
 # Phoenix Islands, Kiribati
 # From Paul Eggert (2021-05-27):
 # Enderbury was inhabited 1860/1880s to mine guano, and 1938-03-06/1942-02-09
 # for aviation (ostensibly commercial, but military uses foreseen).
 # The 19th-century dates are approximate.  See Pacific/Kanton for
 # the currently-inhabited representative for this timezone.
 Zone Pacific/Enderbury	0	-	-00	1860
 			-11:24:20 -	LMT	1885
 			0	-	-00	1938 Mar  6
 			-12:00	-	-12	1942 Feb  9
 			0	-	-00
 
 # Tuvalu
 Zone Pacific/Funafuti	11:56:52 -	LMT	1901
 			12:00	-	+12
 
 # Johnston
 Zone Pacific/Johnston	-10:00	-	HST
 
 # Marshall Is
 Zone Pacific/Majuro	 11:24:48 -	LMT	1901
 			 11:00	-	+11	1914 Oct
 			  9:00	-	+09	1919 Feb  1
 			 11:00	-	+11	1937
 			 10:00	-	+10	1941 Apr  1
 			  9:00	-	+09	1944 Jan 30
 			 11:00	-	+11	1969 Oct
 			 12:00	-	+12
 
 # Midway
 #
 # From Mark Brader (2005-01-23):
 # [Fallacies and Fantasies of Air Transport History, by R.E.G. Davies,
 # published 1994 by Paladwr Press, McLean, VA, USA; ISBN 0-9626483-5-3]
 # reproduced a Pan American Airways timetable from 1936, for their weekly
 # "Orient Express" flights between San Francisco and Manila, and connecting
 # flights to Chicago and the US East Coast.  As it uses some time zone
 # designations that I've never seen before:....
 # Fri. 6:30A Lv. HONOLOLU (Pearl Harbor), H.I.   H.L.T. Ar. 5:30P Sun.
 #  "   3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A  "
 #
 Zone Pacific/Midway	-11:49:28 -	LMT	1901
 			-11:00	-	-11	1956 Jun  3
 			-11:00	1:00	-10	1956 Sep  2
 			-11:00	-	SST	# S=Samoa
 
 # Micronesia
 # Also see Pacific/Chuuk and commentary for Micronesia in 'australasia'.
 Zone Pacific/Pohnpei	-13:27:08 -	LMT	1844 Dec 31	# Kolonia
 			 10:32:52 -	LMT	1901
 			 11:00	-	+11	1914 Oct
 			  9:00	-	+09	1919 Feb  1
 			 11:00	-	+11	1937
 			 10:00	-	+10	1941 Apr  1
 			  9:00	-	+09	1945 Aug
 			 11:00	-	+11
 Link Pacific/Pohnpei Pacific/Ponape
 
 # N Mariana Is
 #
 # From Paul Eggert (2022-08-16):
 # Although Shanks & Pottenger say Saipan used +09 and then switched
 # to Guam time in October 1969, this is surely wrong.
 # Saipan used Guam time in the late 1950s; see page 4 of the minutes on the
 # conference of the 12th Saipan Legislature and the Select Committee on
 # Saipan Mission, 5th Guam Legislature (1959-09-11):
 # http://www.nmhcouncil.org/nmhc_archives/U.S.%20Navy%20Civil%20Affairs%20Files%201944-1962/1959/1959%2009%2017%20letter,%20minutes%20of%20conference,%20Borja.pdf
 # For now, assume Saipan switched to Guam time after the Battle of Saipan.
 #
 Zone Pacific/Saipan	-14:17:00 -	LMT	1844 Dec 31
 			 9:43:00 -	LMT	1901
 			 9:00	-	+09	1944 Jul  9
 			10:00	Guam	G%sT	2000 Dec 23
 			10:00	-	ChST	# Chamorro Standard Time
 
 
 # Wake
 
 # From Vernice Anderson, Personal Secretary to Philip Jessup,
 # US Ambassador At Large (oral history interview, 1971-02-02):
 #
 # Saturday, the 14th [of October, 1950] - ...  The time was all the
 # more confusing at that point, because we had crossed the
 # International Date Line, thus getting two Sundays.  Furthermore, we
 # discovered that Wake Island had two hours of daylight saving time
 # making calculation of time in Washington difficult if not almost
 # impossible.
 #
 # https://www.trumanlibrary.org/oralhist/andrsonv.htm
 
 # From Paul Eggert (2003-03-23):
 # We have no other report of DST in Wake Island, so omit this info for now.
 
 # Also see commentary for Micronesia in 'australasia'.
 Zone	Pacific/Wake	11:06:28 -	LMT	1901
 			12:00	-	+12
 
 
 # Wallis and Futuna
 Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 			12:00	-	+12
 
 # Local Variables:
 # coding: utf-8
 # End:
diff --git a/europe b/europe
index 6ac41e7272a2..a3547b4f81a4 100644
--- a/europe
+++ b/europe
@@ -1,3853 +1,3877 @@
 # tzdb data for Europe and environs
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # This file is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
 # From Paul Eggert (2017-02-10):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 #
 # Many years ago Gwillim Law wrote that a good source
 # for time zone data was the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
 # of the IATA's data after 1990.  Except where otherwise noted,
 # IATA SSIM is the source for entries after 1990.
 #
 # A reliable and entertaining source about time zones is
 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
 #
 # Except where otherwise noted, Shanks & Pottenger is the source for
 # entries through 1991, and IATA SSIM is the source for entries afterwards.
 #
 # Other sources occasionally used include:
 #
 #	Edward W. Whitman, World Time Differences,
 #	Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
 #	which I found in the UCLA library.
 #
 #	William Willett, The Waste of Daylight, 19th edition
 #	
 #	[PDF] (1914-03)
 #
 #	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
 #	.  He writes:
 #	"It is requested that corrections and additions to these tables
 #	may be sent to Mr. John Milne, Royal Geographical Society,
 #	Savile Row, London."  Nowadays please email them to tz@iana.org.
 #
 #	Byalokoz EL. New Counting of Time in Russia since July 1, 1919.
 #	This Russian-language source was consulted by Vladimir Karpinsky; see
 #	https://mm.icann.org/pipermail/tz/2014-August/021320.html
 #	The full Russian citation is:
 #	Бялокоз, Евгений Людвигович. Новый счет времени в течении суток
 #	введенный декретом Совета народных комиссаров для всей России с 1-го
 #	июля 1919 г. / Изд. 2-е Междуведомственной комиссии. - Петроград:
 #	Десятая гос. тип., 1919.
 #	http://resolver.gpntb.ru/purl?docushare/dsweb/Get/Resource-2011/Byalokoz__E.L.__Novyy__schet__vremeni__v__techenie__sutok__izd__2(1).pdf
 #
 #	Brazil's Divisão Serviço da Hora (DSHO),
 #	History of Summer Time
 #	
 #	(1998-09-21, in Portuguese)
 #
 # I invented the abbreviations marked '*' in the following table;
 # the rest are variants of the "xMT" pattern for a city's mean time,
 # or are from other sources.  Corrections are welcome!
 #                   std  dst  2dst
 #                   LMT             Local Mean Time
 #       -4:00       AST  ADT        Atlantic
 #        0:00       GMT  BST  BDST  Greenwich, British Summer
 #        0:00       GMT  IST        Greenwich, Irish Summer
 #        0:00       WET  WEST WEMT  Western Europe
 #        1:00       BST             British Standard (1968-1971)
 #        1:00       IST  GMT        Irish Standard (1968-) with winter DST
 #        1:00       CET  CEST CEMT  Central Europe
 #        1:00:14    SET             Swedish (1879-1899)
 #        1:36:34    RMT* LST*       Riga, Latvian Summer (1880-1926)*
 #        2:00       EET  EEST       Eastern Europe
 #        3:00       MSK  MSD  MDST* Moscow
 
 # From Peter Ilieve (1994-12-04), re EEC/EC/EU members:
 # The original six: Belgium, France, (West) Germany, Italy,
 # Luxembourg, the Netherlands.
 # Plus, from 1 Jan 73: Denmark, Ireland, United Kingdom.
 # Plus, from 1 Jan 81: Greece.
 # Plus, from 1 Jan 86: Spain, Portugal.
 # Plus, from 1 Jan 95: Austria, Finland, Sweden. (Norway negotiated terms for
 # entry but in a referendum on 28 Nov 94 the people voted No by 52.2% to 47.8%
 # on a turnout of 88.6%. This was almost the same result as Norway's previous
 # referendum in 1972, they are the only country to have said No twice.
 # Referendums in the other three countries voted Yes.)
 # ...
 # Estonia ... uses EU dates but not at 01:00 GMT, they use midnight GMT.
 # I don't think they know yet what they will do from 1996 onwards.
 # ...
 # There shouldn't be any [current members who are not using EU rules].
 # A Directive has the force of law, member states are obliged to enact
 # national law to implement it. The only contentious issue was the
 # different end date for the UK and Ireland, and this was always allowed
 # in the Directive.
 
 
 ###############################################################################
 
 # Britain (United Kingdom) and Ireland (Eire)
 
 # From Peter Ilieve (1994-07-06):
 #
 # On 17 Jan 1994 the Independent, a UK quality newspaper, had a piece about
 # historical vistas along the Thames in west London. There was a photo
 # and a sketch map showing some of the sightlines involved. One paragraph
 # of the text said:
 #
 # 'An old stone obelisk marking a forgotten terrestrial meridian stands
 # beside the river at Kew. In the 18th century, before time and longitude
 # was standardised by the Royal Observatory in Greenwich, scholars observed
 # this stone and the movement of stars from Kew Observatory nearby. They
 # made their calculations and set the time for the Horse Guards and Parliament,
 # but now the stone is obscured by scrubwood and can only be seen by walking
 # along the towpath within a few yards of it.'
 #
 # I have a one inch to one mile map of London and my estimate of the stone's
 # position is 51° 28' 30" N, 0° 18' 45" W. The longitude should
 # be within about ±2". The Ordnance Survey grid reference is TQ172761.
 #
 # [This yields STDOFF = -0:01:15 for London LMT in the 18th century.]
 
 # From Paul Eggert (1993-11-18):
 #
 # Howse writes that Britain was the first country to use standard time.
 # The railways cared most about the inconsistencies of local mean time,
 # and it was they who forced a uniform time on the country.
 # The original idea was credited to Dr. William Hyde Wollaston (1766-1828)
 # and was popularized by Abraham Follett Osler (1808-1903).
 # The first railway to adopt London time was the Great Western Railway
 # in November 1840; other railways followed suit, and by 1847 most
 # (though not all) railways used London time.  On 1847-09-22 the
 # Railway Clearing House, an industry standards body, recommended that GMT be
 # adopted at all stations as soon as the General Post Office permitted it.
 # The transition occurred on 12-01 for the L&NW, the Caledonian,
 # and presumably other railways; the January 1848 Bradshaw's lists many
 # railways as using GMT.  By 1855 the vast majority of public
 # clocks in Britain were set to GMT (though some, like the great clock
 # on Tom Tower at Christ Church, Oxford, were fitted with two minute hands,
 # one for local time and one for GMT).  The last major holdout was the legal
 # system, which stubbornly stuck to local time for many years, leading
 # to oddities like polls opening at 08:13 and closing at 16:13.
 # The legal system finally switched to GMT when the Statutes (Definition
 # of Time) Act took effect; it received the Royal Assent on 1880-08-02.
 #
 # In the tables below, we condense this complicated story into a single
 # transition date for London, namely 1847-12-01.  We don't know as much
 # about Dublin, so we use 1880-08-02, the legal transition time.
 
 # From Paul Eggert (2014-07-19):
 # The ancients had no need for daylight saving, as they kept time
 # informally or via hours whose length depended on the time of year.
 # Daylight saving time in its modern sense was invented by the
 # New Zealand entomologist George Vernon Hudson (1867-1946),
 # whose day job as a postal clerk led him to value
 # after-hours daylight in which to pursue his research.
 # In 1895 he presented a paper to the Wellington Philosophical Society
 # that proposed a two-hour daylight-saving shift.  See:
 # Hudson GV. On seasonal time-adjustment in countries south of lat. 30°.
 # Transactions and Proceedings of the New Zealand Institute. 1895;28:734
 # http://rsnz.natlib.govt.nz/volume/rsnz_28/rsnz_28_00_006110.html
 # Although some interest was expressed in New Zealand, his proposal
 # did not find its way into law and eventually it was almost forgotten.
 #
 # In England, DST was independently reinvented by William Willett (1857-1915),
 # a London builder and member of the Royal Astronomical Society
 # who circulated a pamphlet "The Waste of Daylight" (1907)
 # that proposed advancing clocks 20 minutes on each of four Sundays in April,
 # and retarding them by the same amount on four Sundays in September.
 # A bill was drafted in 1909 and introduced in Parliament several times,
 # but it met with ridicule and opposition, especially from farming interests.
 # Later editions of the pamphlet proposed one-hour summer time, and
 # it was eventually adopted as a wartime measure in 1916.
 # See: Summer Time Arrives Early, The Times (2000-05-18).
 # A monument to Willett was unveiled on 1927-05-21, in an open space in
 # a 45-acre wood near Chislehurst, Kent that was purchased by popular
 # subscription and open to the public.  On the south face of the monolith,
 # designed by G. W. Miller, is the William Willett Memorial Sundial,
 # which is permanently set to Summer Time.
 
 # From Winston Churchill (1934-04-28):
 # It is one of the paradoxes of history that we should owe the boon of
 # summer time, which gives every year to the people of this country
 # between 160 and 170 hours more daylight leisure, to a war which
 # plunged Europe into darkness for four years, and shook the
 # foundations of civilization throughout the world.
 #	-- "A Silent Toast to William Willett", Pictorial Weekly;
 #	republished in Finest Hour (Spring 2002) 1(114):26
 #	https://www.winstonchurchill.org/publications/finest-hour/finest-hour-114/a-silent-toast-to-william-willett-by-winston-s-churchill
 
 # From Paul Eggert (2015-08-08):
 # The OED Supplement says that the English originally said "Daylight Saving"
 # when they were debating the adoption of DST in 1908; but by 1916 this
 # term appears only in quotes taken from DST's opponents, whereas the
 # proponents (who eventually won the argument) are quoted as using "Summer".
 # The term "Summer Time" was introduced by Herbert Samuel, Home Secretary; see:
 # Viscount Samuel. Leisure in a Democracy. Cambridge University Press
 # ISBN 978-1-107-49471-8 (1949, reissued 2015), p 8.
 
 # From Arthur David Olson (1989-01-19):
 # A source at the British Information Office in New York avers that it's
 # known as "British" Summer Time in all parts of the United Kingdom.
 
 # Date: 4 Jan 89 08:57:25 GMT (Wed)
 # From: Jonathan Leffler
 # [British Summer Time] is fixed annually by Act of Parliament.
 # If you can predict what Parliament will do, you should be in
 # politics making a fortune, not computing.
 
 # From Chris Carrier (1996-06-14):
 # I remember reading in various wartime issues of the London Times the
 # acronym BDST for British Double Summer Time.  Look for the published
 # time of sunrise and sunset in The Times, when BDST was in effect, and
 # if you find a zone reference it will say, "All times B.D.S.T."
 
 # From Joseph S. Myers (1999-09-02):
 # ... some military cables (WO 219/4100 - this is a copy from the
 # main SHAEF archives held in the US National Archives, SHAEF/5252/8/516)
 # agree that the usage is BDST (this appears in a message dated 17 Feb 1945).
 
 # From Joseph S. Myers (2000-10-03):
 # On 18th April 1941, Sir Stephen Tallents of the BBC wrote to Sir
 # Alexander Maxwell of the Home Office asking whether there was any
 # official designation; the reply of the 21st was that there wasn't
 # but he couldn't think of anything better than the "Double British
 # Summer Time" that the BBC had been using informally.
 # https://www.polyomino.org.uk/british-time/bbc-19410418.png
 # https://www.polyomino.org.uk/british-time/ho-19410421.png
 
 # From Sir Alexander Maxwell in the above-mentioned letter (1941-04-21):
 # [N]o official designation has as far as I know been adopted for the time
 # which is to be introduced in May....
 # I cannot think of anything better than "Double British Summer Time"
 # which could not be said to run counter to any official description.
 
 # From Paul Eggert (2000-10-02):
 # Howse writes (p 157) 'DBST' too, but 'BDST' seems to have been common
 # and follows the more usual convention of putting the location name first,
 # so we use 'BDST'.
 
 # Peter Ilieve (1998-04-19) described at length
 # the history of summer time legislation in the United Kingdom.
 # Since 1998 Joseph S. Myers has been updating
 # and extending this list, which can be found in
 # https://www.polyomino.org.uk/british-time/
 
 # From Joseph S. Myers (1998-01-06):
 #
 # The legal time in the UK outside of summer time is definitely GMT, not UTC;
 # see Lord Tanlaw's speech
 # https://www.publications.parliament.uk/pa/ld199798/ldhansrd/vo970611/text/70611-10.htm#70611-10_head0
 # (Lords Hansard 11 June 1997 columns 964 to 976).
 
 # From Paul Eggert (2006-03-22):
 #
 # For lack of other data, follow Shanks & Pottenger for Eire in 1940-1948.
 #
 # Given Ilieve and Myers's data, the following claims by Shanks & Pottenger
 # are incorrect:
 #     * Wales did not switch from GMT to daylight saving time until
 #	1921 Apr 3, when they began to conform with the rest of Great Britain.
 # Actually, Wales was identical after 1880.
 #     * Eire had two transitions on 1916 Oct 1.
 # It actually just had one transition.
 #     * Northern Ireland used single daylight saving time throughout WW II.
 # Actually, it conformed to Britain.
 #     * GB-Eire changed standard time to 1 hour ahead of GMT on 1968-02-18.
 # Actually, that date saw the usual switch to summer time.
 # Standard time was not changed until 1968-10-27 (the clocks didn't change).
 #
 # Here is another incorrect claim by Shanks & Pottenger:
 #     * Jersey, Guernsey, and the Isle of Man did not switch from GMT
 #	to daylight saving time until 1921 Apr 3, when they began to
 #	conform with Great Britain.
 # S.R.&O. 1916, No. 382 and HO 45/10811/312364 (quoted above) say otherwise.
 #
 # The following claim by Shanks & Pottenger is possible though doubtful;
 # we'll ignore it for now.
 #     * Dublin's 1971-10-31 switch was at 02:00, even though London's was 03:00.
 
 # From Paul Eggert (2017-12-04):
 #
 # Dunsink Observatory (8 km NW of Dublin's center) was to Dublin as
 # Greenwich was to London.  For example:
 #
 #   "Timeball on the ballast office is down.  Dunsink time."
 #   -- James Joyce, Ulysses
 #
 # The abbreviation DMT stood for "Dublin Mean Time" or "Dunsink Mean Time";
 # this being Ireland, opinions differed.
 #
 # Whitman says Dublin/Dunsink Mean Time was UT-00:25:21, which agrees
 # with measurements of recent visitors to the Meridian Room of Dunsink
 # Observatory; see Malone D. Dunsink and timekeeping. 2016-01-24.
 # .  Malone
 # writes that the Nautical Almanac listed UT-00:25:22 until 1896, when
 # it moved to UT-00:25:21.1 (I confirmed that the 1893 edition used
 # the former and the 1896 edition used the latter).  Evidently the
 # news of this change propagated slowly, as Milne 1899 still lists
 # UT-00:25:22 and cites the International Telegraph Bureau.  As it is
 # not clear that there was any practical significance to the change
 # from UT-00:25:22 to UT-00:25:21.1 in civil timekeeping, omit this
 # transition for now and just use the latter value.
 
 # "Countess Markievicz ... claimed that the [1916] abolition of Dublin Mean Time
 # was among various actions undertaken by the 'English' government that
 # would 'put the whole country into the SF (Sinn Féin) camp'.  She claimed
 # Irish 'public feeling (was) outraged by forcing of English time on us'."
 # -- Parsons M. Dublin lost its time zone - and 25 minutes - after 1916 Rising.
 # Irish Times 2014-10-27.
 # https://www.irishtimes.com/news/politics/dublin-lost-its-time-zone-and-25-minutes-after-1916-rising-1.1977411
 
 # From Joseph S. Myers (2005-01-26):
 # Irish laws are available online at .
 # These include various relating to legal time, for example:
 #
 # ZZA13Y1923.html ZZA12Y1924.html ZZA8Y1925.html ZZSIV20PG1267.html
 #
 # ZZSI71Y1947.html ZZSI128Y1948.html ZZSI23Y1949.html ZZSI41Y1950.html
 # ZZSI27Y1951.html ZZSI73Y1952.html
 #
 # ZZSI11Y1961.html ZZSI232Y1961.html ZZSI182Y1962.html
 # ZZSI167Y1963.html ZZSI257Y1964.html ZZSI198Y1967.html
 # ZZA23Y1968.html ZZA17Y1971.html
 #
 # ZZSI67Y1981.html ZZSI212Y1982.html ZZSI45Y1986.html
 # ZZSI264Y1988.html ZZSI52Y1990.html ZZSI371Y1992.html
 # ZZSI395Y1994.html ZZSI484Y1997.html ZZSI506Y2001.html
 #
 # [These are all relative to the root, e.g., the first is
 # .]
 #
 # (These are those I found, but there could be more.  In any case these
 # should allow various updates to the comments in the europe file to cover
 # the laws applicable in Ireland.)
 #
 # (Note that the time in the Republic of Ireland since 1968 has been defined
 # in terms of standard time being GMT+1 with a period of winter time when it
 # is GMT, rather than standard time being GMT with a period of summer time
 # being GMT+1.)
 
 # From Paul Eggert (1999-03-28):
 # Clive Feather (, 1997-03-31)
 # reports that Folkestone (Cheriton) Shuttle Terminal uses Concession Time
 # (CT), equivalent to French civil time.
 # Julian Hill (, 1998-09-30) reports that
 # trains between Dollands Moor (the freight facility next door)
 # and Frethun run in CT.
 # My admittedly uninformed guess is that the terminal has two authorities,
 # the French concession operators and the British civil authorities,
 # and that the time depends on who you're talking to.
 # If, say, the British police were called to the station for some reason,
 # I would expect the official police report to use GMT/BST and not CET/CEST.
 # This is a borderline case, but for now let's stick to GMT/BST.
 
 # From an anonymous contributor (1996-06-02):
 # The law governing time in Ireland is under Statutory Instrument SI 395/94,
 # which gives force to European Union 7th Council Directive No. 94/21/EC.
 # Under this directive, the Minister for Justice in Ireland makes appropriate
 # regulations. I spoke this morning with the Secretary of the Department of
 # Justice (tel +353 1 678 9711) who confirmed to me that the correct name is
 # "Irish Summer Time", abbreviated to "IST".
 #
 # From Paul Eggert (2017-12-07):
 # The 1996 anonymous contributor's goal was to determine the correct
 # abbreviation for summer time in Dublin and so the contributor
 # focused on the "IST", not on the "Irish Summer Time".  Though the
 # "IST" was correct, the "Irish Summer Time" appears to have been an
 # error, as Ireland's Standard Time (Amendment) Act, 1971 states that
 # standard time in Ireland remains at UT +01 and is observed in
 # summer, and that Greenwich mean time is observed in winter.  (Thanks
 # to Derick Rethans for pointing out the error.)  That is, when
 # Ireland amended the 1968 act that established UT +01 as Irish
 # Standard Time, it left standard time unchanged and established GMT
 # as a negative daylight saving time in winter.  So, in this database
 # IST stands for Irish Summer Time for timestamps before 1968, and for
 # Irish Standard Time after that.  See:
 # http://www.irishstatutebook.ie/eli/1971/act/17/enacted/en/print
 
 # Michael Deckers (2017-06-01) gave the following URLs for Ireland's
 # Summer Time Act, 1925 and Summer Time Orders, 1926 and 1947:
 # http://www.irishstatutebook.ie/eli/1925/act/8/enacted/en/print
 # http://www.irishstatutebook.ie/eli/1926/sro/919/made/en/print
 # http://www.irishstatutebook.ie/eli/1947/sro/71/made/en/print
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Summer Time Act, 1916
 Rule	GB-Eire	1916	only	-	May	21	2:00s	1:00	BST
 Rule	GB-Eire	1916	only	-	Oct	 1	2:00s	0	GMT
 # S.R.&O. 1917, No. 358
 Rule	GB-Eire	1917	only	-	Apr	 8	2:00s	1:00	BST
 Rule	GB-Eire	1917	only	-	Sep	17	2:00s	0	GMT
 # S.R.&O. 1918, No. 274
 Rule	GB-Eire	1918	only	-	Mar	24	2:00s	1:00	BST
 Rule	GB-Eire	1918	only	-	Sep	30	2:00s	0	GMT
 # S.R.&O. 1919, No. 297
 Rule	GB-Eire	1919	only	-	Mar	30	2:00s	1:00	BST
 Rule	GB-Eire	1919	only	-	Sep	29	2:00s	0	GMT
 # S.R.&O. 1920, No. 458
 Rule	GB-Eire	1920	only	-	Mar	28	2:00s	1:00	BST
 # S.R.&O. 1920, No. 1844
 Rule	GB-Eire	1920	only	-	Oct	25	2:00s	0	GMT
 # S.R.&O. 1921, No. 363
 Rule	GB-Eire	1921	only	-	Apr	 3	2:00s	1:00	BST
 Rule	GB-Eire	1921	only	-	Oct	 3	2:00s	0	GMT
 # S.R.&O. 1922, No. 264
 Rule	GB-Eire	1922	only	-	Mar	26	2:00s	1:00	BST
 Rule	GB-Eire	1922	only	-	Oct	 8	2:00s	0	GMT
 # The Summer Time Act, 1922
 Rule	GB-Eire	1923	only	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1923	1924	-	Sep	Sun>=16	2:00s	0	GMT
 Rule	GB-Eire	1924	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1925	1926	-	Apr	Sun>=16	2:00s	1:00	BST
 # The Summer Time Act, 1925
 Rule	GB-Eire	1925	1938	-	Oct	Sun>=2	2:00s	0	GMT
 Rule	GB-Eire	1927	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1928	1929	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1930	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1931	1932	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1933	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1934	only	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1935	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1936	1937	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1938	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1939	only	-	Apr	Sun>=16	2:00s	1:00	BST
 # S.R.&O. 1939, No. 1379
 Rule	GB-Eire	1939	only	-	Nov	Sun>=16	2:00s	0	GMT
 # S.R.&O. 1940, No. 172 and No. 1883
 Rule	GB-Eire	1940	only	-	Feb	Sun>=23	2:00s	1:00	BST
 # S.R.&O. 1941, No. 476
 Rule	GB-Eire	1941	only	-	May	Sun>=2	1:00s	2:00	BDST
 Rule	GB-Eire	1941	1943	-	Aug	Sun>=9	1:00s	1:00	BST
 # S.R.&O. 1942, No. 506
 Rule	GB-Eire	1942	1944	-	Apr	Sun>=2	1:00s	2:00	BDST
 # S.R.&O. 1944, No. 932
 Rule	GB-Eire	1944	only	-	Sep	Sun>=16	1:00s	1:00	BST
 # S.R.&O. 1945, No. 312
 Rule	GB-Eire	1945	only	-	Apr	Mon>=2	1:00s	2:00	BDST
 Rule	GB-Eire	1945	only	-	Jul	Sun>=9	1:00s	1:00	BST
 # S.R.&O. 1945, No. 1208
 Rule	GB-Eire	1945	1946	-	Oct	Sun>=2	2:00s	0	GMT
 Rule	GB-Eire	1946	only	-	Apr	Sun>=9	2:00s	1:00	BST
 # The Summer Time Act, 1947
 Rule	GB-Eire	1947	only	-	Mar	16	2:00s	1:00	BST
 Rule	GB-Eire	1947	only	-	Apr	13	1:00s	2:00	BDST
 Rule	GB-Eire	1947	only	-	Aug	10	1:00s	1:00	BST
 Rule	GB-Eire	1947	only	-	Nov	 2	2:00s	0	GMT
 # Summer Time Order, 1948 (S.I. 1948/495)
 Rule	GB-Eire	1948	only	-	Mar	14	2:00s	1:00	BST
 Rule	GB-Eire	1948	only	-	Oct	31	2:00s	0	GMT
 # Summer Time Order, 1949 (S.I. 1949/373)
 Rule	GB-Eire	1949	only	-	Apr	 3	2:00s	1:00	BST
 Rule	GB-Eire	1949	only	-	Oct	30	2:00s	0	GMT
 # Summer Time Order, 1950 (S.I. 1950/518)
 # Summer Time Order, 1951 (S.I. 1951/430)
 # Summer Time Order, 1952 (S.I. 1952/451)
 Rule	GB-Eire	1950	1952	-	Apr	Sun>=14	2:00s	1:00	BST
 Rule	GB-Eire	1950	1952	-	Oct	Sun>=21	2:00s	0	GMT
 # revert to the rules of the Summer Time Act, 1925
 Rule	GB-Eire	1953	only	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1953	1960	-	Oct	Sun>=2	2:00s	0	GMT
 Rule	GB-Eire	1954	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1955	1956	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1957	only	-	Apr	Sun>=9	2:00s	1:00	BST
 Rule	GB-Eire	1958	1959	-	Apr	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1960	only	-	Apr	Sun>=9	2:00s	1:00	BST
 # Summer Time Order, 1961 (S.I. 1961/71)
 # Summer Time (1962) Order, 1961 (S.I. 1961/2465)
 # Summer Time Order, 1963 (S.I. 1963/81)
 Rule	GB-Eire	1961	1963	-	Mar	lastSun	2:00s	1:00	BST
 Rule	GB-Eire	1961	1968	-	Oct	Sun>=23	2:00s	0	GMT
 # Summer Time (1964) Order, 1963 (S.I. 1963/2101)
 # Summer Time Order, 1964 (S.I. 1964/1201)
 # Summer Time Order, 1967 (S.I. 1967/1148)
 Rule	GB-Eire	1964	1967	-	Mar	Sun>=19	2:00s	1:00	BST
 # Summer Time Order, 1968 (S.I. 1968/117)
 Rule	GB-Eire	1968	only	-	Feb	18	2:00s	1:00	BST
 # The British Standard Time Act, 1968
 #	(no summer time)
 # The Summer Time Act, 1972
 Rule	GB-Eire	1972	1980	-	Mar	Sun>=16	2:00s	1:00	BST
 Rule	GB-Eire	1972	1980	-	Oct	Sun>=23	2:00s	0	GMT
 # Summer Time Order, 1980 (S.I. 1980/1089)
 # Summer Time Order, 1982 (S.I. 1982/1673)
 # Summer Time Order, 1986 (S.I. 1986/223)
 # Summer Time Order, 1988 (S.I. 1988/931)
 Rule	GB-Eire	1981	1995	-	Mar	lastSun	1:00u	1:00	BST
 Rule	GB-Eire 1981	1989	-	Oct	Sun>=23	1:00u	0	GMT
 # Summer Time Order, 1989 (S.I. 1989/985)
 # Summer Time Order, 1992 (S.I. 1992/1729)
 # Summer Time Order 1994 (S.I. 1994/2798)
 Rule	GB-Eire 1990	1995	-	Oct	Sun>=22	1:00u	0	GMT
 # Summer Time Order 1997 (S.I. 1997/2982)
 # See EU for rules starting in 1996.
 #
 # Use Europe/London for Jersey, Guernsey, and the Isle of Man.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/London	-0:01:15 -	LMT	1847 Dec  1
 			 0:00	GB-Eire	%s	1968 Oct 27
 			 1:00	-	BST	1971 Oct 31  2:00u
 			 0:00	GB-Eire	%s	1996
 			 0:00	EU	GMT/BST
 
 # From Paul Eggert (2018-02-15):
 # In January 2018 we discovered that the negative SAVE values in the
 # Eire rules cause problems with tests for ICU:
 # https://mm.icann.org/pipermail/tz/2018-January/025825.html
 # and with tests for OpenJDK:
 # https://mm.icann.org/pipermail/tz/2018-January/025822.html
 #
 # To work around this problem, the build procedure can translate the
 # following data into two forms, one with negative SAVE values and the
 # other form with a traditional approximation for Irish timestamps
 # after 1971-10-31 02:00 UTC; although this approximation has tm_isdst
 # flags that are reversed, its UTC offsets are correct and this often
 # suffices.  This source file currently uses only nonnegative SAVE
 # values, but this is intended to change and downstream code should
 # not rely on it.
 #
 # The following is like GB-Eire and EU, except with standard time in
 # summer and negative daylight saving time in winter.  It is for when
 # negative SAVE values are used.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	-
 Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	-
 Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	-
 Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	-
 Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	-
 Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	-
 Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-0:25:21.1
 Zone	Europe/Dublin	-0:25:21 -	LMT	1880 Aug  2
 			-0:25:21 -	DMT	1916 May 21  2:00s
 			-0:25:21 1:00	IST	1916 Oct  1  2:00s
 			 0:00	GB-Eire	%s	1921 Dec  6 # independence
 			 0:00	GB-Eire	GMT/IST	1940 Feb 25  2:00s
 			 0:00	1:00	IST	1946 Oct  6  2:00s
 			 0:00	-	GMT	1947 Mar 16  2:00s
 			 0:00	1:00	IST	1947 Nov  2  2:00s
 			 0:00	-	GMT	1948 Apr 18  2:00s
 			 0:00	GB-Eire	GMT/IST	1968 Oct 27
 # Vanguard section, for zic and other parsers that support negative DST.
 			 1:00	Eire	IST/GMT
 # Rearguard section, for parsers lacking negative DST; see ziguard.awk.
 #			 1:00	-	IST	1971 Oct 31  2:00u
 #			 0:00	GB-Eire	GMT/IST	1996
 #			 0:00	EU	GMT/IST
 # End of rearguard section.
 
 
 ###############################################################################
 
 # Europe
 
 # The following rules are for the European Union and for its
 # predecessor organization, the European Communities.
 # For brevity they are called "EU rules" elsewhere in this file.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	EU	1977	1980	-	Apr	Sun>=1	 1:00u	1:00	S
 Rule	EU	1977	only	-	Sep	lastSun	 1:00u	0	-
 Rule	EU	1978	only	-	Oct	 1	 1:00u	0	-
 Rule	EU	1979	1995	-	Sep	lastSun	 1:00u	0	-
 Rule	EU	1981	max	-	Mar	lastSun	 1:00u	1:00	S
 Rule	EU	1996	max	-	Oct	lastSun	 1:00u	0	-
 # The most recent directive covers the years starting in 2002.  See:
 # Directive 2000/84/EC of the European Parliament and of the Council
 # of 19 January 2001 on summer-time arrangements.
 # http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32000L0084:EN:NOT
 
 # W-Eur differs from EU only in that W-Eur uses standard time.
 Rule	W-Eur	1977	1980	-	Apr	Sun>=1	 1:00s	1:00	S
 Rule	W-Eur	1977	only	-	Sep	lastSun	 1:00s	0	-
 Rule	W-Eur	1978	only	-	Oct	 1	 1:00s	0	-
 Rule	W-Eur	1979	1995	-	Sep	lastSun	 1:00s	0	-
 Rule	W-Eur	1981	max	-	Mar	lastSun	 1:00s	1:00	S
 Rule	W-Eur	1996	max	-	Oct	lastSun	 1:00s	0	-
 
 # Older C-Eur rules are for convenience in the tables.
 # From 1977 on, C-Eur differs from EU only in that C-Eur uses standard time.
 Rule	C-Eur	1916	only	-	Apr	30	23:00	1:00	S
 Rule	C-Eur	1916	only	-	Oct	 1	 1:00	0	-
 Rule	C-Eur	1917	1918	-	Apr	Mon>=15	 2:00s	1:00	S
 Rule	C-Eur	1917	1918	-	Sep	Mon>=15	 2:00s	0	-
 Rule	C-Eur	1940	only	-	Apr	 1	 2:00s	1:00	S
 Rule	C-Eur	1942	only	-	Nov	 2	 2:00s	0	-
 Rule	C-Eur	1943	only	-	Mar	29	 2:00s	1:00	S
 Rule	C-Eur	1943	only	-	Oct	 4	 2:00s	0	-
 Rule	C-Eur	1944	1945	-	Apr	Mon>=1	 2:00s	1:00	S
 # Whitman gives 1944 Oct 7; go with Shanks & Pottenger.
 Rule	C-Eur	1944	only	-	Oct	 2	 2:00s	0	-
 # From Jesper Nørgaard Welen (2008-07-13):
 #
 # I found what is probably a typo of 2:00 which should perhaps be 2:00s
 # in the C-Eur rule from tz database version 2008d (this part was
 # corrected in version 2008d). The circumstantial evidence is simply the
 # tz database itself, as seen below:
 #
 # Zone Europe/Paris ...
 #    0:00 France WE%sT 1945 Sep 16  3:00
 #
 # Zone Europe/Monaco ...
 #    0:00 France WE%sT 1945 Sep 16  3:00
 #
 # Zone Europe/Belgrade ...
 #    1:00 1:00 CEST 1945 Sep 16  2:00s
 #
 # Rule France 1945 only - Sep 16  3:00 0 -
 # Rule Belgium 1945 only - Sep 16  2:00s 0 -
 # Rule Neth 1945 only - Sep 16 2:00s 0 -
 #
 # The rule line to be changed is:
 #
 # Rule C-Eur 1945 only - Sep 16  2:00 0 -
 #
 # It seems that Paris, Monaco, Rule France, Rule Belgium all agree on
 # 2:00 standard time, e.g. 3:00 local time.  However there are no
 # countries that use C-Eur rules in September 1945, so the only items
 # affected are apparently these fictitious zones that translate acronyms
 # CET and MET:
 #
 # Zone CET  1:00 C-Eur CE%sT
 # Zone MET  1:00 C-Eur ME%sT
 #
 # It this is right then the corrected version would look like:
 #
 # Rule C-Eur 1945 only - Sep 16  2:00s 0 -
 #
 # A small step for mankind though 8-)
 Rule	C-Eur	1945	only	-	Sep	16	 2:00s	0	-
 Rule	C-Eur	1977	1980	-	Apr	Sun>=1	 2:00s	1:00	S
 Rule	C-Eur	1977	only	-	Sep	lastSun	 2:00s	0	-
 Rule	C-Eur	1978	only	-	Oct	 1	 2:00s	0	-
 Rule	C-Eur	1979	1995	-	Sep	lastSun	 2:00s	0	-
 Rule	C-Eur	1981	max	-	Mar	lastSun	 2:00s	1:00	S
 Rule	C-Eur	1996	max	-	Oct	lastSun	 2:00s	0	-
 
 # E-Eur differs from EU only in that E-Eur switches at midnight local time.
 Rule	E-Eur	1977	1980	-	Apr	Sun>=1	 0:00	1:00	S
 Rule	E-Eur	1977	only	-	Sep	lastSun	 0:00	0	-
 Rule	E-Eur	1978	only	-	Oct	 1	 0:00	0	-
 Rule	E-Eur	1979	1995	-	Sep	lastSun	 0:00	0	-
 Rule	E-Eur	1981	max	-	Mar	lastSun	 0:00	1:00	S
 Rule	E-Eur	1996	max	-	Oct	lastSun	 0:00	0	-
 
 
 # Daylight saving time for Russia and the Soviet Union
 #
 # The 1917-1921 decree URLs are from Alexander Belopolsky (2016-08-23).
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Russia	1917	only	-	Jul	 1	23:00	1:00	MST  # Moscow Summer Time
 #
 # Decree No. 142 (1917-12-22) http://istmat.info/node/28137
 Rule	Russia	1917	only	-	Dec	28	 0:00	0	MMT  # Moscow Mean Time
 #
 # Decree No. 497 (1918-05-30) http://istmat.info/node/30001
 Rule	Russia	1918	only	-	May	31	22:00	2:00	MDST # Moscow Double Summer Time
 Rule	Russia	1918	only	-	Sep	16	 1:00	1:00	MST
 #
 # Decree No. 258 (1919-05-29) http://istmat.info/node/37949
 Rule	Russia	1919	only	-	May	31	23:00	2:00	MDST
 #
 Rule	Russia	1919	only	-	Jul	 1	 0:00u	1:00	MSD
 Rule	Russia	1919	only	-	Aug	16	 0:00	0	MSK
 #
 # Decree No. 63 (1921-02-03) http://istmat.info/node/45840
 Rule	Russia	1921	only	-	Feb	14	23:00	1:00	MSD
 #
 # Decree No. 121 (1921-03-07) http://istmat.info/node/45949
 Rule	Russia	1921	only	-	Mar	20	23:00	2:00	+05
 #
 Rule	Russia	1921	only	-	Sep	 1	 0:00	1:00	MSD
 Rule	Russia	1921	only	-	Oct	 1	 0:00	0	-
 # Act No. 925 of the Council of Ministers of the USSR (1980-10-24):
 Rule	Russia	1981	1984	-	Apr	 1	 0:00	1:00	S
 Rule	Russia	1981	1983	-	Oct	 1	 0:00	0	-
 # Act No. 967 of the Council of Ministers of the USSR (1984-09-13), repeated in
 # Act No. 227 of the Council of Ministers of the USSR (1989-03-14):
 Rule	Russia	1984	1995	-	Sep	lastSun	 2:00s	0	-
 Rule	Russia	1985	2010	-	Mar	lastSun	 2:00s	1:00	S
 #
 Rule	Russia	1996	2010	-	Oct	lastSun	 2:00s	0	-
 # As described below, Russia's 2014 change affects Zone data, not Rule data.
 
 # From Stepan Golosunov (2016-03-07):
 # Wikipedia and other sources refer to the Act of the Council of
 # Ministers of the USSR from 1988-01-04 No. 5 and the Act of the
 # Council of Ministers of the USSR from 1989-03-14 No. 227.
 #
 # I did not find full texts of these acts.  For the 1989 one we have
 # title at https://base.garant.ru/70754136/ :
 # "About change in calculation of time on the territories of
 # Lithuanian SSR, Latvian SSR and Estonian SSR, Astrakhan,
 # Kaliningrad, Kirov, Kuybyshev, Ulyanovsk and Uralsk oblasts".
 # And http://astrozet.net/files/Zones/DOC/RU/1980-925.txt appears to
 # contain quotes from both acts: Since last Sunday of March 1988 rules
 # of the second time belt are installed in Volgograd and Saratov
 # oblasts.  Since last Sunday of March 1989:
 # a) Lithuanian SSR, Latvian SSR, Estonian SSR, Kaliningrad oblast:
 # second time belt rules without extra hour (Moscow-1);
 # b) Astrakhan, Kirov, Kuybyshev, Ulyanovsk oblasts: second time belt
 # rules (Moscow time)
 # c) Uralsk oblast: third time belt rules (Moscow+1).
 
 # From Stepan Golosunov (2016-03-27):
 # Unamended version of the act of the
 # Government of the Russian Federation No. 23 from 08.01.1992
 # http://pravo.gov.ru/proxy/ips/?docbody=&nd=102014034&rdk=0
 # says that every year clocks were to be moved forward on last Sunday
 # of March at 2 hours and moved backwards on last Sunday of September
 # at 3 hours.  It was amended in 1996 to replace September with October.
 
 # From Alexander Krivenyshev (2011-06-14):
 # According to Kremlin press service, Russian President Dmitry Medvedev
 # signed a federal law "On calculation of time" on June 9, 2011.
 # According to the law Russia is abolishing daylight saving time.
 #
 # Medvedev signed a law "On the Calculation of Time" (in russian):
 # http://bmockbe.ru/events/?ID=7583
 #
 # Medvedev signed a law on the calculation of the time (in russian):
 # https://www.regnum.ru/news/polit/1413906.html
 
 # From Arthur David Olson (2011-06-15):
 # Take "abolishing daylight saving time" to mean that time is now considered
 # to be standard.
 
 # These are for backward compatibility with older versions.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	WET		0:00	EU	WE%sT
 Zone	CET		1:00	C-Eur	CE%sT
 Zone	MET		1:00	C-Eur	ME%sT
 Zone	EET		2:00	EU	EE%sT
 
 # Previous editions of this database used abbreviations like MET DST
 # for Central European Summer Time, but this didn't agree with common usage.
 
 # From Markus Kuhn (1996-07-12):
 # The official German names ... are
 #
 #	Mitteleuropäische Zeit (MEZ)         = UTC+01:00
 #	Mitteleuropäische Sommerzeit (MESZ)  = UTC+02:00
 #
 # as defined in the German Time Act (Gesetz über die Zeitbestimmung (ZeitG),
 # 1978-07-25, Bundesgesetzblatt, Jahrgang 1978, Teil I, S. 1110-1111)....
 # I wrote ... to the German Federal Physical-Technical Institution
 #
 #	Physikalisch-Technische Bundesanstalt (PTB)
 #	Laboratorium 4.41 "Zeiteinheit"
 #	Postfach 3345
 #	D-38023 Braunschweig
 #	phone: +49 531 592-0
 #
 # ... I received today an answer letter from Dr. Peter Hetzel, head of the PTB
 # department for time and frequency transmission.  He explained that the
 # PTB translates MEZ and MESZ into English as
 #
 #	Central European Time (CET)         = UTC+01:00
 #	Central European Summer Time (CEST) = UTC+02:00
 
 
 # Albania
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Albania	1940	only	-	Jun	16	0:00	1:00	S
 Rule	Albania	1942	only	-	Nov	 2	3:00	0	-
 Rule	Albania	1943	only	-	Mar	29	2:00	1:00	S
 Rule	Albania	1943	only	-	Apr	10	3:00	0	-
 Rule	Albania	1974	only	-	May	 4	0:00	1:00	S
 Rule	Albania	1974	only	-	Oct	 2	0:00	0	-
 Rule	Albania	1975	only	-	May	 1	0:00	1:00	S
 Rule	Albania	1975	only	-	Oct	 2	0:00	0	-
 Rule	Albania	1976	only	-	May	 2	0:00	1:00	S
 Rule	Albania	1976	only	-	Oct	 3	0:00	0	-
 Rule	Albania	1977	only	-	May	 8	0:00	1:00	S
 Rule	Albania	1977	only	-	Oct	 2	0:00	0	-
 Rule	Albania	1978	only	-	May	 6	0:00	1:00	S
 Rule	Albania	1978	only	-	Oct	 1	0:00	0	-
 Rule	Albania	1979	only	-	May	 5	0:00	1:00	S
 Rule	Albania	1979	only	-	Sep	30	0:00	0	-
 Rule	Albania	1980	only	-	May	 3	0:00	1:00	S
 Rule	Albania	1980	only	-	Oct	 4	0:00	0	-
 Rule	Albania	1981	only	-	Apr	26	0:00	1:00	S
 Rule	Albania	1981	only	-	Sep	27	0:00	0	-
 Rule	Albania	1982	only	-	May	 2	0:00	1:00	S
 Rule	Albania	1982	only	-	Oct	 3	0:00	0	-
 Rule	Albania	1983	only	-	Apr	18	0:00	1:00	S
 Rule	Albania	1983	only	-	Oct	 1	0:00	0	-
 Rule	Albania	1984	only	-	Apr	 1	0:00	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Tirane	1:19:20 -	LMT	1914
 			1:00	-	CET	1940 Jun 16
 			1:00	Albania	CE%sT	1984 Jul
 			1:00	EU	CE%sT
 
 # Andorra
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Andorra	0:06:04 -	LMT	1901
 			0:00	-	WET	1946 Sep 30
 			1:00	-	CET	1985 Mar 31  2:00
 			1:00	EU	CE%sT
 
 # Austria
 
 # Milne says Vienna time was 1:05:21.
 
 # From Paul Eggert (2006-03-22): Shanks & Pottenger give 1918-06-16 and
 # 1945-11-18, but the Austrian Federal Office of Metrology and
 # Surveying (BEV) gives 1918-09-16 and for Vienna gives the "alleged"
 # date of 1945-04-12 with no time.  For the 1980-04-06 transition
 # Shanks & Pottenger give 02:00, the BEV 00:00.  Go with the BEV,
 # and guess 02:00 for 1945-04-12.
 
 # From Alois Treindl (2019-07-22):
 # In 1946 the end of DST was on Monday, 7 October 1946, at 3:00 am.
 # Shanks had this right.  Source: Die Weltpresse, 5. Oktober 1946, page 5.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Austria	1920	only	-	Apr	 5	2:00s	1:00	S
 Rule	Austria	1920	only	-	Sep	13	2:00s	0	-
 Rule	Austria	1946	only	-	Apr	14	2:00s	1:00	S
 Rule	Austria	1946	only	-	Oct	 7	2:00s	0	-
 Rule	Austria	1947	1948	-	Oct	Sun>=1	2:00s	0	-
 Rule	Austria	1947	only	-	Apr	 6	2:00s	1:00	S
 Rule	Austria	1948	only	-	Apr	18	2:00s	1:00	S
 Rule	Austria	1980	only	-	Apr	 6	0:00	1:00	S
 Rule	Austria	1980	only	-	Sep	28	0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Vienna	1:05:21 -	LMT	1893 Apr
 			1:00	C-Eur	CE%sT	1920
 			1:00	Austria	CE%sT	1940 Apr  1  2:00s
 			1:00	C-Eur	CE%sT	1945 Apr  2  2:00s
 			1:00	1:00	CEST	1945 Apr 12  2:00s
 			1:00	-	CET	1946
 			1:00	Austria	CE%sT	1981
 			1:00	EU	CE%sT
 
 # Belarus
 #
 # From Stepan Golosunov (2016-07-02):
 # http://www.lawbelarus.com/repub/sub30/texf9611.htm
 # (Act of the Cabinet of Ministers of the Republic of Belarus from
 # 1992-03-25 No. 157) ... says clocks were to be moved forward at 2:00
 # on last Sunday of March and backward at 3:00 on last Sunday of September
 # (the same as previous USSR and contemporary Russian regulations).
 #
 # From Yauhen Kharuzhy (2011-09-16):
 # By latest Belarus government act Europe/Minsk timezone was changed to
 # GMT+3 without DST (was GMT+2 with DST).
 #
 # Sources (Russian language):
 # http://www.belta.by/ru/all_news/society/V-Belarusi-otmenjaetsja-perexod-na-sezonnoe-vremja_i_572952.html
 # http://naviny.by/rubrics/society/2011/09/16/ic_articles_116_175144/
 # https://news.tut.by/society/250578.html
 #
 # From Alexander Bokovoy (2014-10-09):
 # Belarussian government decided against changing to winter time....
 # http://eng.belta.by/all_news/society/Belarus-decides-against-adjusting-time-in-Russias-wake_i_76335.html
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Minsk	1:50:16 -	LMT	1880
 			1:50	-	MMT	1924 May  2 # Minsk Mean Time
 			2:00	-	EET	1930 Jun 21
 			3:00	-	MSK	1941 Jun 28
 			1:00	C-Eur	CE%sT	1944 Jul  3
 			3:00	Russia	MSK/MSD	1990
 			3:00	-	MSK	1991 Mar 31  2:00s
 			2:00	Russia	EE%sT	2011 Mar 27  2:00s
 			3:00	-	+03
 
 # Belgium
 # Luxembourg
 # Netherlands
 #
 # From Michael Deckers (2019-08-25):
 # The exposition in the web page
 # https://www.bestor.be/wiki/index.php/Voyager_dans_le_temps._L%E2%80%99introduction_de_la_norme_de_Greenwich_en_Belgique
 # gives several contemporary sources from which one can conclude that
 # the switch in Europe/Brussels on 1892-05-01 was from 00:17:30 to 00:00:00.
 #
 # From Paul Eggert (2019-08-28):
 # This quote helps explain the late-1914 situation:
 #   In early November 1914, the Germans imposed the time zone used in central
 #   Europe and forced the inhabitants to set their watches and public clocks
 #   sixty minutes ahead.  Many were reluctant to accept "German time" and
 #   continued to use "Belgian time" among themselves.  Reflecting the spirit of
 #   resistance that arose in the population, a song made fun of this change....
 # The song ended:
 #   Putting your clock forward
 #   Will but hasten the happy hour
 #   When we kick out the Boches!
 # See: Pluvinage G. Brussels on German time. Cahiers Bruxellois -
 # Brusselse Cahiers. 2014;XLVI(1E):15-38.
 # https://www.cairn.info/revue-cahiers-bruxellois-2014-1E-page-15.htm
 #
 # Entries from 1914 through 1917 are taken from "De tijd in België"
 # .
 # Entries from 1918 through 1991 are taken from:
 #	Annuaire de L'Observatoire Royal de Belgique,
 #	Avenue Circulaire, 3, B-1180 BRUXELLES, CLVIIe année, 1991
 #	(Imprimerie HAYEZ, s.p.r.l., Rue Fin, 4, 1080 BRUXELLES, MCMXC),
 #	pp 8-9.
 # Thanks to Pascal Delmoitie for the 1918/1991 references.
 # The 1918 rules are listed for completeness; they apply to unoccupied Belgium.
 # Assume Brussels switched to WET in 1918 when the armistice took effect.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Belgium	1918	only	-	Mar	 9	 0:00s	1:00	S
 Rule	Belgium	1918	1919	-	Oct	Sat>=1	23:00s	0	-
 Rule	Belgium	1919	only	-	Mar	 1	23:00s	1:00	S
 Rule	Belgium	1920	only	-	Feb	14	23:00s	1:00	S
 Rule	Belgium	1920	only	-	Oct	23	23:00s	0	-
 Rule	Belgium	1921	only	-	Mar	14	23:00s	1:00	S
 Rule	Belgium	1921	only	-	Oct	25	23:00s	0	-
 Rule	Belgium	1922	only	-	Mar	25	23:00s	1:00	S
 Rule	Belgium	1922	1927	-	Oct	Sat>=1	23:00s	0	-
 Rule	Belgium	1923	only	-	Apr	21	23:00s	1:00	S
 Rule	Belgium	1924	only	-	Mar	29	23:00s	1:00	S
 Rule	Belgium	1925	only	-	Apr	 4	23:00s	1:00	S
 # DSH writes that a royal decree of 1926-02-22 specified the Sun following 3rd
 # Sat in Apr (except if it's Easter, in which case it's one Sunday earlier),
 # to Sun following 1st Sat in Oct, and that a royal decree of 1928-09-15
 # changed the transition times to 02:00 GMT.
 Rule	Belgium	1926	only	-	Apr	17	23:00s	1:00	S
 Rule	Belgium	1927	only	-	Apr	 9	23:00s	1:00	S
 Rule	Belgium	1928	only	-	Apr	14	23:00s	1:00	S
 Rule	Belgium	1928	1938	-	Oct	Sun>=2	 2:00s	0	-
 Rule	Belgium	1929	only	-	Apr	21	 2:00s	1:00	S
 Rule	Belgium	1930	only	-	Apr	13	 2:00s	1:00	S
 Rule	Belgium	1931	only	-	Apr	19	 2:00s	1:00	S
 Rule	Belgium	1932	only	-	Apr	 3	 2:00s	1:00	S
 Rule	Belgium	1933	only	-	Mar	26	 2:00s	1:00	S
 Rule	Belgium	1934	only	-	Apr	 8	 2:00s	1:00	S
 Rule	Belgium	1935	only	-	Mar	31	 2:00s	1:00	S
 Rule	Belgium	1936	only	-	Apr	19	 2:00s	1:00	S
 Rule	Belgium	1937	only	-	Apr	 4	 2:00s	1:00	S
 Rule	Belgium	1938	only	-	Mar	27	 2:00s	1:00	S
 Rule	Belgium	1939	only	-	Apr	16	 2:00s	1:00	S
 Rule	Belgium	1939	only	-	Nov	19	 2:00s	0	-
 Rule	Belgium	1940	only	-	Feb	25	 2:00s	1:00	S
 Rule	Belgium	1944	only	-	Sep	17	 2:00s	0	-
 Rule	Belgium	1945	only	-	Apr	 2	 2:00s	1:00	S
 Rule	Belgium	1945	only	-	Sep	16	 2:00s	0	-
 Rule	Belgium	1946	only	-	May	19	 2:00s	1:00	S
 Rule	Belgium	1946	only	-	Oct	 7	 2:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Brussels	0:17:30 -	LMT	1880
 			0:17:30	-	BMT	1892 May  1 00:17:30
 			0:00	-	WET	1914 Nov  8
 			1:00	-	CET	1916 May  1  0:00
 			1:00	C-Eur	CE%sT	1918 Nov 11 11:00u
 			0:00	Belgium	WE%sT	1940 May 20  2:00s
 			1:00	C-Eur	CE%sT	1944 Sep  3
 			1:00	Belgium	CE%sT	1977
 			1:00	EU	CE%sT
 
 # Bulgaria
 #
 # From Plamen Simenov via Steffen Thorsen (1999-09-09):
 # A document of Government of Bulgaria (No. 94/1997) says:
 # EET -> EETDST is in 03:00 Local time in last Sunday of March ...
 # EETDST -> EET is in 04:00 Local time in last Sunday of October
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Bulg	1979	only	-	Mar	31	23:00	1:00	S
 Rule	Bulg	1979	only	-	Oct	 1	 1:00	0	-
 Rule	Bulg	1980	1982	-	Apr	Sat>=1	23:00	1:00	S
 Rule	Bulg	1980	only	-	Sep	29	 1:00	0	-
 Rule	Bulg	1981	only	-	Sep	27	 2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Sofia	1:33:16 -	LMT	1880
 			1:56:56	-	IMT	1894 Nov 30 # Istanbul MT?
 			2:00	-	EET	1942 Nov  2  3:00
 			1:00	C-Eur	CE%sT	1945
 			1:00	-	CET	1945 Apr  2  3:00
 			2:00	-	EET	1979 Mar 31 23:00
 			2:00	Bulg	EE%sT	1982 Sep 26  3:00
 			2:00	C-Eur	EE%sT	1991
 			2:00	E-Eur	EE%sT	1997
 			2:00	EU	EE%sT
 
 # Cyprus
 # Please see the 'asia' file for Asia/Nicosia.
 
 # Czech Republic (Czechia)
 # Slovakia
 #
 # From Paul Eggert (2018-04-15):
 # The source for Czech data is: Kdy začíná a končí letní čas. 2018-04-15.
 # https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas
 # We know of no English-language name for historical Czech winter time;
 # abbreviate it as "GMT", as it happened to be GMT.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Czech	1945	only	-	Apr	Mon>=1	2:00s	1:00	S
 Rule	Czech	1945	only	-	Oct	 1	2:00s	0	-
 Rule	Czech	1946	only	-	May	 6	2:00s	1:00	S
 Rule	Czech	1946	1949	-	Oct	Sun>=1	2:00s	0	-
 Rule	Czech	1947	1948	-	Apr	Sun>=15	2:00s	1:00	S
 Rule	Czech	1949	only	-	Apr	 9	2:00s	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Prague	0:57:44 -	LMT	1850
 			0:57:44	-	PMT	1891 Oct    # Prague Mean Time
 			1:00	C-Eur	CE%sT	1945 May  9
 			1:00	Czech	CE%sT	1946 Dec  1  3:00
 # Vanguard section, for zic and other parsers that support negative DST.
 			1:00	-1:00	GMT	1947 Feb 23  2:00
 # Rearguard section, for parsers lacking negative DST; see ziguard.awk.
 #			0:00	-	GMT	1947 Feb 23  2:00
 # End of rearguard section.
 			1:00	Czech	CE%sT	1979
 			1:00	EU	CE%sT
 
 # Faroe Is
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/Faroe	-0:27:04 -	LMT	1908 Jan 11 # Tórshavn
 			 0:00	-	WET	1981
 			 0:00	EU	WE%sT
 
 # Greenland
 #
 # From Paul Eggert (2004-10-31):
 # During World War II, Germany maintained secret manned weather stations in
 # East Greenland and Franz Josef Land, but we don't know their time zones.
 # My source for this is Wilhelm Dege's book mentioned under Svalbard.
 #
 # From Paul Eggert (2017-12-10):
 # Greenland joined the European Communities as part of Denmark,
 # obtained home rule on 1979-05-01, and left the European Communities
 # on 1985-02-01.  It therefore should have been using EU
 # rules at least through 1984.  Shanks & Pottenger say Scoresbysund and Godthåb
 # used C-Eur rules after 1980, but IATA SSIM (1991/1996) says they use EU
 # rules since at least 1991.  Assume EU rules since 1980.
 
 # From Gwillim Law (2001-06-06), citing
 #  (2001-03-15),
 # and with translations corrected by Steffen Thorsen:
 #
 # Greenland has four local times, and the relation to UTC
 # is according to the following time line:
 #
 # The military zone near Thule	UTC-4
 # Standard Greenland time	UTC-3
 # Scoresbysund			UTC-1
 # Danmarkshavn			UTC
 #
 # In the military area near Thule and in Danmarkshavn DST will not be
 # introduced.
 
 # From Rives McDow (2001-11-01):
 #
 # I correspond regularly with the Dansk Polarcenter, and wrote them at
 # the time to clarify the situation in Thule.  Unfortunately, I have
 # not heard back from them regarding my recent letter.  [But I have
 # info from earlier correspondence.]
 #
 # According to the center, a very small local time zone around Thule
 # Air Base keeps the time according to UTC-4, implementing daylight
 # savings using North America rules, changing the time at 02:00 local time....
 #
 # The east coast of Greenland north of the community of Scoresbysund
 # uses UTC in the same way as in Iceland, year round, with no dst.
 # There are just a few stations on this coast, including the
 # Danmarkshavn ICAO weather station mentioned in your September 29th
 # email.  The other stations are two sledge patrol stations in
 # Mestersvig and Daneborg, the air force base at Station Nord, and the
 # DPC research station at Zackenberg.
 #
 # Scoresbysund and two small villages nearby keep time UTC-1 and use
 # the same daylight savings time period as in West Greenland (Godthåb).
 #
 # The rest of Greenland, including Godthåb (this area, although it
 # includes central Greenland, is known as west Greenland), keeps time
 # UTC-3, with daylight savings methods according to European rules.
 #
 # It is common procedure to use UTC 0 in the wilderness of East and
 # North Greenland, because it is mainly Icelandic aircraft operators
 # maintaining traffic in these areas.  However, the official status of
 # this area is that it sticks with Godthåb time.  This area might be
 # considered a dual time zone in some respects because of this.
 
 # From Rives McDow (2001-11-19):
 # I heard back from someone stationed at Thule; the time change took place
 # there at 2:00 AM.
 
 # From Paul Eggert (2006-03-22):
 # From 1997 on the CIA map shows Danmarkshavn on GMT;
 # the 1995 map as like Godthåb.
 # For lack of better info, assume they were like Godthåb before 1996.
 # startkart.no says Thule does not observe DST, but this is clearly an error,
 # so go with Shanks & Pottenger for Thule transitions until this year.
 # For 2007 on assume Thule will stay in sync with US DST rules.
 
 # From J William Piggott (2016-02-20):
 # "Greenland north of the community of Scoresbysund" is officially named
 # "National Park" by Executive Order:
 # http://naalakkersuisut.gl/~/media/Nanoq/Files/Attached%20Files/Engelske-tekster/Legislation/Executive%20Order%20National%20Park.rtf
 # It is their only National Park.
-#
+
+# From Jonas Nyrup (2022-11-24):
+# On last Saturday in October 2023 when DST ends America/Nuuk will switch
+# from -03/-02 to -02/-01
+# https://sermitsiaq.ag/forslagtidsforskel-danmark-mindskes-sommertid-beholdes
+# ...
+# https://sermitsiaq.ag/groenland-skifte-tidszone-trods-bekymringer
+#
+# From Jürgen Appel (2022-11-25):
+# https://ina.gl/samlinger/oversigt-over-samlinger/samling/dagsordener/dagsorden.aspx?lang=da&day=24-11-2022
+# If I understand this correctly, from the next planned switch to
+# summer time, Greenland will permanently stay at that time, i.e. no
+# switch back to winter time in 2023 will occur.
+#
+# From Paul Eggert (2022-11-28):
+# The official document in Danish
+# https://naalakkersuisut.gl/-/media/naalakkersuisut/filer/kundgoerelser/2022/11/2511/31_da_inatsisartutlov-om-tidens-bestemmelse.pdf?la=da&hash=A33597D8A38CC7038465241119EF34F3
+# says standard time for Greenland is -02, that Naalakkersuisut can lay down
+# rules for DST and can require some areas to use a different time zone,
+# and that this all takes effect 2023-03-25 22:00.  The abovementioned
+# "bekymringer" URL says the intent is no transition March 25, that
+# Greenland will not go back to winter time in fall 2023, and that
+# only America/Nuuk is affected (though further changes may occur).
+
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Thule	1991	1992	-	Mar	lastSun	2:00	1:00	D
 Rule	Thule	1991	1992	-	Sep	lastSun	2:00	0	S
 Rule	Thule	1993	2006	-	Apr	Sun>=1	2:00	1:00	D
 Rule	Thule	1993	2006	-	Oct	lastSun	2:00	0	S
 Rule	Thule	2007	max	-	Mar	Sun>=8	2:00	1:00	D
 Rule	Thule	2007	max	-	Nov	Sun>=1	2:00	0	S
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Danmarkshavn -1:14:40 -	LMT	1916 Jul 28
 			-3:00	-	-03	1980 Apr  6  2:00
 			-3:00	EU	-03/-02	1996
 			0:00	-	GMT
 #
 # Use the old name Scoresbysund, as the current name Ittoqqortoormiit
 # exceeds tzdb's 14-letter limit and has no common English abbreviation.
 Zone America/Scoresbysund -1:27:52 -	LMT	1916 Jul 28 # Ittoqqortoormiit
 			-2:00	-	-02	1980 Apr  6  2:00
 			-2:00	C-Eur	-02/-01	1981 Mar 29
 			-1:00	EU	-01/+00
 Zone America/Nuuk	-3:26:56 -	LMT	1916 Jul 28 # Godthåb
 			-3:00	-	-03	1980 Apr  6  2:00
-			-3:00	EU	-03/-02
+			-3:00	EU	-03/-02	2023 Mar 25 22:00
+			-2:00	-	-02
 Zone America/Thule	-4:35:08 -	LMT	1916 Jul 28 # Pituffik
 			-4:00	Thule	A%sT
 
 # Estonia
 #
 # From Paul Eggert (2016-03-18):
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 #
 # From Peter Ilieve (1994-10-15):
 # A relative in Tallinn confirms the accuracy of the data for 1989 onwards
 # [through 1994] and gives the legal authority for it,
 # a regulation of the Government of Estonia, No. 111 of 1989....
 #
 # From Peter Ilieve (1996-10-28):
 # [IATA SSIM (1992/1996) claims that the Baltic republics switch at 01:00s,
 # but a relative confirms that Estonia still switches at 02:00s, writing:]
 # "I do not [know] exactly but there are some little different
 # (confusing) rules for International Air and Railway Transport Schedules
 # conversion in Sunday connected with end of summer time in Estonia....
 # A discussion is running about the summer time efficiency and effect on
 # human physiology.  It seems that Estonia maybe will not change to
 # summer time next spring."
 
 # From Peter Ilieve (1998-11-04), heavily edited:
 # The 1998-09-22 Estonian time law
 # http://trip.rk.ee/cgi-bin/thw?${BASE}=akt&${OOHTML}=rtd&TA=1998&TO=1&AN=1390
 # refers to the Eighth Directive and cites the association agreement between
 # the EU and Estonia, ratified by the Estonian law (RT II 1995, 22-27, 120).
 #
 # I also asked [my relative] whether they use any standard abbreviation
 # for their standard and summer times. He says no, they use "suveaeg"
 # (summer time) and "talveaeg" (winter time).
 
 # From The Baltic Times  (1999-09-09)
 # via Steffen Thorsen:
 # This year will mark the last time Estonia shifts to summer time,
 # a council of the ruling coalition announced Sept. 6....
 # But what this could mean for Estonia's chances of joining the European
 # Union are still unclear.  In 1994, the EU declared summer time compulsory
 # for all member states until 2001.  Brussels has yet to decide what to do
 # after that.
 
 # From Mart Oruaas (2000-01-29):
 # Regulation No. 301 (1999-10-12) obsoletes previous regulation
 # No. 206 (1998-09-22) and thus sticks Estonia to +02:00 GMT for all
 # the year round.  The regulation is effective 1999-11-01.
 
 # From Toomas Soome (2002-02-21):
 # The Estonian government has changed once again timezone politics.
 # Now we are using again EU rules.
 #
 # From Urmet Jänes (2002-03-28):
 # The legislative reference is Government decree No. 84 on 2002-02-21.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Tallinn	1:39:00	-	LMT	1880
 			1:39:00	-	TMT	1918 Feb    # Tallinn Mean Time
 			1:00	C-Eur	CE%sT	1919 Jul
 			1:39:00	-	TMT	1921 May
 			2:00	-	EET	1940 Aug  6
 			3:00	-	MSK	1941 Sep 15
 			1:00	C-Eur	CE%sT	1944 Sep 22
 			3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
 			2:00	1:00	EEST	1989 Sep 24  2:00s
 			2:00	C-Eur	EE%sT	1998 Sep 22
 			2:00	EU	EE%sT	1999 Oct 31  4:00
 			2:00	-	EET	2002 Feb 21
 			2:00	EU	EE%sT
 
 # Finland
 
 # From Hannu Strang (1994-09-25 06:03:37 UTC):
 # Well, here in Helsinki we're just changing from summer time to regular one,
 # and it's supposed to change at 4am...
 
 # From Janne Snabb (2010-07-15):
 #
 # I noticed that the Finland data is not accurate for years 1981 and 1982.
 # During these two first trial years the DST adjustment was made one hour
 # earlier than in forthcoming years. Starting 1983 the adjustment was made
 # according to the central European standards.
 #
 # This is documented in Heikki Oja: Aikakirja 2007, published by The Almanac
 # Office of University of Helsinki, ISBN 952-10-3221-9, available online (in
 # Finnish) at
 # https://almanakka.helsinki.fi/aikakirja/Aikakirja2007kokonaan.pdf
 #
 # Page 105 (56 in PDF version) has a handy table of all past daylight savings
 # transitions. It is easy enough to interpret without Finnish skills.
 #
 # This is also confirmed by Finnish Broadcasting Company's archive at:
 # http://www.yle.fi/elavaarkisto/?s=s&g=1&ag=5&t=&a=3401
 #
 # The news clip from 1981 says that "the time between 2 and 3 o'clock does not
 # exist tonight."
 
 # From Konstantin Hyppönen (2014-06-13):
 # [Heikki Oja's book Aikakirja 2013]
 # https://almanakka.helsinki.fi/images/aikakirja/Aikakirja2013kokonaan.pdf
 # pages 104-105, including a scan from a newspaper published on Apr 2 1942
 # say that ... [o]n Apr 2 1942, 24 o'clock (which means Apr 3 1942,
 # 00:00), clocks were moved one hour forward. The newspaper
 # mentions "on the night from Thursday to Friday"....
 # On Oct 4 1942, clocks were moved at 1:00 one hour backwards.
 #
 # From Paul Eggert (2014-06-14):
 # Go with Oja over Shanks.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Finland	1942	only	-	Apr	2	24:00	1:00	S
 Rule	Finland	1942	only	-	Oct	4	1:00	0	-
 Rule	Finland	1981	1982	-	Mar	lastSun	2:00	1:00	S
 Rule	Finland	1981	1982	-	Sep	lastSun	3:00	0	-
 
 # Milne says Helsinki (Helsingfors) time was 1:39:49.2 (official document).
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	1:39:49.2
 Zone	Europe/Helsinki	1:39:49 -	LMT	1878 May 31
 			1:39:49	-	HMT	1921 May    # Helsinki Mean Time
 			2:00	Finland	EE%sT	1983
 			2:00	EU	EE%sT
 
 # France
 # Monaco
 
 # From Ciro Discepolo (2000-12-20):
 #
 # Henri Le Corre, Régimes horaires pour le monde entier, Éditions
 # Traditionnelles - Paris 2 books, 1993
 #
 # Gabriel, Traité de l'heure dans le monde, Guy Trédaniel,
 # Paris, 1991
 #
 # Françoise Gauquelin, Problèmes de l'heure résolus en astrologie,
 # Guy Trédaniel, Paris 1987
 
 # From Michael Deckers (2020-06-11):
 # the law of 1891 
 # was published on 1891-03-15, so it could only take force on 1891-03-16.
 
 # From Michael Deckers (2020-06-10):
 # Le Gaulois, 1911-03-11, page 1/6, online at
 # https://www.retronews.fr/societe/echo-de-presse/2018/01/29/1911-change-lheure-de-paris
 # ... [ Instantly, all pressure driven clock dials halted...  Nine minutes and
 #       twenty-one seconds later the hands resumed their circular motion. ]
 # There are also precise reports about how the change was prepared in train
 # stations: all the publicly visible clocks stopped at midnight railway time
 # (or were covered), only the chief of service had a watch, labeled
 # "Heure ancienne", that he kept running until it reached 00:04:21, when
 # he announced "Heure nouvelle".  See the "Le Petit Journal 1911-03-11".
 # https://gallica.bnf.fr/ark:/12148/bpt6k6192911/f1.item.zoom
 #
 # From Michael Deckers (2020-06-12):
 # That "all French clocks stopped" for 00:09:21 is a misreading of French
 # newspapers; this sort of adjustment applies only to certain
 # remote-controlled clocks ("pendules pneumatiques", of which there existed
 # perhaps a dozen in Paris, and which simply could not be set back remotely),
 # but not to all the clocks in all French towns and villages.  For instance,
 # the following story in the "Courrier de Saône-et-Loire" 1911-03-11, page 2:
 # only works if legal time was stepped back (was not monotone): ...
 #   [One can observe that children who had been born at midnight less 5
 #    minutes and who had died at midnight of the old time, would turn out to
 #    be dead before being born, time having been set back and having
 #    suppressed 9 minutes and 25 seconds of their existence, that is, more
 #    than they could spend.]
 #
 # From Paul Eggert (2020-06-12):
 # French time in railway stations was legally five minutes behind civil time,
 # which explains why railway "old time" ran to 00:04:21 instead of to 00:09:21.
 # The law's text (which Michael Deckers noted is at
 # ) says only that
 # at 1911-03-11 00:00 legal time was that of Paris mean time delayed by
 # nine minutes and twenty-one seconds, and does not say how the
 # transition from Paris mean time was to occur.
 #
 # tzdb has no way to represent stopped clocks.  As the railway practice
 # was to keep a watch running on "old time" to decide when to restart
 # the other clocks, this could be modeled as a transition for "old time" at
 # 00:09:21.  However, since the law was ambiguous and clocks outside railway
 # stations were probably done haphazardly with the popular impression being
 # that the transition was done at 00:00 "old time", simply leave the time
 # blank; this causes zic to default to 00:00 "old time" which is good enough.
 # Do something similar for the 1891-03-16 transition.  There are similar
 # problems in Algiers, Monaco and Tunis.
 
 #
 # Shank & Pottenger seem to use '24:00' ambiguously; resolve it with Whitman.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	France	1916	only	-	Jun	14	23:00s	1:00	S
 Rule	France	1916	1919	-	Oct	Sun>=1	23:00s	0	-
 Rule	France	1917	only	-	Mar	24	23:00s	1:00	S
 Rule	France	1918	only	-	Mar	 9	23:00s	1:00	S
 Rule	France	1919	only	-	Mar	 1	23:00s	1:00	S
 Rule	France	1920	only	-	Feb	14	23:00s	1:00	S
 Rule	France	1920	only	-	Oct	23	23:00s	0	-
 Rule	France	1921	only	-	Mar	14	23:00s	1:00	S
 Rule	France	1921	only	-	Oct	25	23:00s	0	-
 Rule	France	1922	only	-	Mar	25	23:00s	1:00	S
 # DSH writes that a law of 1923-05-24 specified 3rd Sat in Apr at 23:00 to 1st
 # Sat in Oct at 24:00; and that in 1930, because of Easter, the transitions
 # were Apr 12 and Oct 5.  Go with Shanks & Pottenger.
 Rule	France	1922	1938	-	Oct	Sat>=1	23:00s	0	-
 Rule	France	1923	only	-	May	26	23:00s	1:00	S
 Rule	France	1924	only	-	Mar	29	23:00s	1:00	S
 Rule	France	1925	only	-	Apr	 4	23:00s	1:00	S
 Rule	France	1926	only	-	Apr	17	23:00s	1:00	S
 Rule	France	1927	only	-	Apr	 9	23:00s	1:00	S
 Rule	France	1928	only	-	Apr	14	23:00s	1:00	S
 Rule	France	1929	only	-	Apr	20	23:00s	1:00	S
 Rule	France	1930	only	-	Apr	12	23:00s	1:00	S
 Rule	France	1931	only	-	Apr	18	23:00s	1:00	S
 Rule	France	1932	only	-	Apr	 2	23:00s	1:00	S
 Rule	France	1933	only	-	Mar	25	23:00s	1:00	S
 Rule	France	1934	only	-	Apr	 7	23:00s	1:00	S
 Rule	France	1935	only	-	Mar	30	23:00s	1:00	S
 Rule	France	1936	only	-	Apr	18	23:00s	1:00	S
 Rule	France	1937	only	-	Apr	 3	23:00s	1:00	S
 Rule	France	1938	only	-	Mar	26	23:00s	1:00	S
 Rule	France	1939	only	-	Apr	15	23:00s	1:00	S
 Rule	France	1939	only	-	Nov	18	23:00s	0	-
 Rule	France	1940	only	-	Feb	25	 2:00	1:00	S
 # The French rules for 1941-1944 were not used in Paris, but Shanks & Pottenger
 # write that they were used in Monaco and in many French locations.
 # Le Corre writes that the upper limit of the free zone was Arnéguy, Orthez,
 # Mont-de-Marsan, Bazas, Langon, Lamothe-Montravel, Marœuil, La
 # Rochefoucauld, Champagne-Mouton, La Roche-Posay, La Haye-Descartes,
 # Loches, Montrichard, Vierzon, Bourges, Moulins, Digoin,
 # Paray-le-Monial, Montceau-les-Mines, Chalon-sur-Saône, Arbois,
 # Dole, Morez, St-Claude, and Collonges (Haute-Savoie).
 Rule	France	1941	only	-	May	 5	 0:00	2:00	M # Midsummer
 # Shanks & Pottenger say this transition occurred at Oct 6 1:00,
 # but go with Denis Excoffier (1997-12-12),
 # who quotes the Ephémérides astronomiques for 1998 from Bureau des Longitudes
 # as saying 5/10/41 22hUT.
 Rule	France	1941	only	-	Oct	 6	 0:00	1:00	S
 Rule	France	1942	only	-	Mar	 9	 0:00	2:00	M
 Rule	France	1942	only	-	Nov	 2	 3:00	1:00	S
 Rule	France	1943	only	-	Mar	29	 2:00	2:00	M
 Rule	France	1943	only	-	Oct	 4	 3:00	1:00	S
 Rule	France	1944	only	-	Apr	 3	 2:00	2:00	M
 Rule	France	1944	only	-	Oct	 8	 1:00	1:00	S
 Rule	France	1945	only	-	Apr	 2	 2:00	2:00	M
 Rule	France	1945	only	-	Sep	16	 3:00	0	-
 # Shanks & Pottenger give Mar 28 2:00 and Sep 26 3:00;
 # go with Excoffier's 28/3/76 0hUT and 25/9/76 23hUT.
 Rule	France	1976	only	-	Mar	28	 1:00	1:00	S
 Rule	France	1976	only	-	Sep	26	 1:00	0	-
 # Howse writes that the time in France was officially based
 # on PMT-0:09:21 until 1978-08-09, when the time base finally switched to UTC.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Paris	0:09:21 -	LMT	1891 Mar 16
 			0:09:21	-	PMT	1911 Mar 11 # Paris Mean Time
 # Shanks & Pottenger give 1940 Jun 14 0:00; go with Excoffier and Le Corre.
 			0:00	France	WE%sT	1940 Jun 14 23:00
 # Le Corre says Paris stuck with occupied-France time after the liberation;
 # go with Shanks & Pottenger.
 			1:00	C-Eur	CE%sT	1944 Aug 25
 			0:00	France	WE%sT	1945 Sep 16  3:00
 			1:00	France	CE%sT	1977
 			1:00	EU	CE%sT
 
 # Denmark
 # Germany
 # Norway
 # Sweden
 
 # From Markus Kuhn (1998-09-29):
 # The German time zone web site by the Physikalisch-Technische
 # Bundesanstalt contains DST information back to 1916.
 # [See tz-link.html for the URL.]
 
 # From Jörg Schilling (2002-10-23):
 # In 1945, Berlin was switched to Moscow Summer time (GMT+4) by
 # https://www.dhm.de/lemo/html/biografien/BersarinNikolai/
 # General [Nikolai] Bersarin.
 
 # From Paul Eggert (2003-03-08):
 # http://www.parlament-berlin.de/pds-fraktion.nsf/727459127c8b66ee8525662300459099/defc77cb784f180ac1256c2b0030274b/$FILE/bersarint.pdf
 # says that Bersarin issued an order to use Moscow time on May 20.
 # However, Moscow did not observe daylight saving in 1945, so
 # this was equivalent to UT +03, not +04.
 
 # Svalbard & Jan Mayen
 
 # From Steffen Thorsen (2001-05-01):
 # Although I could not find it explicitly, it seems that Jan Mayen and
 # Svalbard have been using the same time as Norway at least since the
 # time they were declared as parts of Norway.  Svalbard was declared
 # as a part of Norway by law of 1925-07-17 no 11, section 4 and Jan
 # Mayen by law of 1930-02-27 no 2, section 2. (From
 #  and
 # ).  The law/regulation
 # for normal/standard time in Norway is from 1894-06-29 no 1 (came
 # into operation on 1895-01-01) and Svalbard/Jan Mayen seem to be a
 # part of this law since 1925/1930. (From
 # ) I have not been
 # able to find if Jan Mayen used a different time zone (e.g. -0100)
 # before 1930. Jan Mayen has only been "inhabited" since 1921 by
 # Norwegian meteorologists and maybe used the same time as Norway ever
 # since 1921.  Svalbard (Arctic/Longyearbyen) has been inhabited since
 # before 1895, and therefore probably changed the local time somewhere
 # between 1895 and 1925 (inclusive).
 
 # From Paul Eggert (2013-09-04):
 #
 # Actually, Jan Mayen was never occupied by Germany during World War II,
 # so it must have diverged from Oslo time during the war, as Oslo was
 # keeping Berlin time.
 #
 #  says that the meteorologists
 # burned down their station in 1940 and left the island, but returned in
 # 1941 with a small Norwegian garrison and continued operations despite
 # frequent air attacks from Germans.  In 1943 the Americans established a
 # radiolocating station on the island, called "Atlantic City".  Possibly
 # the UT offset changed during the war, but I think it unlikely that
 # Jan Mayen used German daylight-saving rules.
 #
 # Svalbard is more complicated, as it was raided in August 1941 by an
 # Allied party that evacuated the civilian population to England (says
 # ).  The Svalbard FAQ
 #  says that the Germans were
 # expelled on 1942-05-14.  However, small parties of Germans did return,
 # and according to Wilhelm Dege's book "War North of 80" (1954)
 # http://www.ucalgary.ca/UofC/departments/UP/1-55238/1-55238-110-2.html
 # the German armed forces at the Svalbard weather station code-named
 # Haudegen did not surrender to the Allies until September 1945.
 #
 # All these events predate our cutoff date of 1970, so use Europe/Berlin
 # for these regions.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Germany	1946	only	-	Apr	14	2:00s	1:00	S
 Rule	Germany	1946	only	-	Oct	 7	2:00s	0	-
 Rule	Germany	1947	1949	-	Oct	Sun>=1	2:00s	0	-
 # http://www.ptb.de/de/org/4/44/441/salt.htm says the following transition
 # occurred at 3:00 MEZ, not the 2:00 MEZ given in Shanks & Pottenger.
 # Go with the PTB.
 Rule	Germany	1947	only	-	Apr	 6	3:00s	1:00	S
 Rule	Germany	1947	only	-	May	11	2:00s	2:00	M
 Rule	Germany	1947	only	-	Jun	29	3:00	1:00	S
 Rule	Germany	1948	only	-	Apr	18	2:00s	1:00	S
 Rule	Germany	1949	only	-	Apr	10	2:00s	1:00	S
 
 Rule SovietZone	1945	only	-	May	24	2:00	2:00	M # Midsummer
 Rule SovietZone	1945	only	-	Sep	24	3:00	1:00	S
 Rule SovietZone	1945	only	-	Nov	18	2:00s	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Berlin	0:53:28 -	LMT	1893 Apr
 			1:00	C-Eur	CE%sT	1945 May 24  2:00
 			1:00 SovietZone	CE%sT	1946
 			1:00	Germany	CE%sT	1980
 			1:00	EU	CE%sT
 
 # Georgia
 # Please see the "asia" file for Asia/Tbilisi.
 # Herodotus (Histories, IV.45) says Georgia north of the Phasis (now Rioni)
 # is in Europe.  Our reference location Tbilisi is in the Asian part.
 
 # Gibraltar
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Gibraltar	-0:21:24 -	LMT	1880 Aug  2
 			0:00	GB-Eire	%s	1957 Apr 14  2:00
 			1:00	-	CET	1982
 			1:00	EU	CE%sT
 
 # Greece
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Whitman gives 1932 Jul 5 - Nov 1; go with Shanks & Pottenger.
 Rule	Greece	1932	only	-	Jul	 7	0:00	1:00	S
 Rule	Greece	1932	only	-	Sep	 1	0:00	0	-
 # Whitman gives 1941 Apr 25 - ?; go with Shanks & Pottenger.
 Rule	Greece	1941	only	-	Apr	 7	0:00	1:00	S
 # Whitman gives 1942 Feb 2 - ?; go with Shanks & Pottenger.
 Rule	Greece	1942	only	-	Nov	 2	3:00	0	-
 Rule	Greece	1943	only	-	Mar	30	0:00	1:00	S
 Rule	Greece	1943	only	-	Oct	 4	0:00	0	-
 # Whitman gives 1944 Oct 3 - Oct 31; go with Shanks & Pottenger.
 Rule	Greece	1952	only	-	Jul	 1	0:00	1:00	S
 Rule	Greece	1952	only	-	Nov	 2	0:00	0	-
 Rule	Greece	1975	only	-	Apr	12	0:00s	1:00	S
 Rule	Greece	1975	only	-	Nov	26	0:00s	0	-
 Rule	Greece	1976	only	-	Apr	11	2:00s	1:00	S
 Rule	Greece	1976	only	-	Oct	10	2:00s	0	-
 Rule	Greece	1977	1978	-	Apr	Sun>=1	2:00s	1:00	S
 Rule	Greece	1977	only	-	Sep	26	2:00s	0	-
 Rule	Greece	1978	only	-	Sep	24	4:00	0	-
 Rule	Greece	1979	only	-	Apr	 1	9:00	1:00	S
 Rule	Greece	1979	only	-	Sep	29	2:00	0	-
 Rule	Greece	1980	only	-	Apr	 1	0:00	1:00	S
 Rule	Greece	1980	only	-	Sep	28	0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Athens	1:34:52 -	LMT	1895 Sep 14
 			1:34:52	-	AMT	1916 Jul 28  0:01 # Athens MT
 			2:00	Greece	EE%sT	1941 Apr 30
 			1:00	Greece	CE%sT	1944 Apr  4
 			2:00	Greece	EE%sT	1981
 			# Shanks & Pottenger say it switched to C-Eur in 1981;
 			# go with EU rules instead, since Greece joined Jan 1.
 			2:00	EU	EE%sT
 
 # Hungary
 
 # From Michael Deckers (2020-06-09):
 # an Austrian encyclopedia of railroads of 1913, online at
 # http://www.zeno.org/Roell-1912/A/Eisenbahnzeit
 # says that the switch [to CET] happened on 1890-11-01.
 
 # From Géza Nyáry (2020-06-07):
 # Data for 1918-1983 are based on the archive database of Library Hungaricana.
 # The dates are collected from original, scanned governmental orders,
 # bulletins, instructions and public press.
 # [See URLs below.]
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1918/?pg=238
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1919/?pg=808
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1920/?pg=201
 Rule	Hungary	1918	1919	-	Apr	15	 2:00	1:00	S
 Rule	Hungary	1918	1920	-	Sep	Mon>=15	 3:00	0	-
 Rule	Hungary	1920	only	-	Apr	 5	 2:00	1:00	S
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1945/?pg=882
 Rule	Hungary	1945	only	-	May	 1	23:00	1:00	S
 Rule	Hungary	1945	only	-	Nov	 1	 1:00	0	-
 # https://library.hungaricana.hu/hu/view/Delmagyarorszag_1946_03/?pg=49
 Rule	Hungary	1946	only	-	Mar	31	 2:00s	1:00	S
 # https://library.hungaricana.hu/hu/view/Delmagyarorszag_1946_09/?pg=54
 Rule	Hungary	1946	only	-	Oct	 7	 2:00	0	-
 # https://library.hungaricana.hu/hu/view/KulfBelfHirek_1947_04_1__001-123/?pg=90
 # https://library.hungaricana.hu/hu/view/DunantuliNaplo_1947_09/?pg=128
 # https://library.hungaricana.hu/hu/view/KulfBelfHirek_1948_03_3__001-123/?pg=304
 # https://library.hungaricana.hu/hu/view/Zala_1948_09/?pg=64
 # https://library.hungaricana.hu/hu/view/SatoraljaujhelyiLeveltar_ZempleniNepujsag_1948/?pg=53
 # https://library.hungaricana.hu/hu/view/SatoraljaujhelyiLeveltar_ZempleniNepujsag_1948/?pg=160
 # https://library.hungaricana.hu/hu/view/UjSzo_1949_01-04/?pg=102
 # https://library.hungaricana.hu/hu/view/KeletMagyarorszag_1949_03/?pg=96
 # https://library.hungaricana.hu/hu/view/Delmagyarorszag_1949_09/?pg=94
 Rule	Hungary	1947	1949	-	Apr	Sun>=4	 2:00s	1:00	S
 Rule	Hungary	1947	1949	-	Oct	Sun>=1	 2:00s	0	-
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1954/?pg=513
 Rule	Hungary	1954	only	-	May	23	 0:00	1:00	S
 Rule	Hungary	1954	only	-	Oct	 3	 0:00	0	-
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1955/?pg=398
 Rule	Hungary	1955	only	-	May	22	 2:00	1:00	S
 Rule	Hungary	1955	only	-	Oct	 2	 3:00	0	-
 # https://library.hungaricana.hu/hu/view/HevesMegyeiNepujsag_1956_06/?pg=0
 # https://library.hungaricana.hu/hu/view/EszakMagyarorszag_1956_06/?pg=6
 # https://library.hungaricana.hu/hu/view/SzolnokMegyeiNeplap_1957_04/?pg=120
 # https://library.hungaricana.hu/hu/view/PestMegyeiHirlap_1957_09/?pg=143
 Rule	Hungary	1956	1957	-	Jun	Sun>=1	 2:00	1:00	S
 Rule	Hungary	1956	1957	-	Sep	lastSun	 3:00	0	-
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1980/?pg=189
 Rule	Hungary	1980	only	-	Apr	 6	 0:00	1:00	S
 Rule	Hungary	1980	only	-	Sep	28	 1:00	0	-
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1980/?pg=1227
 # https://library.hungaricana.hu/hu/view/Delmagyarorszag_1981_01/?pg=79
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1982/?pg=115
 # https://library.hungaricana.hu/hu/view/DTT_KOZL_TanacsokKozlonye_1983/?pg=85
 Rule	Hungary	1981	1983	-	Mar	lastSun	 0:00	1:00	S
 Rule	Hungary	1981	1983	-	Sep	lastSun	 1:00	0	-
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Budapest	1:16:20 -	LMT	1890 Nov  1
 			1:00	C-Eur	CE%sT	1918
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1941/?pg=1204
 # https://library.hungaricana.hu/hu/view/OGYK_RT_1942/?pg=3955
 			1:00	Hungary	CE%sT	1941 Apr  7 23:00
 			1:00	C-Eur	CE%sT	1945
 			1:00	Hungary	CE%sT	1984
 			1:00	EU	CE%sT
 
 # Italy
 # San Marino
 # Vatican City
 #
 # From Paul Eggert (2001-03-06):
 # Sicily and Sardinia each had their own time zones from 1866 to 1893,
 # called Palermo Time (+00:53:28) and Cagliari Time (+00:36:32).
 # During World War II, German-controlled Italy used German time.
 # But these events all occurred before the 1970 cutoff,
 # so record only the time in Rome.
 #
 # From Stephen Trainor (2019-05-06):
 # http://www.ac-ilsestante.it/MERIDIANE/ora_legale/ORA_LEGALE_ESTIVA_IN_ITALIA.htm
 # ... the [1866] law went into effect on 12 December 1866, rather than
 # the date of the decree (22 Sep 1866)
 # https://web.archive.org/web/20070824155341/http://www.iav.it/planetario/didastro/didastro/english.htm
 # ... "In Italy in 1866 there were 6 railway times (Torino, Verona, Firenze,
 # Roma, Napoli, Palermo). On that year it was decided to unify them, adopting
 # the average time of Rome (even if this city was not yet part of the
 # kingdom).  On the 12th December 1866, on the starting of the winter time
 # table, it took effect in the railways, the post office and the telegraph,
 # not only for the internal service but also for the public....  Milano set
 # the public watches on the Rome time on the same day (12th December 1866),
 # Torino and Bologna on the 1st January 1867, Venezia the 1st May 1880 and the
 # last city was Cagliari in 1886."
 #
 # From Luigi Rosa (2019-05-07):
 # this is the scan of the decree:
 # http://www.radiomarconi.com/marconi/filopanti/1866c.jpg
 #
 # From Michael Deckers (2016-10-24):
 # http://www.ac-ilsestante.it/MERIDIANE/ora_legale quotes a law of 1893-08-10
 # ... [translated as] "The preceding dispositions will enter into
 # force at the instant at which, according to the time specified in
 # the 1st article, the 1st of November 1893 will begin...."
 #
 # From Pierpaolo Bernardi (2016-10-20):
 # The authoritative source for time in Italy is the national metrological
 # institute, which has a summary page of historical DST data at
 # http://www.inrim.it/res/tf/ora_legale_i.shtml
 # [now at http://oldsite.inrim.it/res/tf/ora_legale_i.shtml as of 2017]
 # (2016-10-24):
 # http://www.renzobaldini.it/le-ore-legali-in-italia/
 # has still different data for 1944.  It divides Italy in two, as
 # there were effectively two governments at the time, north of Gothic
 # Line German controlled territory, official government RSI, and south
 # of the Gothic Line, controlled by allied armies.
 #
 # From Brian Inglis (2016-10-23):
 # Viceregal LEGISLATIVE DECREE. 14 September 1944, no. 219.
 # Restoration of Standard Time. (044U0219) (OJ 62 of 30.9.1944) ...
 # Given the R. law decreed on 1944-03-29, no. 92, by which standard time is
 # advanced to sixty minutes later starting at hour two on 1944-04-02; ...
 # Starting at hour three on the date 1944-09-17 standard time will be resumed.
 #
 # From Alois Treindl (2019-07-02):
 # I spent 6 Euros to buy two archive copies of Il Messaggero, a Roman paper,
 # for 1 and 2 April 1944.  The edition of 2 April has this note: "Tonight at 2
 # am, put forward the clock by one hour.  Remember that in the night between
 # today and Monday the 'ora legale' will come in force again."  That makes it
 # clear that in Rome the change was on Monday, 3 April 1944 at 2 am.
 #
 # From Paul Eggert (2021-10-05):
 # Go with INRiM for DST rules, except as corrected by Inglis for 1944
 # for the Kingdom of Italy.  This is consistent with Renzo Baldini.
 # Model Rome's occupation by using C-Eur rules from 1943-09-10
 # to 1944-06-04; although Rome was an open city during this period, it
 # was effectively controlled by Germany.  Using C-Eur is consistent
 # with Treindl's comment about Rome in April 1944, as the "Rule Italy"
 # lines during German occupation do not affect Europe/Rome
 # (though they do affect Europe/Malta).
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Italy	1916	only	-	Jun	 3	24:00	1:00	S
 Rule	Italy	1916	1917	-	Sep	30	24:00	0	-
 Rule	Italy	1917	only	-	Mar	31	24:00	1:00	S
 Rule	Italy	1918	only	-	Mar	 9	24:00	1:00	S
 Rule	Italy	1918	only	-	Oct	 6	24:00	0	-
 Rule	Italy	1919	only	-	Mar	 1	24:00	1:00	S
 Rule	Italy	1919	only	-	Oct	 4	24:00	0	-
 Rule	Italy	1920	only	-	Mar	20	24:00	1:00	S
 Rule	Italy	1920	only	-	Sep	18	24:00	0	-
 Rule	Italy	1940	only	-	Jun	14	24:00	1:00	S
 Rule	Italy	1942	only	-	Nov	 2	 2:00s	0	-
 Rule	Italy	1943	only	-	Mar	29	 2:00s	1:00	S
 Rule	Italy	1943	only	-	Oct	 4	 2:00s	0	-
 Rule	Italy	1944	only	-	Apr	 2	 2:00s	1:00	S
 Rule	Italy	1944	only	-	Sep	17	 2:00s	0	-
 Rule	Italy	1945	only	-	Apr	 2	 2:00	1:00	S
 Rule	Italy	1945	only	-	Sep	15	 1:00	0	-
 Rule	Italy	1946	only	-	Mar	17	 2:00s	1:00	S
 Rule	Italy	1946	only	-	Oct	 6	 2:00s	0	-
 Rule	Italy	1947	only	-	Mar	16	 0:00s	1:00	S
 Rule	Italy	1947	only	-	Oct	 5	 0:00s	0	-
 Rule	Italy	1948	only	-	Feb	29	 2:00s	1:00	S
 Rule	Italy	1948	only	-	Oct	 3	 2:00s	0	-
 Rule	Italy	1966	1968	-	May	Sun>=22	 0:00s	1:00	S
 Rule	Italy	1966	only	-	Sep	24	24:00	0	-
 Rule	Italy	1967	1969	-	Sep	Sun>=22	 0:00s	0	-
 Rule	Italy	1969	only	-	Jun	 1	 0:00s	1:00	S
 Rule	Italy	1970	only	-	May	31	 0:00s	1:00	S
 Rule	Italy	1970	only	-	Sep	lastSun	 0:00s	0	-
 Rule	Italy	1971	1972	-	May	Sun>=22	 0:00s	1:00	S
 Rule	Italy	1971	only	-	Sep	lastSun	 0:00s	0	-
 Rule	Italy	1972	only	-	Oct	 1	 0:00s	0	-
 Rule	Italy	1973	only	-	Jun	 3	 0:00s	1:00	S
 Rule	Italy	1973	1974	-	Sep	lastSun	 0:00s	0	-
 Rule	Italy	1974	only	-	May	26	 0:00s	1:00	S
 Rule	Italy	1975	only	-	Jun	 1	 0:00s	1:00	S
 Rule	Italy	1975	1977	-	Sep	lastSun	 0:00s	0	-
 Rule	Italy	1976	only	-	May	30	 0:00s	1:00	S
 Rule	Italy	1977	1979	-	May	Sun>=22	 0:00s	1:00	S
 Rule	Italy	1978	only	-	Oct	 1	 0:00s	0	-
 Rule	Italy	1979	only	-	Sep	30	 0:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Rome	0:49:56 -	LMT	1866 Dec 12
 			0:49:56	-	RMT	1893 Oct 31 23:00u # Rome Mean
 			1:00	Italy	CE%sT	1943 Sep 10
 			1:00	C-Eur	CE%sT	1944 Jun  4
 			1:00	Italy	CE%sT	1980
 			1:00	EU	CE%sT
 
 # Latvia
 
 # From Liene Kanepe (1998-09-17):
 
 # I asked about this matter Scientific Secretary of the Institute of Astronomy
 # of The University of Latvia Dr. paed Mr. Ilgonis Vilks. I also searched the
 # correct data in juridical acts and I found some juridical documents about
 # changes in the counting of time in Latvia from 1981....
 #
 # Act No. 35 of the Council of Ministers of Latvian SSR of 1981-01-22 ...
 # according to the Act No. 925 of the Council of Ministers of USSR of 1980-10-24
 # ...: all year round the time of 2nd time zone + 1 hour, in addition turning
 # the hands of the clock 1 hour forward on 1 April at 00:00 (GMT 31 March 21:00)
 # and 1 hour backward on the 1 October at 00:00 (GMT 30 September 20:00).
 #
 # Act No. 592 of the Council of Ministers of Latvian SSR of 1984-09-24 ...
 # according to the Act No. 967 of the Council of Ministers of USSR of 1984-09-13
 # ...: all year round the time of 2nd time zone + 1 hour, in addition turning
 # the hands of the clock 1 hour forward on the last Sunday of March at 02:00
 # (GMT 23:00 on the previous day) and 1 hour backward on the last Sunday of
 # September at 03:00 (GMT 23:00 on the previous day).
 #
 # Act No. 81 of the Council of Ministers of Latvian SSR of 1989-03-22 ...
 # according to the Act No. 227 of the Council of Ministers of USSR of 1989-03-14
 # ...: since the last Sunday of March 1989 in Lithuanian SSR, Latvian SSR,
 # Estonian SSR and Kaliningrad region of Russian Federation all year round the
 # time of 2nd time zone (Moscow time minus one hour). On the territory of Latvia
 # transition to summer time is performed on the last Sunday of March at 02:00
 # (GMT 00:00), turning the hands of the clock 1 hour forward.  The end of
 # daylight saving time is performed on the last Sunday of September at 03:00
 # (GMT 00:00), turning the hands of the clock 1 hour backward. Exception is
 # 1989-03-26, when we must not turn the hands of the clock....
 #
 # The Regulations of the Cabinet of Ministers of the Republic of Latvia of
 # 1997-01-21 on transition to Summer time ... established the same order of
 # daylight savings time settings as in the States of the European Union.
 
 # From Andrei Ivanov (2000-03-06):
 # This year Latvia will not switch to Daylight Savings Time (as specified in
 # The Regulations of the Cabinet of Ministers of the Rep. of Latvia of
 # 29-Feb-2000 (No. 79) ,
 # in Latvian for subscribers only).
 
 # From RFE/RL Newsline
 # http://www.rferl.org/newsline/2001/01/3-CEE/cee-030101.html
 # (2001-01-03), noted after a heads-up by Rives McDow:
 # The Latvian government on 2 January decided that the country will
 # institute daylight-saving time this spring, LETA reported.
 # Last February the three Baltic states decided not to turn back their
 # clocks one hour in the spring....
 # Minister of Economy Aigars Kalvītis noted that Latvia had too few
 # daylight hours and thus decided to comply with a draft European
 # Commission directive that provides for instituting daylight-saving
 # time in EU countries between 2002 and 2006. The Latvian government
 # urged Lithuania and Estonia to adopt a similar time policy, but it
 # appears that they will not do so....
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Latvia	1989	1996	-	Mar	lastSun	 2:00s	1:00	S
 Rule	Latvia	1989	1996	-	Sep	lastSun	 2:00s	0	-
 
 # Milne 1899 says Riga was 1:36:28 (Polytechnique House time).
 # Byalokoz 1919 says Latvia was 1:36:34.
 # Go with Byalokoz.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Riga	1:36:34	-	LMT	1880
 			1:36:34	-	RMT	1918 Apr 15  2:00 # Riga MT
 			1:36:34	1:00	LST	1918 Sep 16  3:00 # Latvian ST
 			1:36:34	-	RMT	1919 Apr  1  2:00
 			1:36:34	1:00	LST	1919 May 22  3:00
 			1:36:34	-	RMT	1926 May 11
 			2:00	-	EET	1940 Aug  5
 			3:00	-	MSK	1941 Jul
 			1:00	C-Eur	CE%sT	1944 Oct 13
 			3:00	Russia	MSK/MSD	1989 Mar lastSun  2:00s
 			2:00	1:00	EEST	1989 Sep lastSun  2:00s
 			2:00	Latvia	EE%sT	1997 Jan 21
 			2:00	EU	EE%sT	2000 Feb 29
 			2:00	-	EET	2001 Jan  2
 			2:00	EU	EE%sT
 
 # Lithuania
 
 # From Paul Eggert (2016-03-18):
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
 # From Paul Eggert (1996-11-22):
 # IATA SSIM (1992/1996) says Lithuania uses W-Eur rules, but since it is
 # known to be wrong about Estonia and Latvia, assume it's wrong here too.
 
 # From Marius Gedminas (1998-08-07):
 # I would like to inform that in this year Lithuanian time zone
 # (Europe/Vilnius) was changed.
 
 # From ELTA No. 972 (2582) (1999-09-29) ,
 # via Steffen Thorsen:
 # Lithuania has shifted back to the second time zone (GMT plus two hours)
 # to be valid here starting from October 31,
 # as decided by the national government on Wednesday....
 # The Lithuanian government also announced plans to consider a
 # motion to give up shifting to summer time in spring, as it was
 # already done by Estonia.
 
 # From the Fact File, Lithuanian State Department of Tourism
 #  (2000-03-27):
 # Local time is GMT+2 hours ..., no daylight saving.
 
 # From a user via Klaus Marten (2003-02-07):
 # As a candidate for membership of the European Union, Lithuania will
 # observe Summer Time in 2003, changing its clocks at the times laid
 # down in EU Directive 2000/84 of 19.I.01 (i.e. at the same times as its
 # neighbour Latvia). The text of the Lithuanian government Order of
 # 7.XI.02 to this effect can be found at
 # http://www.lrvk.lt/nut/11/n1749.htm
 
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Vilnius	1:41:16	-	LMT	1880
 			1:24:00	-	WMT	1917        # Warsaw Mean Time
 			1:35:36	-	KMT	1919 Oct 10 # Kaunas Mean Time
 			1:00	-	CET	1920 Jul 12
 			2:00	-	EET	1920 Oct  9
 			1:00	-	CET	1940 Aug  3
 			3:00	-	MSK	1941 Jun 24
 			1:00	C-Eur	CE%sT	1944 Aug
 			3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
 			2:00	Russia	EE%sT	1991 Sep 29  2:00s
 			2:00	C-Eur	EE%sT	1998
 			2:00	-	EET	1998 Mar 29  1:00u
 			1:00	EU	CE%sT	1999 Oct 31  1:00u
 			2:00	-	EET	2003 Jan  1
 			2:00	EU	EE%sT
 
 # Malta
 #
 # From Paul Eggert (2016-10-21):
 # Assume 1900-1972 was like Rome, overriding Shanks.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Malta	1973	only	-	Mar	31	0:00s	1:00	S
 Rule	Malta	1973	only	-	Sep	29	0:00s	0	-
 Rule	Malta	1974	only	-	Apr	21	0:00s	1:00	S
 Rule	Malta	1974	only	-	Sep	16	0:00s	0	-
 Rule	Malta	1975	1979	-	Apr	Sun>=15	2:00	1:00	S
 Rule	Malta	1975	1980	-	Sep	Sun>=15	2:00	0	-
 Rule	Malta	1980	only	-	Mar	31	2:00	1:00	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Malta	0:58:04 -	LMT	1893 Nov  2 # Valletta
 			1:00	Italy	CE%sT	1973 Mar 31
 			1:00	Malta	CE%sT	1981
 			1:00	EU	CE%sT
 
 # Moldova
 
 # From Stepan Golosunov (2016-03-07):
 # the act of the government of the Republic of Moldova Nr. 132 from 1990-05-04
 # http://lex.justice.md/viewdoc.php?action=view&view=doc&id=298782&lang=2
 # ... says that since 1990-05-06 on the territory of the Moldavian SSR
 # time would be calculated as the standard time of the second time belt
 # plus one hour of the "summer" time. To implement that clocks would be
 # adjusted one hour backwards at 1990-05-06 2:00. After that "summer"
 # time would be cancelled last Sunday of September at 3:00 and
 # reintroduced last Sunday of March at 2:00.
 
 # From Paul Eggert (2006-03-22):
 # A previous version of this database followed Shanks & Pottenger, who write
 # that Tiraspol switched to Moscow time on 1992-01-19 at 02:00.
 # However, this is most likely an error, as Moldova declared independence
 # on 1991-08-27 (the 1992-01-19 date is that of a Russian decree).
 # In early 1992 there was large-scale interethnic violence in the area
 # and it's possible that some Russophones continued to observe Moscow time.
 # But [two people] separately reported via
 # Jesper Nørgaard that as of 2001-01-24 Tiraspol was like Chisinau.
 # The Tiraspol entry has therefore been removed for now.
 #
 # From Alexander Krivenyshev (2011-10-17):
 # Pridnestrovian Moldavian Republic (PMR, also known as
 # "Pridnestrovie") has abolished seasonal clock change (no transition
 # to the Winter Time).
 #
 # News (in Russian):
 # http://www.kyivpost.ua/russia/news/pridnestrove-otkazalos-ot-perehoda-na-zimnee-vremya-30954.html
 # http://www.allmoldova.com/moldova-news/1249064116.html
 #
 # The substance of this change (reinstatement of the Tiraspol entry)
 # is from a patch from Petr Machata (2011-10-17)
 #
 # From Tim Parenti (2011-10-19)
 # In addition, being situated at +4651+2938 would give Tiraspol
 # a pre-1880 LMT offset of 1:58:32.
 #
 # (which agrees with the earlier entry that had been removed)
 #
 # From Alexander Krivenyshev (2011-10-26)
 # NO need to divide Moldova into two timezones at this point.
 # As of today, Transnistria (Pridnestrovie)- Tiraspol reversed its own
 # decision to abolish DST this winter.
 # Following Moldova and neighboring Ukraine- Transnistria (Pridnestrovie)-
 # Tiraspol will go back to winter time on October 30, 2011.
 # News from Moldova (in russian):
 # https://ru.publika.md/link_317061.html
 
 # From Roman Tudos (2015-07-02):
 # http://lex.justice.md/index.php?action=view&view=doc&lang=1&id=355077
 # From Paul Eggert (2015-07-01):
 # The abovementioned official link to IGO1445-868/2014 states that
 # 2014-10-26's fallback transition occurred at 03:00 local time.  Also,
 # https://www.trm.md/en/social/la-30-martie-vom-trece-la-ora-de-vara
 # says the 2014-03-30 spring-forward transition was at 02:00 local time.
 # Guess that since 1997 Moldova has switched one hour before the EU.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Moldova	1997	max	-	Mar	lastSun	 2:00	1:00	S
 Rule	Moldova	1997	max	-	Oct	lastSun	 3:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Chisinau	1:55:20 -	LMT	1880
 			1:55	-	CMT	1918 Feb 15 # Chisinau MT
 			1:44:24	-	BMT	1931 Jul 24 # Bucharest MT
 			2:00	Romania	EE%sT	1940 Aug 15
 			2:00	1:00	EEST	1941 Jul 17
 			1:00	C-Eur	CE%sT	1944 Aug 24
 			3:00	Russia	MSK/MSD	1990 May  6  2:00
 			2:00	Russia	EE%sT	1992
 			2:00	E-Eur	EE%sT	1997
 # See Romania commentary for the guessed 1997 transition to EU rules.
 			2:00	Moldova	EE%sT
 
 # Poland
 
 # The 1919 dates and times can be found in Tygodnik Urzędowy nr 1 (1919-03-20),
 #  pp 1-2.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Poland	1918	1919	-	Sep	16	2:00s	0	-
 Rule	Poland	1919	only	-	Apr	15	2:00s	1:00	S
 Rule	Poland	1944	only	-	Apr	 3	2:00s	1:00	S
 # Whitman gives 1944 Nov 30; go with Shanks & Pottenger.
 Rule	Poland	1944	only	-	Oct	 4	2:00	0	-
 # For 1944-1948 Whitman gives the previous day; go with Shanks & Pottenger.
 Rule	Poland	1945	only	-	Apr	29	0:00	1:00	S
 Rule	Poland	1945	only	-	Nov	 1	0:00	0	-
 # For 1946 on the source is Kazimierz Borkowski,
 # Toruń Center for Astronomy, Dept. of Radio Astronomy, Nicolaus Copernicus U.,
 # https://www.astro.uni.torun.pl/~kb/Artykuly/U-PA/Czas2.htm#tth_tAb1
 # Thanks to Przemysław Augustyniak (2005-05-28) for this reference.
 # He also gives these further references:
 # Mon Pol nr 13, poz 162 (1995) 
 # Druk nr 2180 (2003) 
 Rule	Poland	1946	only	-	Apr	14	0:00s	1:00	S
 Rule	Poland	1946	only	-	Oct	 7	2:00s	0	-
 Rule	Poland	1947	only	-	May	 4	2:00s	1:00	S
 Rule	Poland	1947	1949	-	Oct	Sun>=1	2:00s	0	-
 Rule	Poland	1948	only	-	Apr	18	2:00s	1:00	S
 Rule	Poland	1949	only	-	Apr	10	2:00s	1:00	S
 Rule	Poland	1957	only	-	Jun	 2	1:00s	1:00	S
 Rule	Poland	1957	1958	-	Sep	lastSun	1:00s	0	-
 Rule	Poland	1958	only	-	Mar	30	1:00s	1:00	S
 Rule	Poland	1959	only	-	May	31	1:00s	1:00	S
 Rule	Poland	1959	1961	-	Oct	Sun>=1	1:00s	0	-
 Rule	Poland	1960	only	-	Apr	 3	1:00s	1:00	S
 Rule	Poland	1961	1964	-	May	lastSun	1:00s	1:00	S
 Rule	Poland	1962	1964	-	Sep	lastSun	1:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Warsaw	1:24:00 -	LMT	1880
 			1:24:00	-	WMT	1915 Aug  5 # Warsaw Mean Time
 			1:00	C-Eur	CE%sT	1918 Sep 16  3:00
 			2:00	Poland	EE%sT	1922 Jun
 			1:00	Poland	CE%sT	1940 Jun 23  2:00
 			1:00	C-Eur	CE%sT	1944 Oct
 			1:00	Poland	CE%sT	1977
 			1:00	W-Eur	CE%sT	1988
 			1:00	EU	CE%sT
 
 # Portugal
 
 # From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne:
 # According to a Portuguese decree (1911-05-26)
 # https://dre.pt/application/dir/pdf1sdip/1911/05/12500/23132313.pdf
 # Lisbon was at -0:36:44.68, but switched to GMT on 1912-01-01 at 00:00.
 #
 # From Michael Deckers (2018-02-15):
 # article 5 [of the 1911 decree; Deckers's translation] ...:
 # These dispositions shall enter into force at the instant at which,
 # according to the 2nd article, the civil day January 1, 1912 begins,
 # all clocks therefore having to be advanced or set back correspondingly ...
 
 # From Rui Pedro Salgueiro (1992-11-12):
 # Portugal has recently (September, 27) changed timezone
 # (from WET to MET or CET) to harmonize with EEC.
 #
 # Martin Bruckmann (1996-02-29) reports via Peter Ilieve
 # that Portugal is reverting to 0:00 by not moving its clocks this spring.
 # The new Prime Minister was fed up with getting up in the dark in the winter.
 #
 # From Paul Eggert (1996-11-12):
 # IATA SSIM (1991-09) reports several 1991-09 and 1992-09 transitions
 # at 02:00u, not 01:00u.  Assume that these are typos.
 # IATA SSIM (1991/1992) reports that the Azores were at -1:00.
 # IATA SSIM (1993-02) says +0:00; later issues (through 1996-09) say -1:00.
 # Guess that the Azores changed to EU rules in 1992 (since that's when Portugal
 # harmonized with EU rules), and that they stayed +0:00 that winter.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # DSH writes that despite Decree 1,469 (1915), the change to the clocks was not
 # done every year, depending on what Spain did, because of railroad schedules.
 # Go with Shanks & Pottenger.
 Rule	Port	1916	only	-	Jun	17	23:00	1:00	S
 # Whitman gives 1916 Oct 31; go with Shanks & Pottenger.
 Rule	Port	1916	only	-	Nov	 1	 1:00	0	-
 Rule	Port	1917	only	-	Feb	28	23:00s	1:00	S
 Rule	Port	1917	1921	-	Oct	14	23:00s	0	-
 Rule	Port	1918	only	-	Mar	 1	23:00s	1:00	S
 Rule	Port	1919	only	-	Feb	28	23:00s	1:00	S
 Rule	Port	1920	only	-	Feb	29	23:00s	1:00	S
 Rule	Port	1921	only	-	Feb	28	23:00s	1:00	S
 Rule	Port	1924	only	-	Apr	16	23:00s	1:00	S
 Rule	Port	1924	only	-	Oct	14	23:00s	0	-
 Rule	Port	1926	only	-	Apr	17	23:00s	1:00	S
 Rule	Port	1926	1929	-	Oct	Sat>=1	23:00s	0	-
 Rule	Port	1927	only	-	Apr	 9	23:00s	1:00	S
 Rule	Port	1928	only	-	Apr	14	23:00s	1:00	S
 Rule	Port	1929	only	-	Apr	20	23:00s	1:00	S
 Rule	Port	1931	only	-	Apr	18	23:00s	1:00	S
 # Whitman gives 1931 Oct 8; go with Shanks & Pottenger.
 Rule	Port	1931	1932	-	Oct	Sat>=1	23:00s	0	-
 Rule	Port	1932	only	-	Apr	 2	23:00s	1:00	S
 Rule	Port	1934	only	-	Apr	 7	23:00s	1:00	S
 # Whitman gives 1934 Oct 5; go with Shanks & Pottenger.
 Rule	Port	1934	1938	-	Oct	Sat>=1	23:00s	0	-
 # Shanks & Pottenger give 1935 Apr 30; go with Whitman.
 Rule	Port	1935	only	-	Mar	30	23:00s	1:00	S
 Rule	Port	1936	only	-	Apr	18	23:00s	1:00	S
 # Whitman gives 1937 Apr 2; go with Shanks & Pottenger.
 Rule	Port	1937	only	-	Apr	 3	23:00s	1:00	S
 Rule	Port	1938	only	-	Mar	26	23:00s	1:00	S
 Rule	Port	1939	only	-	Apr	15	23:00s	1:00	S
 # Whitman gives 1939 Oct 7; go with Shanks & Pottenger.
 Rule	Port	1939	only	-	Nov	18	23:00s	0	-
 Rule	Port	1940	only	-	Feb	24	23:00s	1:00	S
 # Shanks & Pottenger give 1940 Oct 7; go with Whitman.
 Rule	Port	1940	1941	-	Oct	 5	23:00s	0	-
 Rule	Port	1941	only	-	Apr	 5	23:00s	1:00	S
 Rule	Port	1942	1945	-	Mar	Sat>=8	23:00s	1:00	S
 Rule	Port	1942	only	-	Apr	25	22:00s	2:00	M # Midsummer
 Rule	Port	1942	only	-	Aug	15	22:00s	1:00	S
 Rule	Port	1942	1945	-	Oct	Sat>=24	23:00s	0	-
 Rule	Port	1943	only	-	Apr	17	22:00s	2:00	M
 Rule	Port	1943	1945	-	Aug	Sat>=25	22:00s	1:00	S
 Rule	Port	1944	1945	-	Apr	Sat>=21	22:00s	2:00	M
 Rule	Port	1946	only	-	Apr	Sat>=1	23:00s	1:00	S
 Rule	Port	1946	only	-	Oct	Sat>=1	23:00s	0	-
 # Whitman says DST was not observed in 1950; go with Shanks & Pottenger.
 # Whitman gives Oct lastSun for 1952 on; go with Shanks & Pottenger.
 Rule	Port	1947	1965	-	Apr	Sun>=1	 2:00s	1:00	S
 Rule	Port	1947	1965	-	Oct	Sun>=1	 2:00s	0	-
 Rule	Port	1977	only	-	Mar	27	 0:00s	1:00	S
 Rule	Port	1977	only	-	Sep	25	 0:00s	0	-
 Rule	Port	1978	1979	-	Apr	Sun>=1	 0:00s	1:00	S
 Rule	Port	1978	only	-	Oct	 1	 0:00s	0	-
 Rule	Port	1979	1982	-	Sep	lastSun	 1:00s	0	-
 Rule	Port	1980	only	-	Mar	lastSun	 0:00s	1:00	S
 Rule	Port	1981	1982	-	Mar	lastSun	 1:00s	1:00	S
 Rule	Port	1983	only	-	Mar	lastSun	 2:00s	1:00	S
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-0:36:44.68
 Zone	Europe/Lisbon	-0:36:45 -	LMT	1884
 			-0:36:45 -	LMT	1912 Jan  1  0:00u # Lisbon MT
 			 0:00	Port	WE%sT	1966 Apr  3  2:00
 			 1:00	-	CET	1976 Sep 26  1:00
 			 0:00	Port	WE%sT	1983 Sep 25  1:00s
 			 0:00	W-Eur	WE%sT	1992 Sep 27  1:00s
 			 1:00	EU	CE%sT	1996 Mar 31  1:00u
 			 0:00	EU	WE%sT
 Zone Atlantic/Azores	-1:42:40 -	LMT	1884        # Ponta Delgada
 			-1:54:32 -	HMT	1912 Jan  1  2:00u # Horta MT
 # Vanguard section, for zic and other parsers that support %z.
 #			-2:00	Port	%z	1966 Apr  3  2:00
 #			-1:00	Port	%z	1983 Sep 25  1:00s
 #			-1:00	W-Eur	%z	1992 Sep 27  1:00s
 # Rearguard section, for parsers lacking %z; see ziguard.awk.
 			-2:00	Port	-02/-01	1942 Apr 25 22:00s
 			-2:00	Port	+00	1942 Aug 15 22:00s
 			-2:00	Port	-02/-01	1943 Apr 17 22:00s
 			-2:00	Port	+00	1943 Aug 28 22:00s
 			-2:00	Port	-02/-01	1944 Apr 22 22:00s
 			-2:00	Port	+00	1944 Aug 26 22:00s
 			-2:00	Port	-02/-01	1945 Apr 21 22:00s
 			-2:00	Port	+00	1945 Aug 25 22:00s
 			-2:00	Port	-02/-01	1966 Apr  3  2:00
 			-1:00	Port	-01/+00	1983 Sep 25  1:00s
 			-1:00	W-Eur	-01/+00	1992 Sep 27  1:00s
 # End of rearguard section.
 			 0:00	EU	WE%sT	1993 Mar 28  1:00u
 			-1:00	EU	-01/+00
 Zone Atlantic/Madeira	-1:07:36 -	LMT	1884        # Funchal
 			-1:07:36 -	FMT	1912 Jan  1  1:00u # Funchal MT
 # Vanguard section, for zic and other parsers that support %z.
 #			-1:00	Port	%z	1966 Apr  3  2:00
 # Rearguard section, for parsers lacking %z; see ziguard.awk.
 			-1:00	Port	-01/+00	1942 Apr 25 22:00s
 			-1:00	Port	+01	1942 Aug 15 22:00s
 			-1:00	Port	-01/+00	1943 Apr 17 22:00s
 			-1:00	Port	+01	1943 Aug 28 22:00s
 			-1:00	Port	-01/+00	1944 Apr 22 22:00s
 			-1:00	Port	+01	1944 Aug 26 22:00s
 			-1:00	Port	-01/+00	1945 Apr 21 22:00s
 			-1:00	Port	+01	1945 Aug 25 22:00s
 			-1:00	Port	-01/+00	1966 Apr  3  2:00
 # End of rearguard section.
 			 0:00	Port	WE%sT	1983 Sep 25  1:00s
 			 0:00	EU	WE%sT
 
 # Romania
 #
 # From Paul Eggert (1999-10-07):
 # Nine O'clock 
 # (1998-10-23) reports that the switch occurred at
 # 04:00 local time in fall 1998.  For lack of better info,
 # assume that Romania and Moldova switched to EU rules in 1997,
 # the same year as Bulgaria.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Romania	1932	only	-	May	21	 0:00s	1:00	S
 Rule	Romania	1932	1939	-	Oct	Sun>=1	 0:00s	0	-
 Rule	Romania	1933	1939	-	Apr	Sun>=2	 0:00s	1:00	S
 Rule	Romania	1979	only	-	May	27	 0:00	1:00	S
 Rule	Romania	1979	only	-	Sep	lastSun	 0:00	0	-
 Rule	Romania	1980	only	-	Apr	 5	23:00	1:00	S
 Rule	Romania	1980	only	-	Sep	lastSun	 1:00	0	-
 Rule	Romania	1991	1993	-	Mar	lastSun	 0:00s	1:00	S
 Rule	Romania	1991	1993	-	Sep	lastSun	 0:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Bucharest	1:44:24 -	LMT	1891 Oct
 			1:44:24	-	BMT	1931 Jul 24 # Bucharest MT
 			2:00	Romania	EE%sT	1981 Mar 29  2:00s
 			2:00	C-Eur	EE%sT	1991
 			2:00	Romania	EE%sT	1994
 			2:00	E-Eur	EE%sT	1997
 			2:00	EU	EE%sT
 
 
 # Russia
 
 # From Alexander Krivenyshev (2011-09-15):
 # Based on last Russian Government Decree No. 725 on August 31, 2011
 # (Government document
 # http://www.government.ru/gov/results/16355/print/
 # in Russian)
 # there are few corrections have to be made for some Russian time zones...
 # All updated Russian Time Zones were placed in table and translated to English
 # by WorldTimeZone.com at the link below:
 # http://www.worldtimezone.com/dst_news/dst_news_russia36.htm
 
 # From Sanjeev Gupta (2011-09-27):
 # Scans of [Decree No. 23 of January 8, 1992] are available at:
 # http://government.consultant.ru/page.aspx?1223966
 # They are in Cyrillic letters (presumably Russian).
 
 # From Arthur David Olson (2012-05-09):
 # Regarding the instant when clocks in time-zone-shifting parts of Russia
 # changed in September 2011:
 #
 # One source is
 # http://government.ru/gov/results/16355/
 # which, according to translate.google.com, begins "Decree of August 31,
 # 2011 No. 725" and contains no other dates or "effective date" information.
 #
 # Another source is
 # https://rg.ru/2011/09/06/chas-zona-dok.html
 # which, according to translate.google.com, begins "Resolution of the
 # Government of the Russian Federation on August 31, 2011 N 725" and also
 # contains "Date first official publication: September 6, 2011 Posted on:
 # in the 'RG' - Federal Issue No. 5573 September 6, 2011" but which
 # does not contain any "effective date" information.
 #
 # Another source is
 # https://en.wikipedia.org/wiki/Oymyakonsky_District#cite_note-RuTime-7
 # which, in note 8, contains "Resolution No. 725 of August 31, 2011...
 # Effective as of after 7 days following the day of the official publication"
 # but which does not contain any reference to September 6, 2011.
 #
 # The Wikipedia article refers to
 # http://base.consultant.ru/cons/cgi/online.cgi?req=doc;base=LAW;n=118896
 # which seems to copy the text of the government.ru page.
 #
 # Tobias Conradi combines Wikipedia's
 # "as of after 7 days following the day of the official publication"
 # with www.rg.ru's "Date of first official publication: September 6, 2011" to
 # get September 13, 2011 as the cutover date (unusually, a Tuesday, as Tobias
 # Conradi notes).
 #
 # None of the sources indicates a time of day for changing clocks.
 #
 # Go with 2011-09-13 0:00s.
 
 # From Alexander Krivenyshev (2014-07-01):
 # According to the Russian news (ITAR-TASS News Agency)
 # http://en.itar-tass.com/russia/738562
 # the State Duma has approved ... the draft bill on returning to
 # winter time standard and return Russia 11 time zones.  The new
 # regulations will come into effect on October 26, 2014 at 02:00 ...
 # http://asozd2.duma.gov.ru/main.nsf/%28Spravka%29?OpenAgent&RN=431985-6&02
 # Here is a link where we put together table (based on approved Bill N
 # 431985-6) with proposed 11 Russian time zones and corresponding
 # areas/cities/administrative centers in the Russian Federation (in English):
 # http://www.worldtimezone.com/dst_news/dst_news_russia65.html
 #
 # From Alexander Krivenyshev (2014-07-22):
 # Putin signed the Federal Law 431985-6 ... (in Russian)
 # http://itar-tass.com/obschestvo/1333711
 # http://www.pravo.gov.ru:8080/page.aspx?111660
 # http://www.kremlin.ru/acts/46279
 # From October 26, 2014 the new Russian time zone map will look like this:
 # http://www.worldtimezone.com/dst_news/dst_news_russia-map-2014-07.html
 
 # From Paul Eggert (2006-03-22):
 # Moscow time zone abbreviations after 1919-07-01, and Moscow rules after 1991,
 # are from Andrey A. Chernov.  The rest is from Shanks & Pottenger,
 # except we follow Chernov's report that 1992 DST transitions were Sat
 # 23:00, not Sun 02:00s.
 #
 # From Stanislaw A. Kuzikowski (1994-06-29):
 # But now it is some months since Novosibirsk is 3 hours ahead of Moscow!
 # I do not know why they have decided to make this change;
 # as far as I remember it was done exactly during winter->summer switching
 # so we (Novosibirsk) simply did not switch.
 #
 # From Andrey A. Chernov (1996-10-04):
 # 'MSK' and 'MSD' were born and used initially on Moscow computers with
 # UNIX-like OSes by several developer groups (e.g. Demos group, Kiae group)....
 # The next step was the UUCP network, the Relcom predecessor
 # (used mainly for mail), and MSK/MSD was actively used there.
 #
 # From Chris Carrier (1996-10-30):
 # According to a friend of mine who rode the Trans-Siberian Railroad from
 # Moscow to Irkutsk in 1995, public air and rail transport in Russia ...
 # still follows Moscow time, no matter where in Russia it is located.
 #
 # For Grozny, Chechnya, we have the following story from
 # John Daniszewski, "Scavengers in the Rubble", Los Angeles Times (2001-02-07):
 # News - often false - is spread by word of mouth.  A rumor that it was
 # time to move the clocks back put this whole city out of sync with
 # the rest of Russia for two weeks - even soldiers stationed here began
 # enforcing curfew at the wrong time.
 #
 # From Gwillim Law (2001-06-05):
 # There's considerable evidence that Sakhalin Island used to be in
 # UTC+11, and has changed to UTC+10, in this decade.  I start with the
 # SSIM, which listed Yuzhno-Sakhalinsk in zone RU10 along with Magadan
 # until February 1997, and then in RU9 with Khabarovsk and Vladivostok
 # since September 1997....  Although the Kuril Islands are
 # administratively part of Sakhalin oblast', they appear to have
 # remained on UTC+11 along with Magadan.
 
 # From Marat Nigametzianov (2018-07-16):
 # this is link to order from 1956 about timezone in USSR
 # http://astro.uni-altai.ru/~orion/blog/2011/11/novyie-granitsyi-chasovyih-poyasov-v-sssr/
 #
 # From Paul Eggert (2018-07-16):
 # Perhaps someone could translate the above-mentioned link and use it
 # to correct our data for the ex-Soviet Union.  It cites the following:
 # «Поясное время и новые границы часовых поясов» / сост. П.Н. Долгов,
 # отв. ред. Г.Д. Бурдун - М: Комитет стандартов, мер и измерительных
 # приборов при Совете Министров СССР, Междуведомственная комиссия
 # единой службы времени, 1956 г.
 # This book looks like it would be a helpful resource for the Soviet
 # Union through 1956.  Although a copy was in the Scientific Library
 # of Tomsk State University, I have not been able to track down a copy nearby.
 #
 # From Stepan Golosunov (2018-07-21):
 # http://astro.uni-altai.ru/~orion/blog/2015/05/center-reforma-ischisleniya-vremeni-br-na-territorii-sssr-v-1957-godu-center/
 # says that the 1956 decision to change time belts' borders was not
 # implemented as planned in 1956 and the change happened in 1957.
 # There is also the problem that actual time zones were different from
 # the official time belts (and from many time belts' maps) as there were
 # numerous exceptions to application of time belt rules.  For example,
 # https://ru.wikipedia.org/wiki/Московское_время#Перемещение_границы_применения_московского_времени_на_восток
 # says that by 1962 there were many regions in the 3rd time belt that
 # were on Moscow time, referring to a 1962 map.  By 1989 number of such
 # exceptions grew considerably.
 
 # From Tim Parenti (2014-07-06):
 # The comments detailing the coverage of each Russian zone are meant to assist
 # with maintenance only and represent our best guesses as to which regions
 # are covered by each zone.  They are not meant to be taken as an authoritative
 # listing.  The region codes listed come from
 # https://en.wikipedia.org/w/?title=Federal_subjects_of_Russia&oldid=611810498
 # and are used for convenience only; no guarantees are made regarding their
 # future stability.  ISO 3166-2:RU codes are also listed for first-level
 # divisions where available.
 
 # From Tim Parenti (2014-07-03):
 # Europe/Kaliningrad covers...
 # 39	RU-KGD	Kaliningrad Oblast
 
 # From Paul Eggert (2019-07-25):
 # Although Shanks lists 1945-01-01 as the date for transition from
 # +01/+02 to +02/+03, more likely this is a placeholder.  Guess that
 # the transition occurred at 1945-04-10 00:00, which is about when
 # Königsberg surrendered to Soviet troops.  (Thanks to Alois Treindl.)
 
 # From Paul Eggert (2016-03-18):
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
 # From Stepan Golosunov (2016-03-07):
 # http://www.rgo.ru/ru/kaliningradskoe-oblastnoe-otdelenie/ob-otdelenii/publikacii/kak-nam-zhilos-bez-letnego-vremeni
 # confirms that the 1989 change to Moscow-1 was implemented.
 # (The article, though, is misattributed to 1990 while saying that
 # summer->winter transition would be done on the 24 of September. But
 # 1990-09-24 was Monday, while 1989-09-24 was Sunday as expected.)
 # ...
 # http://www.kaliningradka.ru/site_pc/cherez/index.php?ELEMENT_ID=40091
 # says that Kaliningrad switched to Moscow-1 on 1989-03-26, avoided
 # at the last moment switch to Moscow-1 on 1991-03-31, switched to
 # Moscow on 1991-11-03, switched to Moscow-1 on 1992-01-19.
 
 Zone Europe/Kaliningrad	 1:22:00 -	LMT	1893 Apr
 			 1:00	C-Eur	CE%sT	1945 Apr 10
 			 2:00	Poland	EE%sT	1946 Apr  7
 			 3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
 			 2:00	Russia	EE%sT	2011 Mar 27  2:00s
 			 3:00	-	+03	2014 Oct 26  2:00s
 			 2:00	-	EET
 
 
 # From Paul Eggert (2016-02-21), per Tim Parenti (2014-07-03) and
 # Oscar van Vlijmen (2001-08-25):
 # Europe/Moscow covers...
 # 01	RU-AD	Adygea, Republic of
 # 05	RU-DA	Dagestan, Republic of
 # 06	RU-IN	Ingushetia, Republic of
 # 07	RU-KB	Kabardino-Balkar Republic
 # 08	RU-KL	Kalmykia, Republic of
 # 09	RU-KC	Karachay-Cherkess Republic
 # 10	RU-KR	Karelia, Republic of
 # 11	RU-KO	Komi Republic
 # 12	RU-ME	Mari El Republic
 # 13	RU-MO	Mordovia, Republic of
 # 15	RU-SE	North Ossetia-Alania, Republic of
 # 16	RU-TA	Tatarstan, Republic of
 # 20	RU-CE	Chechen Republic
 # 21	RU-CU	Chuvash Republic
 # 23	RU-KDA	Krasnodar Krai
 # 26	RU-STA	Stavropol Krai
 # 29	RU-ARK	Arkhangelsk Oblast
 # 31	RU-BEL	Belgorod Oblast
 # 32	RU-BRY	Bryansk Oblast
 # 33	RU-VLA	Vladimir Oblast
 # 35	RU-VLG	Vologda Oblast
 # 36	RU-VOR	Voronezh Oblast
 # 37	RU-IVA	Ivanovo Oblast
 # 40	RU-KLU	Kaluga Oblast
 # 44	RU-KOS	Kostroma Oblast
 # 46	RU-KRS	Kursk Oblast
 # 47	RU-LEN	Leningrad Oblast
 # 48	RU-LIP	Lipetsk Oblast
 # 50	RU-MOS	Moscow Oblast
 # 51	RU-MUR	Murmansk Oblast
 # 52	RU-NIZ	Nizhny Novgorod Oblast
 # 53	RU-NGR	Novgorod Oblast
 # 57	RU-ORL	Oryol Oblast
 # 58	RU-PNZ	Penza Oblast
 # 60	RU-PSK	Pskov Oblast
 # 61	RU-ROS	Rostov Oblast
 # 62	RU-RYA	Ryazan Oblast
 # 67	RU-SMO	Smolensk Oblast
 # 68	RU-TAM	Tambov Oblast
 # 69	RU-TVE	Tver Oblast
 # 71	RU-TUL	Tula Oblast
 # 76	RU-YAR	Yaroslavl Oblast
 # 77	RU-MOW	Moscow
 # 78	RU-SPE	Saint Petersburg
 # 83	RU-NEN	Nenets Autonomous Okrug
 
 # From Paul Eggert (2016-08-23):
 # The Soviets switched to UT-based time in 1919.  Decree No. 59
 # (1919-02-08) http://istmat.info/node/35567 established UT-based time
 # zones, and Decree No. 147 (1919-03-29) http://istmat.info/node/35854
 # specified a transition date of 1919-07-01, apparently at 00:00 UT.
 # No doubt only the Soviet-controlled regions switched on that date;
 # later transitions to UT-based time in other parts of Russia are
 # taken from what appear to be guesses by Shanks.
 # (Thanks to Alexander Belopolsky for pointers to the decrees.)
 
 # From Stepan Golosunov (2016-03-07):
 # 11. Regions-violators, 1981-1982.
 # Wikipedia refers to
 # http://maps.monetonos.ru/maps/raznoe/Old_Maps/Old_Maps/Articles/022/3_1981.html
 # http://besp.narod.ru/nauka_1981_3.htm
 #
 # The second link provides two articles scanned from the Nauka i Zhizn
 # magazine No. 3, 1981 and a scan of the short article attributed to
 # the Trud newspaper from February 1982.  The first link provides the
 # same Nauka i Zhizn articles converted to the text form (but misses
 # time belt changes map).
 #
 # The second Nauka i Zhizn article says that in addition to
 # introduction of summer time on 1981-04-01 there are some time belt
 # border changes on 1981-10-01, mostly affecting Nenets Autonomous
 # Okrug, Krasnoyarsk Krai, Yakutia, Magadan Oblast and Chukotka
 # according to the provided map (colored one).  In addition to that
 # "time violators" (regions which were not using rules of the time
 # belts in which they were located) would not be moving off the DST on
 # 1981-10-01 to restore the decree time usage.  (Komi ASSR was
 # supposed to repeat that move in October 1982 to account for the 2
 # hour difference.)  Map depicting "time violators" before 1981-10-01
 # is also provided.
 #
 # The article from Trud says that 1981-10-01 changes caused problems
 # and some territories would be moved to pre-1981-10-01 time by not
 # moving to summer time on 1982-04-01.  Namely: Dagestan,
 # Kabardino-Balkar, Kalmyk, Komi, Mari, Mordovian, North Ossetian,
 # Tatar, Chechen-Ingush and Chuvash ASSR, Krasnodar and Stavropol
 # krais, Arkhangelsk, Vladimir, Vologda, Voronezh, Gorky, Ivanovo,
 # Kostroma, Lipetsk, Penza, Rostov, Ryazan, Tambov, Tyumen and
 # Yaroslavl oblasts, Nenets and Evenk autonomous okrugs, Khatangsky
 # district of Taymyr Autonomous Okrug.  As a result Evenk Autonomous
 # Okrug and Khatangsky district of Taymyr Autonomous Okrug would end
 # up on Moscow+4, Tyumen Oblast on Moscow+2 and the rest on Moscow
 # time.
 #
 # http://astrozet.net/files/Zones/DOC/RU/1980-925.txt
 # attributes the 1982 changes to the Act of the Council of Ministers
 # of the USSR No. 126 from 18.02.1982.  1980-925.txt also adds
 # Udmurtia to the list of affected territories and lists Khatangsky
 # district separately from Taymyr Autonomous Okrug.  Probably erroneously.
 #
 # The affected territories are currently listed under Europe/Moscow,
 # Asia/Yekaterinburg and Asia/Krasnoyarsk.
 #
 # 12. Udmurtia
 # The fact that Udmurtia is depicted as a violator in the Nauka i
 # Zhizn article hints at Izhevsk being on different time from
 # Kuybyshev before 1981-10-01. Udmurtia is not mentioned in the 1989 act.
 # http://astrozet.net/files/Zones/DOC/RU/1980-925.txt
 # implies Udmurtia was on Moscow time after 1982-04-01.
 # Wikipedia implies Udmurtia being on Moscow+1 until 1991.
 #
 # ...
 #
 # All Russian zones are supposed to have by default a -1 change at
 # 1991-03-31 2:00 (cancellation of the decree time in the USSR) and a +1
 # change at 1992-01-19 2:00 (restoration of the decree time in Russia).
 #
 # There were some exceptions, though.
 # Wikipedia says newspapers listed Astrakhan, Saratov, Kirov, Volgograd,
 # Izhevsk, Grozny, Kazan and Samara as such exceptions for the 1992
 # change. (Different newspapers providing different lists. And some
 # lists found in the internet are quite wild.)
 #
 # And apparently some exceptions were reverted in the last moment.
 # http://www.kaliningradka.ru/site_pc/cherez/index.php?ELEMENT_ID=40091
 # says that Kaliningrad decided not to be an exception 2 days before the
 # 1991-03-31 switch and one person at
 # https://izhevsk.ru/forum_light_message/50/682597-m8369040.html
 # says he remembers that Samara opted out of the 1992-01-19 exception
 # 2 days before the switch.
 #
 # From Alois Treindl (2022-02-15):
 # the Russian wikipedia page
 # https://ru.wikipedia.org/wiki/Московское_время#Перемещение_границы_применения_московского_времени_на_восток
 # contains the sentence (in Google translation) "In the autumn of
 # 1981, Arkhangelsk, Vologda, Yaroslavl, Ivanovo, Vladimir, Ryazan,
 # Lipetsk, Voronezh, Rostov-on-Don, Krasnodar and regions to the east
 # of those named (about 30 in total) parted ways with Moscow time.
 # However, the convenience of common time with Moscow turned out to be
 # decisive - in 1982, these regions again switched to Moscow time."
 # Shanks International atlas has similar information, and also the
 # Russian book Zaitsev A., Kutalev D. A new astrologer's reference
 # book. Coordinates of cities and time corrections, - The World of
 # Urania, 2012 (Russian: Зайцев А., Куталёв Д., Новый справочник
 # астролога. Координаты городов и временные поправки).
 # To me it seems that an extra zone is needed, which starts with LMT
 # util 1919, later follows Moscow since 1930, but deviates from it
 # between 1 October 1981 until 1 April 1982.
 #
 #
 # From Paul Eggert (2022-02-15):
 # Given the above, we appear to be missing some Zone entries for the
 # chaotic early 1980s in Russia.  It's not clear what these entries
 # should be.  For now, sweep this under the rug and just document the
 # time in Moscow.
 
 # From Vladimir Karpinsky (2014-07-08):
 # LMT in Moscow (before Jul 3, 1916) is 2:30:17, that was defined by Moscow
 # Observatory (coordinates: 55° 45' 29.70", 37° 34' 05.30")....
 # LMT in Moscow since Jul 3, 1916 is 2:31:01 as a result of new standard.
 # (The info is from the book by Byalokoz ... p. 18.)
 # The time in St. Petersburg as capital of Russia was defined by
 # Pulkov observatory, near St. Petersburg.  In 1916 LMT Moscow
 # was synchronized with LMT St. Petersburg (+30 minutes), (Pulkov observatory
 # coordinates: 59° 46' 18.70", 30° 19' 40.70") so 30° 19' 40.70" >
 # 2h01m18.7s = 2:01:19.  LMT Moscow = LMT St.Petersburg + 30m 2:01:19 + 0:30 =
 # 2:31:19 ...
 #
 # From Paul Eggert (2014-07-08):
 # Milne does not list Moscow, but suggests that its time might be listed in
 # Résumés mensuels et annuels des observations météorologiques (1895).
 # Presumably this is OCLC 85825704, a journal published with parallel text in
 # Russian and French.  This source has not been located; go with Karpinsky.
 
 Zone Europe/Moscow	 2:30:17 -	LMT	1880
 			 2:30:17 -	MMT	1916 Jul  3 # Moscow Mean Time
 			 2:31:19 Russia	%s	1919 Jul  1  0:00u
 			 3:00	Russia	%s	1921 Oct
 			 3:00	Russia	MSK/MSD	1922 Oct
 			 2:00	-	EET	1930 Jun 21
 			 3:00	Russia	MSK/MSD	1991 Mar 31  2:00s
 			 2:00	Russia	EE%sT	1992 Jan 19  2:00s
 			 3:00	Russia	MSK/MSD	2011 Mar 27  2:00s
 			 4:00	-	MSK	2014 Oct 26  2:00s
 			 3:00	-	MSK
 
 
 # From Paul Eggert (2016-12-06):
 # Europe/Simferopol covers Crimea.
 
 Zone Europe/Simferopol	 2:16:24 -	LMT	1880
 			 2:16	-	SMT	1924 May  2 # Simferopol Mean T
 			 2:00	-	EET	1930 Jun 21
 			 3:00	-	MSK	1941 Nov
 			 1:00	C-Eur	CE%sT	1944 Apr 13
 			 3:00	Russia	MSK/MSD	1990
 			 3:00	-	MSK	1990 Jul  1  2:00
 			 2:00	-	EET	1992 Mar 20
 # Central Crimea used Moscow time 1994/1997.
 #
 # From Paul Eggert (2022-07-21):
 # The _Economist_ (1994-05-28, p 45) reported that central Crimea switched
 # from Kyiv to Moscow time sometime after the January 1994 elections.
 # Shanks (1999) says "date of change uncertain", but implies that it happened
 # sometime between the 1994 DST switches.  Shanks & Pottenger simply say
 # 1994-09-25 03:00, but that can't be right.  For now, guess it
 # changed in May.  This change evidently didn't last long; see below.
 			 2:00	C-Eur	EE%sT	1994 May
 # From IATA SSIM (1994/1997), which also said that Kerch is still like Kyiv.
 			 3:00	C-Eur	MSK/MSD	1996 Mar 31  0:00s
 			 3:00	1:00	MSD	1996 Oct 27  3:00s
 # IATA SSIM (1997-09) said Crimea switched to EET/EEST.
 # Assume it happened in March by not changing the clocks.
 			 3:00	-	MSK	1997 Mar lastSun  1:00u
 # From Alexander Krivenyshev (2014-03-17):
 # time change at 2:00 (2am) on March 30, 2014
 # https://vz.ru/news/2014/3/17/677464.html
 # From Tim Parenti (2022-07-01), per Paul Eggert (2014-03-30):
 # The clocks at the railway station in Simferopol were put forward from 22:00
 # to 24:00 the previous day in a "symbolic ceremony"; however, per
 # contemporaneous news reports, "ordinary Crimeans [made] the daylight savings
 # time switch at 2am" on Sunday.
 # https://www.business-standard.com/article/pti-stories/crimea-to-set-clocks-to-russia-time-114033000014_1.html
 # https://www.reuters.com/article/us-ukraine-crisis-crimea-time/crimea-switches-to-moscow-time-amid-incorporation-frenzy-idUKBREA2S0LT20140329
 # https://www.bbc.com/news/av/world-europe-26806583
 			 2:00	EU	EE%sT	2014 Mar 30  2:00
 			 4:00	-	MSK	2014 Oct 26  2:00s
 			 3:00	-	MSK
 
 
 # From Paul Eggert (2016-03-18):
 # Europe/Astrakhan covers:
 # 30	RU-AST	Astrakhan Oblast
 #
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
 # From Alexander Krivenyshev (2016-01-12):
 # On February 10, 2016 Astrakhan Oblast got approval by the Federation
 # Council to change its time zone to UTC+4 (from current UTC+3 Moscow time)....
 # This Federal Law shall enter into force on 27 March 2016 at 02:00.
 # From Matt Johnson (2016-03-09):
 # http://publication.pravo.gov.ru/Document/View/0001201602150056
 
 Zone Europe/Astrakhan	 3:12:12 -	LMT	1924 May
 			 3:00	-	+03	1930 Jun 21
 			 4:00	Russia	+04/+05	1989 Mar 26  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 4:00	-	+04	1992 Mar 29  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04	2014 Oct 26  2:00s
 			 3:00	-	+03	2016 Mar 27  2:00s
 			 4:00	-	+04
 
 # From Paul Eggert (2016-11-11):
 # Europe/Volgograd covers:
 # 34	RU-VGG	Volgograd Oblast
 # The 1988 transition is from USSR act No. 5 (1988-01-04).
 
 # From Alexander Fetisov (2018-09-20):
 # Volgograd region in southern Russia (Europe/Volgograd) change
 # timezone from UTC+3 to UTC+4 from 28oct2018.
 # http://sozd.parliament.gov.ru/bill/452878-7
 #
 # From Stepan Golosunov (2018-10-11):
 # The law has been published today on
 # http://publication.pravo.gov.ru/Document/View/0001201810110037
 
 # From Alexander Krivenyshev (2020-11-27):
 # The State Duma approved (Nov 24, 2020) the transition of the Volgograd
 # region to the Moscow time zone....
 # https://sozd.duma.gov.ru/bill/1012130-7
 #
 # From Stepan Golosunov (2020-12-05):
 # Currently proposed text for the second reading (expected on December 8) ...
 # changes the date to December 27. https://v1.ru/text/gorod/2020/12/04/69601031/
 #
 # From Stepan Golosunov (2020-12-22):
 # The law was published today on
 # http://publication.pravo.gov.ru/Document/View/0001202012220002
 
 Zone Europe/Volgograd	 2:57:40 -	LMT	1920 Jan  3
 			 3:00	-	+03	1930 Jun 21
 			 4:00	-	+04	1961 Nov 11
 			 4:00	Russia	+04/+05	1988 Mar 27  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 4:00	-	+04	1992 Mar 29  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04	2014 Oct 26  2:00s
 			 3:00	-	+03	2018 Oct 28  2:00s
 			 4:00	-	+04	2020 Dec 27  2:00s
 			 3:00	-	+03
 
 # From Paul Eggert (2016-11-11):
 # Europe/Saratov covers:
 # 64	RU-SAR	Saratov Oblast
 
 # From Yuri Konotopov (2016-11-11):
 # Dec 4, 2016 02:00 UTC+3....  Saratov Region's local time will be ... UTC+4.
 # From Stepan Golosunov (2016-11-11):
 # ... Byalokoz listed Saratov on 03:04:18.
 # From Stepan Golosunov (2016-11-22):
 # http://publication.pravo.gov.ru/Document/View/0001201611220031
 
 Zone Europe/Saratov	 3:04:18 -	LMT	1919 Jul  1  0:00u
 			 3:00	-	+03	1930 Jun 21
 			 4:00	Russia	+04/+05	1988 Mar 27  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 4:00	-	+04	1992 Mar 29  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04	2014 Oct 26  2:00s
 			 3:00	-	+03	2016 Dec  4  2:00s
 			 4:00	-	+04
 
 # From Paul Eggert (2016-03-18):
 # Europe/Kirov covers:
 # 43	RU-KIR	Kirov Oblast
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 #
 Zone Europe/Kirov	 3:18:48 -	LMT	1919 Jul  1  0:00u
 			 3:00	-	+03	1930 Jun 21
 			 4:00	Russia	+04/+05	1989 Mar 26  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 4:00	-	+04	1992 Mar 29  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04	2014 Oct 26  2:00s
 			 3:00	-	+03
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Europe/Samara covers...
 # 18	RU-UD	Udmurt Republic
 # 63	RU-SAM	Samara Oblast
 
 # From Paul Eggert (2016-03-18):
 # Byalokoz 1919 says Samara was 3:20:20.
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
 Zone Europe/Samara	 3:20:20 -	LMT	1919 Jul  1  0:00u
 			 3:00	-	+03	1930 Jun 21
 			 4:00	-	+04	1935 Jan 27
 			 4:00	Russia	+04/+05	1989 Mar 26  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 2:00	Russia	+02/+03	1991 Sep 29  2:00s
 			 3:00	-	+03	1991 Oct 20  3:00
 			 4:00	Russia	+04/+05	2010 Mar 28  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04
 
 # From Paul Eggert (2016-03-18):
 # Europe/Ulyanovsk covers:
 # 73	RU-ULY	Ulyanovsk Oblast
 
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
 # From Alexander Krivenyshev (2016-02-17):
 # Ulyanovsk ... on their way to change time zones by March 27, 2016 at 2am.
 # Ulyanovsk Oblast ... from MSK to MSK+1 (UTC+3 to UTC+4) ...
 # 920582-6 ... 02/17/2016 The State Duma passed the bill in the first reading.
 # From Matt Johnson (2016-03-09):
 # http://publication.pravo.gov.ru/Document/View/0001201603090051
 
 Zone Europe/Ulyanovsk	 3:13:36 -	LMT	1919 Jul  1  0:00u
 			 3:00	-	+03	1930 Jun 21
 			 4:00	Russia	+04/+05	1989 Mar 26  2:00s
 			 3:00	Russia	+03/+04	1991 Mar 31  2:00s
 			 2:00	Russia	+02/+03	1992 Jan 19  2:00s
 			 3:00	Russia	+03/+04	2011 Mar 27  2:00s
 			 4:00	-	+04	2014 Oct 26  2:00s
 			 3:00	-	+03	2016 Mar 27  2:00s
 			 4:00	-	+04
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Asia/Yekaterinburg covers...
 # 02	RU-BA	Bashkortostan, Republic of
 # 90	RU-PER	Perm Krai
 # 45	RU-KGN	Kurgan Oblast
 # 56	RU-ORE	Orenburg Oblast
 # 66	RU-SVE	Sverdlovsk Oblast
 # 72	RU-TYU	Tyumen Oblast
 # 74	RU-CHE	Chelyabinsk Oblast
 # 86	RU-KHM	Khanty-Mansi Autonomous Okrug - Yugra
 # 89	RU-YAN	Yamalo-Nenets Autonomous Okrug
 #
 # Note: Effective 2005-12-01, (59) Perm Oblast and (81) Komi-Permyak
 # Autonomous Okrug merged to form (90, RU-PER) Perm Krai.
 
 # Milne says Yekaterinburg was 4:02:32.9.
 # Byalokoz 1919 says its provincial time was based on Perm, at 3:45:05.
 # Assume it switched on 1916-07-03, the time of the new standard.
 # The 1919 and 1930 transitions are from Shanks.
 
 		#STDOFF	 4:02:32.9
 Zone Asia/Yekaterinburg	 4:02:33 -	LMT	1916 Jul  3
 			 3:45:05 -	PMT	1919 Jul 15  4:00
 			 4:00	-	+04	1930 Jun 21
 			 5:00	Russia	+05/+06	1991 Mar 31  2:00s
 			 4:00	Russia	+04/+05	1992 Jan 19  2:00s
 			 5:00	Russia	+05/+06	2011 Mar 27  2:00s
 			 6:00	-	+06	2014 Oct 26  2:00s
 			 5:00	-	+05
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Asia/Omsk covers...
 # 55	RU-OMS	Omsk Oblast
 
 # Byalokoz 1919 says Omsk was 4:53:30.
 
 Zone Asia/Omsk		 4:53:30 -	LMT	1919 Nov 14
 			 5:00	-	+05	1930 Jun 21
 			 6:00	Russia	+06/+07	1991 Mar 31  2:00s
 			 5:00	Russia	+05/+06	1992 Jan 19  2:00s
 			 6:00	Russia	+06/+07	2011 Mar 27  2:00s
 			 7:00	-	+07	2014 Oct 26  2:00s
 			 6:00	-	+06
 
 # From Paul Eggert (2016-02-22):
 # Asia/Barnaul covers:
 # 04	RU-AL	Altai Republic
 # 22	RU-ALT	Altai Krai
 
 # Data before 1991 are from Shanks & Pottenger.
 
 # From Stepan Golosunov (2016-03-07):
 # Letter of Bank of Russia from 1995-05-25
 # http://www.bestpravo.ru/rossijskoje/lj-akty/y3a.htm
 # suggests that Altai Republic transitioned to Moscow+3 on
 # 1995-05-28.
 #
 # https://regnum.ru/news/society/1957270.html
 # has some historical data for Altai Krai:
 # before 1957: west part on UT+6, east on UT+7
 # after 1957: UT+7
 # since 1995: UT+6
 # http://barnaul.rusplt.ru/index/pochemu_altajskij_kraj_okazalsja_v_neprivychnom_chasovom_pojase-17648.html
 # confirms that and provides more details including 1995-05-28 transition date.
 
 # From Alexander Krivenyshev (2016-02-17):
 # Altai Krai and Altai Republic on their way to change time zones
 # by March 27, 2016 at 2am....
 # Altai Republic / Gorno-Altaysk MSK+3 to MSK+4 (UTC+6 to UTC+7) ...
 # Altai Krai / Barnaul MSK+3 to MSK+4 (UTC+6 to UTC+7)
 # From Matt Johnson (2016-03-09):
 # http://publication.pravo.gov.ru/Document/View/0001201603090043
 # http://publication.pravo.gov.ru/Document/View/0001201603090038
 
 Zone Asia/Barnaul	 5:35:00 -	LMT	1919 Dec 10
 			 6:00	-	+06	1930 Jun 21
 			 7:00	Russia	+07/+08	1991 Mar 31  2:00s
 			 6:00	Russia	+06/+07	1992 Jan 19  2:00s
 			 7:00	Russia	+07/+08	1995 May 28
 			 6:00	Russia	+06/+07	2011 Mar 27  2:00s
 			 7:00	-	+07	2014 Oct 26  2:00s
 			 6:00	-	+06	2016 Mar 27  2:00s
 			 7:00	-	+07
 
 # From Paul Eggert (2016-03-18):
 # Asia/Novosibirsk covers:
 # 54	RU-NVS	Novosibirsk Oblast
 
 # From Stepan Golosunov (2016-05-30):
 # http://asozd2.duma.gov.ru/main.nsf/(Spravka)?OpenAgent&RN=1085784-6
 # moves Novosibirsk oblast from UTC+6 to UTC+7.
 # From Stepan Golosunov (2016-07-04):
 # The law was signed yesterday and published today on
 # http://publication.pravo.gov.ru/Document/View/0001201607040064
 
 Zone Asia/Novosibirsk	 5:31:40 -	LMT	1919 Dec 14  6:00
 			 6:00	-	+06	1930 Jun 21
 			 7:00	Russia	+07/+08	1991 Mar 31  2:00s
 			 6:00	Russia	+06/+07	1992 Jan 19  2:00s
 			 7:00	Russia	+07/+08	1993 May 23 # say Shanks & P.
 			 6:00	Russia	+06/+07	2011 Mar 27  2:00s
 			 7:00	-	+07	2014 Oct 26  2:00s
 			 6:00	-	+06	2016 Jul 24  2:00s
 			 7:00	-	+07
 
 # From Paul Eggert (2016-03-18):
 # Asia/Tomsk covers:
 # 70	RU-TOM	Tomsk Oblast
 
 # From Stepan Golosunov (2016-03-24):
 # Byalokoz listed Tomsk at 5:39:51.
 
 # From Stanislaw A. Kuzikowski (1994-06-29):
 # Tomsk is still 4 hours ahead of Moscow.
 
 # From Stepan Golosunov (2016-03-19):
 # http://pravo.gov.ru/proxy/ips/?docbody=&nd=102075743
 # (fifth time belt being UTC+5+1(decree time)
 # / UTC+5+1(decree time)+1(summer time)) ...
 # Note that time belts (numbered from 2 (Moscow) to 12 according to their
 # GMT/UTC offset and having too many exceptions like regions formally
 # belonging to one belt but using time from another) were replaced
 # with time zones in 2011 with different numbering (there was a
 # 2-hour gap between second and third zones in 2011-2014).
 
 # From Stepan Golosunov (2016-04-12):
 # http://asozd2.duma.gov.ru/main.nsf/(SpravkaNew)?OpenAgent&RN=1006865-6
 # This bill was approved in the first reading today.  It moves Tomsk oblast
 # from UTC+6 to UTC+7 and is supposed to come into effect on 2016-05-29 at
 # 2:00.  The bill needs to be approved in the second and the third readings by
 # the State Duma, approved by the Federation Council, signed by the President
 # and published to become a law.  Minor changes in the text are to be expected
 # before the second reading (references need to be updated to account for the
 # recent changes).
 #
 # Judging by the ultra-short one-day amendments period, recent similar laws,
 # the State Duma schedule and the Federation Council schedule
 # http://www.duma.gov.ru/legislative/planning/day-shedule/por_vesna_2016/
 # http://council.gov.ru/activity/meetings/schedule/63303
 # I speculate that the final text of the bill will be proposed tomorrow, the
 # bill will be approved in the second and the third readings on Friday,
 # approved by the Federation Council on 2016-04-20, signed by the President and
 # published as a law around 2016-04-26.
 
 # From Matt Johnson (2016-04-26):
 # http://publication.pravo.gov.ru/Document/View/0001201604260048
 
 Zone	Asia/Tomsk	 5:39:51 -	LMT	1919 Dec 22
 			 6:00	-	+06	1930 Jun 21
 			 7:00	Russia	+07/+08	1991 Mar 31  2:00s
 			 6:00	Russia	+06/+07	1992 Jan 19  2:00s
 			 7:00	Russia	+07/+08	2002 May  1  3:00
 			 6:00	Russia	+06/+07	2011 Mar 27  2:00s
 			 7:00	-	+07	2014 Oct 26  2:00s
 			 6:00	-	+06	2016 May 29  2:00s
 			 7:00	-	+07
 
 
 # From Tim Parenti (2014-07-03):
 # Asia/Novokuznetsk covers...
 # 42	RU-KEM	Kemerovo Oblast
 
 # From Alexander Krivenyshev (2009-10-13):
 # Kemerovo oblast' (Kemerovo region) in Russia will change current time zone on
 # March 28, 2010:
 # from current Russia Zone 6 - Krasnoyarsk Time Zone (KRA) UTC +0700
 # to Russia Zone 5 - Novosibirsk Time Zone (NOV) UTC +0600
 #
 # This is according to Government of Russia decree No. 740, on September
 # 14, 2009 "Application in the territory of the Kemerovo region the Fifth
 # time zone." ("Russia Zone 5" or old "USSR Zone 5" is GMT +0600)
 #
 # Russian Government web site (Russian language)
 # http://www.government.ru/content/governmentactivity/rfgovernmentdecisions/archive/2009/09/14/991633.htm
 # or Russian-English translation by WorldTimeZone.com with reference
 # map to local region and new Russia Time Zone map after March 28, 2010
 # http://www.worldtimezone.com/dst_news/dst_news_russia03.html
 #
 # Thus, when Russia will switch to DST on the night of March 28, 2010
 # Kemerovo region (Kemerovo oblast') will not change the clock.
 
 # From Tim Parenti (2014-07-02), per Alexander Krivenyshev (2014-07-02):
 # The Kemerovo region will remain at UTC+7 through the 2014-10-26 change, thus
 # realigning itself with KRAT.
 
 Zone Asia/Novokuznetsk	 5:48:48 -	LMT	1924 May  1
 			 6:00	-	+06	1930 Jun 21
 			 7:00	Russia	+07/+08	1991 Mar 31  2:00s
 			 6:00	Russia	+06/+07	1992 Jan 19  2:00s
 			 7:00	Russia	+07/+08	2010 Mar 28  2:00s
 			 6:00	Russia	+06/+07	2011 Mar 27  2:00s
 			 7:00	-	+07
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Asia/Krasnoyarsk covers...
 # 17	RU-TY	Tuva Republic
 # 19	RU-KK	Khakassia, Republic of
 # 24	RU-KYA	Krasnoyarsk Krai
 #
 # Note: Effective 2007-01-01, (88) Evenk Autonomous Okrug and (84) Taymyr
 # Autonomous Okrug were merged into (24, RU-KYA) Krasnoyarsk Krai.
 
 # Byalokoz 1919 says Krasnoyarsk was 6:11:26.
 
 Zone Asia/Krasnoyarsk	 6:11:26 -	LMT	1920 Jan  6
 			 6:00	-	+06	1930 Jun 21
 			 7:00	Russia	+07/+08	1991 Mar 31  2:00s
 			 6:00	Russia	+06/+07	1992 Jan 19  2:00s
 			 7:00	Russia	+07/+08	2011 Mar 27  2:00s
 			 8:00	-	+08	2014 Oct 26  2:00s
 			 7:00	-	+07
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Asia/Irkutsk covers...
 # 03	RU-BU	Buryatia, Republic of
 # 38	RU-IRK	Irkutsk Oblast
 #
 # Note: Effective 2008-01-01, (85) Ust-Orda Buryat Autonomous Okrug was
 # merged into (38, RU-IRK) Irkutsk Oblast.
 
 # Milne 1899 says Irkutsk was 6:57:15.
 # Byalokoz 1919 says Irkutsk was 6:57:05.
 # Go with Byalokoz.
 
 Zone Asia/Irkutsk	 6:57:05 -	LMT	1880
 			 6:57:05 -	IMT	1920 Jan 25 # Irkutsk Mean Time
 			 7:00	-	+07	1930 Jun 21
 			 8:00	Russia	+08/+09	1991 Mar 31  2:00s
 			 7:00	Russia	+07/+08	1992 Jan 19  2:00s
 			 8:00	Russia	+08/+09	2011 Mar 27  2:00s
 			 9:00	-	+09	2014 Oct 26  2:00s
 			 8:00	-	+08
 
 
 # From Tim Parenti (2014-07-06):
 # Asia/Chita covers...
 # 92	RU-ZAB	Zabaykalsky Krai
 #
 # Note: Effective 2008-03-01, (75) Chita Oblast and (80) Agin-Buryat
 # Autonomous Okrug merged to form (92, RU-ZAB) Zabaykalsky Krai.
 
 # From Alexander Krivenyshev (2016-01-02):
 # [The] time zone in the Trans-Baikal Territory (Zabaykalsky Krai) -
 # Asia/Chita [is changing] from UTC+8 to UTC+9.  Effective date will
 # be March 27, 2016 at 2:00am....
 # http://publication.pravo.gov.ru/Document/View/0001201512300107
 
 Zone Asia/Chita	 7:33:52 -	LMT	1919 Dec 15
 			 8:00	-	+08	1930 Jun 21
 			 9:00	Russia	+09/+10	1991 Mar 31  2:00s
 			 8:00	Russia	+08/+09	1992 Jan 19  2:00s
 			 9:00	Russia	+09/+10	2011 Mar 27  2:00s
 			10:00	-	+10	2014 Oct 26  2:00s
 			 8:00	-	+08	2016 Mar 27  2:00
 			 9:00	-	+09
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
 # Asia/Yakutsk covers...
 # 28	RU-AMU	Amur Oblast
 #
 # ...and parts of (14, RU-SA) Sakha (Yakutia) Republic:
 # 14-02	****	Aldansky District
 # 14-04	****	Amginsky District
 # 14-05	****	Anabarsky District
 # 14-06	****	Bulunsky District
 # 14-07	****	Verkhnevilyuysky District
 # 14-10	****	Vilyuysky District
 # 14-11	****	Gorny District
 # 14-12	****	Zhigansky District
 # 14-13	****	Kobyaysky District
 # 14-14	****	Lensky District
 # 14-15	****	Megino-Kangalassky District
 # 14-16	****	Mirninsky District
 # 14-18	****	Namsky District
 # 14-19	****	Neryungrinsky District
 # 14-21	****	Nyurbinsky District
 # 14-23	****	Olenyoksky District
 # 14-24	****	Olyokminsky District
 # 14-26	****	Suntarsky District
 # 14-27	****	Tattinsky District
 # 14-29	****	Ust-Aldansky District
 # 14-32	****	Khangalassky District
 # 14-33	****	Churapchinsky District
 # 14-34	****	Eveno-Bytantaysky National District
 
 # From Tim Parenti (2014-07-03):
 # Our commentary seems to have lost mention of (14-19) Neryungrinsky District.
 # Since the surrounding districts of Sakha are all YAKT, assume this is, too.
 # Also assume its history has been the same as the rest of Asia/Yakutsk.
 
 # Byalokoz 1919 says Yakutsk was 8:38:58.
 
 Zone Asia/Yakutsk	 8:38:58 -	LMT	1919 Dec 15
 			 8:00	-	+08	1930 Jun 21
 			 9:00	Russia	+09/+10	1991 Mar 31  2:00s
 			 8:00	Russia	+08/+09	1992 Jan 19  2:00s
 			 9:00	Russia	+09/+10	2011 Mar 27  2:00s
 			10:00	-	+10	2014 Oct 26  2:00s
 			 9:00	-	+09
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
 # Asia/Vladivostok covers...
 # 25	RU-PRI	Primorsky Krai
 # 27	RU-KHA	Khabarovsk Krai
 # 79	RU-YEV	Jewish Autonomous Oblast
 #
 # ...and parts of (14, RU-SA) Sakha (Yakutia) Republic:
 # 14-09	****	Verkhoyansky District
 # 14-31	****	Ust-Yansky District
 
 # Milne 1899 says Vladivostok was 8:47:33.5.
 # Byalokoz 1919 says Vladivostok was 8:47:31.
 # Go with Byalokoz.
 
 Zone Asia/Vladivostok	 8:47:31 -	LMT	1922 Nov 15
 			 9:00	-	+09	1930 Jun 21
 			10:00	Russia	+10/+11	1991 Mar 31  2:00s
 			 9:00	Russia	+09/+10	1992 Jan 19  2:00s
 			10:00	Russia	+10/+11	2011 Mar 27  2:00s
 			11:00	-	+11	2014 Oct 26  2:00s
 			10:00	-	+10
 
 
 # From Tim Parenti (2014-07-03):
 # Asia/Khandyga covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
 # 14-28	****	Tomponsky District
 # 14-30	****	Ust-Maysky District
 
 # From Arthur David Olson (2022-03-21):
 # Tomponsky and Ust-Maysky switched from Vladivostok time to Yakutsk time
 # in 2011.
 
 # From Paul Eggert (2012-11-25):
 # Shanks and Pottenger (2003) has Khandyga on Yakutsk time.
 # Make a wild guess that it switched to Vladivostok time in 2004.
 # This transition is no doubt wrong, but we have no better info.
 
 Zone Asia/Khandyga	 9:02:13 -	LMT	1919 Dec 15
 			 8:00	-	+08	1930 Jun 21
 			 9:00	Russia	+09/+10	1991 Mar 31  2:00s
 			 8:00	Russia	+08/+09	1992 Jan 19  2:00s
 			 9:00	Russia	+09/+10	2004
 			10:00	Russia	+10/+11	2011 Mar 27  2:00s
 			11:00	-	+11	2011 Sep 13  0:00s # Decree 725?
 			10:00	-	+10	2014 Oct 26  2:00s
 			 9:00	-	+09
 
 
 # From Tim Parenti (2014-07-03):
 # Asia/Sakhalin covers...
 # 65	RU-SAK	Sakhalin Oblast
 # ...with the exception of:
 # 65-11	****	Severo-Kurilsky District (North Kuril Islands)
 
 # From Matt Johnson (2016-02-22):
 # Asia/Sakhalin is moving (in entirety) from UTC+10 to UTC+11 ...
 # (2016-03-09):
 # http://publication.pravo.gov.ru/Document/View/0001201603090044
 
 # The Zone name should be Asia/Yuzhno-Sakhalinsk, but that's too long.
 Zone Asia/Sakhalin	 9:30:48 -	LMT	1905 Aug 23
 			 9:00	-	+09	1945 Aug 25
 			11:00	Russia	+11/+12	1991 Mar 31  2:00s # Sakhalin T
 			10:00	Russia	+10/+11	1992 Jan 19  2:00s
 			11:00	Russia	+11/+12	1997 Mar lastSun  2:00s
 			10:00	Russia	+10/+11	2011 Mar 27  2:00s
 			11:00	-	+11	2014 Oct 26  2:00s
 			10:00	-	+10	2016 Mar 27  2:00s
 			11:00	-	+11
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2009-11-29):
 # Asia/Magadan covers...
 # 49	RU-MAG	Magadan Oblast
 
 # From Tim Parenti (2014-07-06), per Alexander Krivenyshev (2014-07-02):
 # Magadan Oblast is moving from UTC+12 to UTC+10 on 2014-10-26; however,
 # several districts of Sakha Republic as well as Severo-Kurilsky District of
 # the Sakhalin Oblast (also known as the North Kuril Islands), represented
 # until now by Asia/Magadan, will instead move to UTC+11.  These regions will
 # need their own zone.
 
 # From Alexander Krivenyshev (2016-03-27):
 # ... draft bill 948300-6 to change its time zone from UTC+10 to UTC+11 ...
 # will take ... effect ... on April 24, 2016 at 2 o'clock
 #
 # From Matt Johnson (2016-04-05):
 # ... signed by the President today ...
 # http://publication.pravo.gov.ru/Document/View/0001201604050038
 
 Zone Asia/Magadan	10:03:12 -	LMT	1924 May  2
 			10:00	-	+10	1930 Jun 21 # Magadan Time
 			11:00	Russia	+11/+12	1991 Mar 31  2:00s
 			10:00	Russia	+10/+11	1992 Jan 19  2:00s
 			11:00	Russia	+11/+12	2011 Mar 27  2:00s
 			12:00	-	+12	2014 Oct 26  2:00s
 			10:00	-	+10	2016 Apr 24  2:00s
 			11:00	-	+11
 
 
 # From Tim Parenti (2014-07-06):
 # Asia/Srednekolymsk covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
 # 14-01	****	Abyysky District
 # 14-03	****	Allaikhovsky District
 # 14-08	****	Verkhnekolymsky District
 # 14-17	****	Momsky District
 # 14-20	****	Nizhnekolymsky District
 # 14-25	****	Srednekolymsky District
 #
 # ...and parts of (65, RU-SAK) Sakhalin Oblast:
 # 65-11	****	Severo-Kurilsky District (North Kuril Islands)
 
 # From Tim Parenti (2014-07-02):
 # Oymyakonsky District of Sakha Republic (represented by Ust-Nera), along with
 # most of Sakhalin Oblast (represented by Sakhalin) will be moving to UTC+10 on
 # 2014-10-26 to stay aligned with VLAT/SAKT; however, Severo-Kurilsky District
 # of the Sakhalin Oblast (also known as the North Kuril Islands, represented by
 # Severo-Kurilsk) will remain on UTC+11.
 
 # From Tim Parenti (2014-07-06):
 # Assume North Kuril Islands have history like Magadan before 2011-03-27.
 # There is a decent chance this is wrong, in which case a new zone
 # Asia/Severo-Kurilsk would become necessary.
 #
 # Srednekolymsk and Zyryanka are the most populous places amongst these
 # districts, but have very similar populations.  In fact, Wikipedia currently
 # lists them both as having 3528 people, exactly 1668 males and 1860 females
 # each!  (Yikes!)
 # https://en.wikipedia.org/w/?title=Srednekolymsky_District&oldid=603435276
 # https://en.wikipedia.org/w/?title=Verkhnekolymsky_District&oldid=594378493
 # Assume this is a mistake, albeit an amusing one.
 #
 # Looking at censuses, the populations of the two municipalities seem to have
 # fluctuated recently.  Zyryanka was more populous than Srednekolymsk in the
 # 1989 and 2002 censuses, but Srednekolymsk was more populous in the most
 # recent (2010) census, 3525 to 3170.  (See pages 195 and 197 of
 # http://www.gks.ru/free_doc/new_site/perepis2010/croc/Documents/Vol1/pub-01-05.pdf
 # in Russian.)  In addition, Srednekolymsk appears to be a much older
 # settlement and the population of Zyryanka seems to be declining.
 # Go with Srednekolymsk.
 
 Zone Asia/Srednekolymsk	10:14:52 -	LMT	1924 May  2
 			10:00	-	+10	1930 Jun 21
 			11:00	Russia	+11/+12	1991 Mar 31  2:00s
 			10:00	Russia	+10/+11	1992 Jan 19  2:00s
 			11:00	Russia	+11/+12	2011 Mar 27  2:00s
 			12:00	-	+12	2014 Oct 26  2:00s
 			11:00	-	+11
 
 
 # From Tim Parenti (2014-07-03):
 # Asia/Ust-Nera covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
 # 14-22	****	Oymyakonsky District
 
 # From Arthur David Olson (2022-03-21):
 # Oymyakonsky and the Kuril Islands switched from
 # Magadan time to Vladivostok time in 2011.
 #
 # From Tim Parenti (2014-07-06), per Alexander Krivenyshev (2014-07-02):
 # It's unlikely that any of the Kuril Islands were involved in such a switch,
 # as the South and Middle Kurils have been on UTC+11 (SAKT) with the rest of
 # Sakhalin Oblast since at least 2011-09, and the North Kurils have been on
 # UTC+12 since at least then, too.
 
 Zone Asia/Ust-Nera	 9:32:54 -	LMT	1919 Dec 15
 			 8:00	-	+08	1930 Jun 21
 			 9:00	Russia	+09/+10	1981 Apr  1
 			11:00	Russia	+11/+12	1991 Mar 31  2:00s
 			10:00	Russia	+10/+11	1992 Jan 19  2:00s
 			11:00	Russia	+11/+12	2011 Mar 27  2:00s
 			12:00	-	+12	2011 Sep 13  0:00s # Decree 725?
 			11:00	-	+11	2014 Oct 26  2:00s
 			10:00	-	+10
 
 
 # From Tim Parenti (2014-07-03), per Oscar van Vlijmen (2001-08-25):
 # Asia/Kamchatka covers...
 # 91	RU-KAM	Kamchatka Krai
 #
 # Note: Effective 2007-07-01, (41) Kamchatka Oblast and (82) Koryak
 # Autonomous Okrug merged to form (91, RU-KAM) Kamchatka Krai.
 
 # The Zone name should be Asia/Petropavlovsk-Kamchatski or perhaps
 # Asia/Petropavlovsk-Kamchatsky, but these are too long.
 Zone Asia/Kamchatka	10:34:36 -	LMT	1922 Nov 10
 			11:00	-	+11	1930 Jun 21
 			12:00	Russia	+12/+13	1991 Mar 31  2:00s
 			11:00	Russia	+11/+12	1992 Jan 19  2:00s
 			12:00	Russia	+12/+13	2010 Mar 28  2:00s
 			11:00	Russia	+11/+12	2011 Mar 27  2:00s
 			12:00	-	+12
 
 
 # From Tim Parenti (2014-07-03):
 # Asia/Anadyr covers...
 # 87	RU-CHU	Chukotka Autonomous Okrug
 
 Zone Asia/Anadyr	11:49:56 -	LMT	1924 May  2
 			12:00	-	+12	1930 Jun 21
 			13:00	Russia	+13/+14	1982 Apr  1  0:00s
 			12:00	Russia	+12/+13	1991 Mar 31  2:00s
 			11:00	Russia	+11/+12	1992 Jan 19  2:00s
 			12:00	Russia	+12/+13	2010 Mar 28  2:00s
 			11:00	Russia	+11/+12	2011 Mar 27  2:00s
 			12:00	-	+12
 
 # Bosnia & Herzegovina
 # Croatia
 # Kosovo
 # Montenegro
 # North Macedonia
 # Serbia
 # Slovenia
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Belgrade	1:22:00	-	LMT	1884
 			1:00	-	CET	1941 Apr 18 23:00
 			1:00	C-Eur	CE%sT	1945
 			1:00	-	CET	1945 May  8  2:00s
 			1:00	1:00	CEST	1945 Sep 16  2:00s
 # Metod Koželj reports that the legal date of
 # transition to EU rules was 1982-11-27, for all of Yugoslavia at the time.
 # Shanks & Pottenger don't give as much detail, so go with Koželj.
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
 # Spain
 #
 # From Paul Eggert (2016-12-14):
 #
 # The source for Europe/Madrid before 2013 is:
 # Planesas P. La hora oficial en España y sus cambios.
 # Anuario del Observatorio Astronómico de Madrid (2013, in Spanish).
 # http://astronomia.ign.es/rknowsys-theme/images/webAstro/paginas/documentos/Anuario/lahoraoficialenespana.pdf
 # As this source says that historical time in the Canaries is obscure,
 # and it does not discuss Ceuta, stick with Shanks for now for that data.
 #
 # In the 1918 and 1919 fallback transitions in Spain, the clock for
 # the hour-longer day officially kept going after midnight, so that
 # the repeated instances of that day's 00:00 hour were 24 hours apart,
 # with a fallback transition from the second occurrence of 00:59... to
 # the next day's 00:00.  Our data format cannot represent this
 # directly, and instead repeats the first hour of the next day, with a
 # fallback transition from the next day's 00:59... to 00:00.
 
 # From Michael Deckers (2016-12-15):
 # The Royal Decree of 1900-07-26 quoted by Planesas, online at
 # https://www.boe.es/datos/pdfs/BOE//1900/209/A00383-00384.pdf
 # says in its article 5 (my translation):
 # These dispositions will enter into force beginning with the
 # instant at which, according to the time indicated in article 1,
 # the 1st day of January of 1901 will begin.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Spain	1918	only	-	Apr	15	23:00	1:00	S
 Rule	Spain	1918	1919	-	Oct	 6	24:00s	0	-
 Rule	Spain	1919	only	-	Apr	 6	23:00	1:00	S
 Rule	Spain	1924	only	-	Apr	16	23:00	1:00	S
 Rule	Spain	1924	only	-	Oct	 4	24:00s	0	-
 Rule	Spain	1926	only	-	Apr	17	23:00	1:00	S
 Rule	Spain	1926	1929	-	Oct	Sat>=1	24:00s	0	-
 Rule	Spain	1927	only	-	Apr	 9	23:00	1:00	S
 Rule	Spain	1928	only	-	Apr	15	 0:00	1:00	S
 Rule	Spain	1929	only	-	Apr	20	23:00	1:00	S
 # Republican Spain during the civil war; it controlled Madrid until 1939-03-28.
 Rule	Spain	1937	only	-	Jun	16	23:00	1:00	S
 Rule	Spain	1937	only	-	Oct	 2	24:00s	0	-
 Rule	Spain	1938	only	-	Apr	 2	23:00	1:00	S
 Rule	Spain	1938	only	-	Apr	30	23:00	2:00	M
 Rule	Spain	1938	only	-	Oct	 2	24:00	1:00	S
 # The following rules are for unified Spain again.
 #
 # Planesas does not say what happened in Madrid between its fall on
 # 1939-03-28 and the Nationalist spring-forward transition on
 # 1939-04-15.  For lack of better info, assume Madrid's clocks did not
 # change during that period.
 #
 # The first rule is commented out, as it is redundant for Republican Spain.
 #Rule	Spain	1939	only	-	Apr	15	23:00	1:00	S
 Rule	Spain	1939	only	-	Oct	 7	24:00s	0	-
 Rule	Spain	1942	only	-	May	 2	23:00	1:00	S
 Rule	Spain	1942	only	-	Sep	 1	 1:00	0	-
 Rule	Spain	1943	1946	-	Apr	Sat>=13	23:00	1:00	S
 Rule	Spain	1943	1944	-	Oct	Sun>=1	 1:00	0	-
 Rule	Spain	1945	1946	-	Sep	lastSun	 1:00	0	-
 Rule	Spain	1949	only	-	Apr	30	23:00	1:00	S
 Rule	Spain	1949	only	-	Oct	 2	 1:00	0	-
 Rule	Spain	1974	1975	-	Apr	Sat>=12	23:00	1:00	S
 Rule	Spain	1974	1975	-	Oct	Sun>=1	 1:00	0	-
 Rule	Spain	1976	only	-	Mar	27	23:00	1:00	S
 Rule	Spain	1976	1977	-	Sep	lastSun	 1:00	0	-
 Rule	Spain	1977	only	-	Apr	 2	23:00	1:00	S
 Rule	Spain	1978	only	-	Apr	 2	 2:00s	1:00	S
 Rule	Spain	1978	only	-	Oct	 1	 2:00s	0	-
 # Nationalist Spain during the civil war
 #Rule NatSpain	1937	only	-	May	22	23:00	1:00	S
 #Rule NatSpain	1937	1938	-	Oct	Sat>=1	24:00s	0	-
 #Rule NatSpain	1938	only	-	Mar	26	23:00	1:00	S
 # The following rules are copied from Morocco from 1967 through 1978,
 # except with "S" letters.
 Rule SpainAfrica 1967	only	-	Jun	 3	12:00	1:00	S
 Rule SpainAfrica 1967	only	-	Oct	 1	 0:00	0	-
 Rule SpainAfrica 1974	only	-	Jun	24	 0:00	1:00	S
 Rule SpainAfrica 1974	only	-	Sep	 1	 0:00	0	-
 Rule SpainAfrica 1976	1977	-	May	 1	 0:00	1:00	S
 Rule SpainAfrica 1976	only	-	Aug	 1	 0:00	0	-
 Rule SpainAfrica 1977	only	-	Sep	28	 0:00	0	-
 Rule SpainAfrica 1978	only	-	Jun	 1	 0:00	1:00	S
 Rule SpainAfrica 1978	only	-	Aug	 4	 0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Madrid	-0:14:44 -	LMT	1901 Jan  1  0:00u
 			 0:00	Spain	WE%sT	1940 Mar 16 23:00
 			 1:00	Spain	CE%sT	1979
 			 1:00	EU	CE%sT
 Zone	Africa/Ceuta	-0:21:16 -	LMT	1901 Jan  1  0:00u
 			 0:00	-	WET	1918 May  6 23:00
 			 0:00	1:00	WEST	1918 Oct  7 23:00
 			 0:00	-	WET	1924
 			 0:00	Spain	WE%sT	1929
 			 0:00	-	WET	1967 # Help zishrink.awk.
 			 0:00 SpainAfrica WE%sT	1984 Mar 16
 			 1:00	-	CET	1986
 			 1:00	EU	CE%sT
 Zone	Atlantic/Canary	-1:01:36 -	LMT	1922 Mar # Las Palmas de Gran C.
 			-1:00	-	-01	1946 Sep 30  1:00
 			 0:00	-	WET	1980 Apr  6  0:00s
 			 0:00	1:00	WEST	1980 Sep 28  1:00u
 			 0:00	EU	WE%sT
 # IATA SSIM (1996-09) says the Canaries switch at 2:00u, not 1:00u.
 # Ignore this for now, as the Canaries are part of the EU.
 
 
 # Germany (Busingen enclave)
 # Liechtenstein
 # Switzerland
 #
 # From Howse:
 # By the end of the 18th century clocks and watches became commonplace
 # and their performance improved enormously.  Communities began to keep
 # mean time in preference to apparent time - Geneva from 1780 ....
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # From Whitman (who writes "Midnight?"):
 # Rule	Swiss	1940	only	-	Nov	 2	0:00	1:00	S
 # Rule	Swiss	1940	only	-	Dec	31	0:00	0	-
 # From Shanks & Pottenger:
 # Rule	Swiss	1941	1942	-	May	Sun>=1	2:00	1:00	S
 # Rule	Swiss	1941	1942	-	Oct	Sun>=1	0:00	0	-
 
 # From Alois Treindl (2008-12-17):
 # I have researched the DST usage in Switzerland during the 1940ies.
 #
 # As I wrote in an earlier message, I suspected the current tzdata values
 # to be wrong. This is now verified.
 #
 # I have found copies of the original ruling by the Swiss Federal
 # government, in 'Eidgenössische Gesetzessammlung 1941 and 1942' (Swiss
 # federal law collection)...
 #
 # DST began on Monday 5 May 1941, 1:00 am by shifting the clocks to 2:00 am
 # DST ended on Monday 6 Oct 1941, 2:00 am by shifting the clocks to 1:00 am.
 #
 # DST began on Monday, 4 May 1942 at 01:00 am
 # DST ended on Monday, 5 Oct 1942 at 02:00 am
 #
 # There was no DST in 1940, I have checked the law collection carefully.
 # It is also indicated by the fact that the 1942 entry in the law
 # collection points back to 1941 as a reference, but no reference to any
 # other years are made.
 #
 # Newspaper articles I have read in the archives on 6 May 1941 reported
 # about the introduction of DST (Sommerzeit in German) during the previous
 # night as an absolute novelty, because this was the first time that such
 # a thing had happened in Switzerland.
 #
 # I have also checked 1916, because one book source (Gabriel, Traité de
 # l'heure dans le monde) claims that Switzerland had DST in 1916. This is
 # false, no official document could be found. Probably Gabriel got misled
 # by references to Germany, which introduced DST in 1916 for the first time.
 #
 # The tzdata rules for Switzerland must be changed to:
 # Rule  Swiss   1941    1942    -       May     Mon>=1  1:00    1:00    S
 # Rule  Swiss   1941    1942    -       Oct     Mon>=1  2:00    0       -
 #
 # The 1940 rules must be deleted.
 #
 # One further detail for Switzerland, which is probably out of scope for
 # most users of tzdata: The [Europe/Zurich zone] ...
 # describes all of Switzerland correctly, with the exception of
 # the Canton de Genève (Geneva, Genf). Between 1848 and 1894 Geneva did not
 # follow Bern Mean Time but kept its own local mean time.
 # To represent this, an extra zone would be needed.
 #
 # From Alois Treindl (2013-09-11):
 # The Federal regulations say
 # https://www.admin.ch/opc/de/classified-compilation/20071096/index.html
 # ... the meridian for Bern mean time ... is 7° 26' 22.50".
 # Expressed in time, it is 0h29m45.5s.
 
 # From Pierre-Yves Berger (2013-09-11):
 # the "Circulaire du conseil fédéral" (December 11 1893)
 # http://www.amtsdruckschriften.bar.admin.ch/viewOrigDoc.do?id=10071353
 # clearly states that the [1894-06-01] change should be done at midnight
 # but if no one is present after 11 at night, could be postponed until one
 # hour before the beginning of service.
 
 # From Paul Eggert (2013-09-11):
 # Round BMT to the nearest even second, 0:29:46.
 #
 # We can find no reliable source for Shanks's assertion that all of Switzerland
 # except Geneva switched to Bern Mean Time at 00:00 on 1848-09-12.  This book:
 #
 #	Jakob Messerli. Gleichmässig, pünktlich, schnell. Zeiteinteilung und
 #	Zeitgebrauch in der Schweiz im 19. Jahrhundert. Chronos, Zurich 1995,
 #	ISBN 3-905311-68-2, OCLC 717570797.
 #
 # suggests that the transition was more gradual, and that the Swiss did not
 # agree about civil time during the transition.  The timekeeping it gives the
 # most detail for is postal and telegraph time: here, federal legislation (the
 # "Bundesgesetz über die Erstellung von elektrischen Telegraphen") passed on
 # 1851-11-23, and an official implementation notice was published 1853-07-16
 # (Bundesblatt 1853, Bd. II, S. 859).  On p 72 Messerli writes that in
 # practice since July 1853 Bernese time was used in "all postal and telegraph
 # offices in Switzerland from Geneva to St. Gallen and Basel to Chiasso"
 # (Google translation).  For now, model this transition as occurring on
 # 1853-07-16, though it probably occurred at some other date in Zurich, and
 # legal civil time probably changed at still some other transition date.
 
 # From Tobias Conradi (2011-09-12):
 # Büsingen , surrounded by the Swiss canton
 # Schaffhausen, did not start observing DST in 1980 as the rest of DE
 # (West Germany at that time) and DD (East Germany at that time) did.
 # DD merged into DE, the area is currently covered by code DE in ISO 3166-1,
 # which in turn is covered by the zone Europe/Berlin.
 #
 # Source for the time in Büsingen 1980:
 # http://www.srf.ch/player/video?id=c012c029-03b7-4c2b-9164-aa5902cd58d3
 #
 # From Arthur David Olson (2012-03-03):
 # Büsingen and Zurich have shared clocks since 1970.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Swiss	1941	1942	-	May	Mon>=1	1:00	1:00	S
 Rule	Swiss	1941	1942	-	Oct	Mon>=1	2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Zurich	0:34:08 -	LMT	1853 Jul 16 # See above comment.
 			0:29:46	-	BMT	1894 Jun    # Bern Mean Time
 			1:00	Swiss	CE%sT	1981
 			1:00	EU	CE%sT
 
 # Turkey
 
 # From Alois Treindl (2019-08-12):
 # http://www.astrolojidergisi.com/yazsaati.htm has researched the time zone
 # history of Turkey, based on newspaper archives and official documents.
 # From Paul Eggert (2019-08-28):
 # That source (Oya Vulaş, "Türkiye'de Yaz Saati Uygulamaları")
 # is used for 1940/1972, where it seems more reliable than our other
 # sources.
 
 # From Kıvanç Yazan (2019-08-12):
 # http://www.resmigazete.gov.tr/arsiv/14539.pdf#page=24
 # 1973-06-03 01:00 -> 02:00, 1973-11-04 02:00 -> 01:00
 #
 # http://www.resmigazete.gov.tr/arsiv/14829.pdf#page=1
 # 1974-03-31 02:00 -> 03:00, 1974-11-03 02:00 -> 01:00
 #
 # http://www.resmigazete.gov.tr/arsiv/15161.pdf#page=1
 # 1975-03-22 02:00 -> 03:00, 1975-11-02 02:00 -> 01:00
 #
 # http://www.resmigazete.gov.tr/arsiv/15535_1.pdf#page=1
 # 1976-03-21 02:00 -> 03:00, 1976-10-31 02:00 -> 01:00
 #
 # http://www.resmigazete.gov.tr/arsiv/15778.pdf#page=5
 # 1977-04-03 02:00 -> 03:00, 1977-10-16 02:00 -> 01:00,
 # 1978-04-02 02:00 -> 03:00 (not applied, see below)
 # 1978-10-15 02:00 -> 01:00 (not applied, see below)
 # 1979-04-01 02:00 -> 03:00 (not applied, see below)
 # 1979-10-14 02:00 -> 01:00 (not applied, see below)
 #
 # http://www.resmigazete.gov.tr/arsiv/16245.pdf#page=17
 # This cancels the previous decision, and repeats it only for 1978.
 # 1978-04-02 02:00 -> 03:00, 1978-10-15 02:00 -> 01:00
 # (not applied due to standard TZ change below)
 #
 # http://www.resmigazete.gov.tr/arsiv/16331.pdf#page=3
 # This decision changes the default longitude for Turkish time zone from 30
 # degrees East to 45 degrees East.  This means a standard TZ change, from +2
 # to +3.  This is published & applied on 1978-06-29.  At that time, Turkey was
 # already on summer time (already on 45E).  Hence, this new law just meant an
 # "continuous summer time".  Note that this was reversed in a few years.
 #
 # http://www.resmigazete.gov.tr/arsiv/18119_1.pdf#page=1
 # 1983-07-31 02:00 -> 03:00 (note that this jumps TZ to +4)
 # 1983-10-02 02:00 -> 01:00 (back to +3)
 #
 # http://www.resmigazete.gov.tr/arsiv/18561.pdf (page 1 and 34)
 # At this time, Turkey is still on +3 with no spring-forward on early
 # 1984.  This decision is published on 10/31/1984.  Page 1 declares
 # the decision of reverting the "default longitude change".  So the
 # standard time should go back to +3 (30E).  And page 34 explains when
 # that will happen: 1984-11-01 02:00 -> 01:00.  You can think of this
 # as "end of continuous summer time, change of standard time zone".
 #
 # http://www.resmigazete.gov.tr/arsiv/18713.pdf#page=1
 # 1985-04-20 01:00 -> 02:00, 1985-09-28 02:00 -> 01:00
 
 # From Kıvanç Yazan (2016-09-25):
 # 1) For 1986-2006, DST started at 01:00 local and ended at 02:00 local, with
 #    no exceptions.
 # 2) 1994's lastSun was overridden with Mar 20 ...
 # Here are official papers:
 # http://www.resmigazete.gov.tr/arsiv/19032.pdf#page=2 for 1986
 # http://www.resmigazete.gov.tr/arsiv/19400.pdf#page=4 for 1987
 # http://www.resmigazete.gov.tr/arsiv/19752.pdf#page=15 for 1988
 # http://www.resmigazete.gov.tr/arsiv/20102.pdf#page=6 for 1989
 # http://www.resmigazete.gov.tr/arsiv/20464.pdf#page=1 for 1990 - 1992
 # http://www.resmigazete.gov.tr/arsiv/21531.pdf#page=15 for 1993 - 1995
 # http://www.resmigazete.gov.tr/arsiv/21879.pdf#page=1 for overriding 1994
 # http://www.resmigazete.gov.tr/arsiv/22588.pdf#page=1 for 1996, 1997
 # http://www.resmigazete.gov.tr/arsiv/23286.pdf#page=10 for 1998 - 2000
 # http://www.resmigazete.gov.tr/eskiler/2001/03/20010324.htm#2  - for 2001
 # http://www.resmigazete.gov.tr/eskiler/2002/03/20020316.htm#2  - for 2002-2006
 # From Paul Eggert (2016-09-25):
 # Prefer the above sources to Shanks & Pottenger for timestamps after 1985.
 
 # From Steffen Thorsen (2007-03-09):
 # Starting 2007 though, it seems that they are adopting EU's 1:00 UTC
 # start/end time, according to the following page (2007-03-07):
 # http://www.ntvmsnbc.com/news/402029.asp
 # The official document is located here - it is in Turkish...:
 # http://rega.basbakanlik.gov.tr/eskiler/2007/03/20070307-7.htm
 # I was able to locate the following seemingly official document
 # (on a non-government server though) describing dates between 2002 and 2006:
 # http://www.alomaliye.com/bkk_2002_3769.htm
 
 # From Gökdeniz Karadağ (2011-03-10):
 # According to the articles linked below, Turkey will change into summer
 # time zone (GMT+3) on March 28, 2011 at 3:00 a.m. instead of March 27.
 # This change is due to a nationwide exam on 27th.
 # https://www.worldbulletin.net/?aType=haber&ArticleID=70872
 # Turkish:
 # https://www.hurriyet.com.tr/yaz-saati-uygulamasi-bir-gun-ileri-alindi-17230464
 
 # From Faruk Pasin (2014-02-14):
 # The DST for Turkey has been changed for this year because of the
 # Turkish Local election....
 # http://www.sabah.com.tr/Ekonomi/2014/02/12/yaz-saatinde-onemli-degisiklik
 # ... so Turkey will move clocks forward one hour on March 31 at 3:00 a.m.
 # From Randal L. Schwartz (2014-04-15):
 # Having landed on a flight from the states to Istanbul (via AMS) on March 31,
 # I can tell you that NOBODY (even the airlines) respected this timezone DST
 # change delay.  Maybe the word just didn't get out in time.
 # From Paul Eggert (2014-06-15):
 # The press reported massive confusion, as election officials obeyed the rule
 # change but cell phones (and airline baggage systems) did not.  See:
 # Kostidis M. Eventful elections in Turkey. Balkan News Agency
 # http://www.balkaneu.com/eventful-elections-turkey/ 2014-03-30.
 # I guess the best we can do is document the official time.
 
 # From Fatih (2015-09-29):
 # It's officially announced now by the Ministry of Energy.
 # Turkey delays winter time to 8th of November 04:00
 # http://www.aa.com.tr/tr/turkiye/yaz-saati-uygulamasi-8-kasimda-sona-erecek/362217
 #
 # From BBC News (2015-10-25):
 # Confused Turks are asking "what's the time?" after automatic clocks defied a
 # government decision ... "For the next two weeks #Turkey is on EEST... Erdogan
 # Engineered Standard Time," said Twitter user @aysekarahasan.
 # http://www.bbc.com/news/world-europe-34631326
 
 # From Burak AYDIN (2016-09-08):
 # Turkey will stay in Daylight Saving Time even in winter....
 # http://www.resmigazete.gov.tr/eskiler/2016/09/20160908-2.pdf
 #
 # From Paul Eggert (2016-09-07):
 # The change is permanent, so this is the new standard time in Turkey.
 # It takes effect today, which is not much notice.
 
 # From Kıvanç Yazan (2017-10-28):
 # Turkey will go back to Daylight Saving Time starting 2018-10.
 # http://www.resmigazete.gov.tr/eskiler/2017/10/20171028-5.pdf
 #
 # From Even Scharning (2017-11-08):
 # ... today it was announced that the DST will become "continuous":
 # http://www.hurriyet.com.tr/son-dakika-yaz-saati-uygulamasi-surekli-hale-geldi-40637482
 # From Paul Eggert (2017-11-08):
 # Although Google Translate misfires on that source, it looks like
 # Turkey reversed last month's decision, and so will stay at +03.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Turkey	1916	only	-	May	 1	0:00	1:00	S
 Rule	Turkey	1916	only	-	Oct	 1	0:00	0	-
 Rule	Turkey	1920	only	-	Mar	28	0:00	1:00	S
 Rule	Turkey	1920	only	-	Oct	25	0:00	0	-
 Rule	Turkey	1921	only	-	Apr	 3	0:00	1:00	S
 Rule	Turkey	1921	only	-	Oct	 3	0:00	0	-
 Rule	Turkey	1922	only	-	Mar	26	0:00	1:00	S
 Rule	Turkey	1922	only	-	Oct	 8	0:00	0	-
 # Whitman gives 1923 Apr 28 - Sep 16 and no DST in 1924-1925;
 # go with Shanks & Pottenger.
 Rule	Turkey	1924	only	-	May	13	0:00	1:00	S
 Rule	Turkey	1924	1925	-	Oct	 1	0:00	0	-
 Rule	Turkey	1925	only	-	May	 1	0:00	1:00	S
 Rule	Turkey	1940	only	-	Jul	 1	0:00	1:00	S
 Rule	Turkey	1940	only	-	Oct	 6	0:00	0	-
 Rule	Turkey	1940	only	-	Dec	 1	0:00	1:00	S
 Rule	Turkey	1941	only	-	Sep	21	0:00	0	-
 Rule	Turkey	1942	only	-	Apr	 1	0:00	1:00	S
 Rule	Turkey	1945	only	-	Oct	 8	0:00	0	-
 Rule	Turkey	1946	only	-	Jun	 1	0:00	1:00	S
 Rule	Turkey	1946	only	-	Oct	 1	0:00	0	-
 Rule	Turkey	1947	1948	-	Apr	Sun>=16	0:00	1:00	S
 Rule	Turkey	1947	1951	-	Oct	Sun>=2	0:00	0	-
 Rule	Turkey	1949	only	-	Apr	10	0:00	1:00	S
 Rule	Turkey	1950	only	-	Apr	16	0:00	1:00	S
 Rule	Turkey	1951	only	-	Apr	22	0:00	1:00	S
 # DST for 15 months; unusual but we'll let it pass.
 Rule	Turkey	1962	only	-	Jul	15	0:00	1:00	S
 Rule	Turkey	1963	only	-	Oct	30	0:00	0	-
 Rule	Turkey	1964	only	-	May	15	0:00	1:00	S
 Rule	Turkey	1964	only	-	Oct	 1	0:00	0	-
 Rule	Turkey	1973	only	-	Jun	 3	1:00	1:00	S
 Rule	Turkey	1973	1976	-	Oct	Sun>=31	2:00	0	-
 Rule	Turkey	1974	only	-	Mar	31	2:00	1:00	S
 Rule	Turkey	1975	only	-	Mar	22	2:00	1:00	S
 Rule	Turkey	1976	only	-	Mar	21	2:00	1:00	S
 Rule	Turkey	1977	1978	-	Apr	Sun>=1	2:00	1:00	S
 Rule	Turkey	1977	1978	-	Oct	Sun>=15	2:00	0	-
 Rule	Turkey	1978	only	-	Jun	29	0:00	0	-
 Rule	Turkey	1983	only	-	Jul	31	2:00	1:00	S
 Rule	Turkey	1983	only	-	Oct	 2	2:00	0	-
 Rule	Turkey	1985	only	-	Apr	20	1:00s	1:00	S
 Rule	Turkey	1985	only	-	Sep	28	1:00s	0	-
 Rule	Turkey	1986	1993	-	Mar	lastSun	1:00s	1:00	S
 Rule	Turkey	1986	1995	-	Sep	lastSun	1:00s	0	-
 Rule	Turkey	1994	only	-	Mar	20	1:00s	1:00	S
 Rule	Turkey	1995	2006	-	Mar	lastSun	1:00s	1:00	S
 Rule	Turkey	1996	2006	-	Oct	lastSun	1:00s	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 			1:56:56	-	IMT	1910 Oct # Istanbul Mean Time?
 			2:00	Turkey	EE%sT	1978 Jun 29
 			3:00	Turkey	+03/+04	1984 Nov  1  2:00
 			2:00	Turkey	EE%sT	2007
 			2:00	EU	EE%sT	2011 Mar 27  1:00u
 			2:00	-	EET	2011 Mar 28  1:00u
 			2:00	EU	EE%sT	2014 Mar 30  1:00u
 			2:00	-	EET	2014 Mar 31  1:00u
 			2:00	EU	EE%sT	2015 Oct 25  1:00u
 			2:00	1:00	EEST	2015 Nov  8  1:00u
 			2:00	EU	EE%sT	2016 Sep  7
 			3:00	-	+03
 
 # Ukraine
 #
 # From Alois Treindl (2014-03-01):
 # REGULATION A N O V A on March 20, 1992 N 139 ...  means that from
 # 1992 on, Ukraine had DST with begin time at 02:00 am, on last Sunday
 # in March, and end time 03:00 am, last Sunday in September....
 # CABINET OF MINISTERS OF UKRAINE RESOLUTION on May 13, 1996 N 509
 # "On the order of computation time on the territory of Ukraine" ....
 # As this cabinet decision is from May 1996, it seems likely that the
 # transition in March 1996, which predates it, was still at 2:00 am
 # and not at 3:00 as would have been under EU rules.
 # This is why I have set the change to EU rules into May 1996,
 # so that the change in March is stil covered by the Ukraine rule.
 # The next change in October 1996 happened under EU rules....
 # TZ database holds three other zones for Ukraine.... I have not yet
 # worked out the consequences for these three zones, as we (me and my
 # US colleague David Cochrane) are still trying to get more
 # information upon these local deviations from Kiev rules.
 #
 # From Paul Eggert (2022-08-27):
 # For now, assume that Ukraine's zones all followed the same rules,
 # except that Crimea switched to Moscow time in 1994 as described elsewhere.
 
 # From Igor Karpov, who works for the Ukrainian Ministry of Justice,
 # via Garrett Wollman (2003-01-27):
 # BTW, I've found the official document on this matter. It's government
 # regulations No. 509, May 13, 1996. In my poor translation it says:
 # "Time in Ukraine is set to second timezone (Kiev time). Each last Sunday
 # of March at 3am the time is changing to 4am and each last Sunday of
 # October the time at 4am is changing to 3am"
 
 # From Alexander Krivenyshev (2011-09-20):
 # On September 20, 2011 the deputies of the Verkhovna Rada agreed to
 # abolish the transfer clock to winter time.
 #
 # Bill No. 8330 of MP from the Party of Regions Oleg Nadoshi got
 # approval from 266 deputies.
 #
 # Ukraine abolishes transfer back to the winter time (in Russian)
 # http://news.mail.ru/politics/6861560/
 #
 # The Ukrainians will no longer change the clock (in Russian)
 # http://www.segodnya.ua/news/14290482.html
 #
 # Deputies cancelled the winter time (in Russian)
 # https://www.pravda.com.ua/rus/news/2011/09/20/6600616/
 #
 # From Philip Pizzey (2011-10-18):
 # Today my Ukrainian colleagues have informed me that the
 # Ukrainian parliament have decided that they will go to winter
 # time this year after all.
 #
 # From Udo Schwedt (2011-10-18):
 # As far as I understand, the recent change to the Ukrainian time zone
 # (Europe/Kiev) to introduce permanent daylight saving time (similar
 # to Russia) was reverted today:
 # http://portal.rada.gov.ua/rada/control/en/publish/article/info_left?art_id=287324&cat_id=105995
 #
 # Also reported by Alexander Bokovoy (2011-10-18) who also noted:
 # The law documents themselves are at
 # http://w1.c1.rada.gov.ua/pls/zweb_n/webproc4_1?id=&pf3511=41484
 
 # From Vladimir in Moscow via Alois Treindl re Kyiv time 1991/2 (2014-02-28):
 # First in Ukraine they changed Time zone from UTC+3 to UTC+2 with DST:
 #       03 25 1990 02:00 -03.00 1       Time Zone 3 with DST
 #       07 01 1990 02:00 -02.00 1       Time Zone 2 with DST
 # * Ukrainian Government's Resolution of 18.06.1990, No. 134.
 # http://search.ligazakon.ua/l_doc2.nsf/link1/T001500.html
 #
 # They did not end DST in September, 1990 (according to the law,
 # "summer time" was still in action):
 #       09 30 1990 03:00 -02.00 1       Time Zone 2 with DST
 # * Ukrainian Government's Resolution of 21.09.1990, No. 272.
 # http://search.ligazakon.ua/l_doc2.nsf/link1/KP900272.html
 #
 # Again no change in March, 1991 ("summer time" in action):
 #       03 31 1991 02:00 -02.00 1       Time Zone 2 with DST
 #
 # DST ended in September 1991 ("summer time" ended):
 #       09 29 1991 03:00 -02.00 0       Time Zone 2, no DST
 # * Ukrainian Government's Resolution of 25.09.1991, No. 225.
 # http://www.uazakon.com/documents/date_21/pg_iwgdoc.htm
 # This is an answer.
 #
 # Since 1992 they had normal DST procedure:
 #       03 29 1992 02:00 -02.00 1       DST started
 #       09 27 1992 03:00 -02.00 0       DST ended
 # * Ukrainian Government's Resolution of 20.03.1992, No. 139.
 # http://www.uazakon.com/documents/date_8u/pg_grcasa.htm
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Kyiv	2:02:04 -	LMT	1880
 			2:02:04	-	KMT	1924 May  2 # Kyiv Mean Time
 			2:00	-	EET	1930 Jun 21
 			3:00	-	MSK	1941 Sep 20
 			1:00	C-Eur	CE%sT	1943 Nov  6
 			3:00	Russia	MSK/MSD	1990 Jul  1  2:00
 			2:00	1:00	EEST	1991 Sep 29  3:00
 			2:00	C-Eur	EE%sT	1996 May 13
 			2:00	EU	EE%sT
 
 ###############################################################################
 
 # One source shows that Bulgaria, Cyprus, Finland, and Greece observe DST from
 # the last Sunday in March to the last Sunday in September in 1986.
 # The source shows Romania changing a day later than everybody else.
 #
 # According to Bernard Sieloff's source, Poland is in the MET time zone but
 # uses the WE DST rules.  The Western USSR uses EET+1 and ME DST rules.
 # Bernard Sieloff's source claims Romania switches on the same day, but at
 # 00:00 standard time (i.e., 01:00 DST).  It also claims that Turkey
 # switches on the same day, but switches on at 01:00 standard time
 # and off at 00:00 standard time (i.e., 01:00 DST)
 
 # ...
 # Date: Wed, 28 Jan 87 16:56:27 -0100
 # From: Tom Hofmann
 # ...
 #
 # ...the European time rules are...standardized since 1981, when
 # most European countries started DST.  Before that year, only
 # a few countries (UK, France, Italy) had DST, each according
 # to own national rules.  In 1981, however, DST started on
 # 'Apr firstSun', and not on 'Mar lastSun' as in the following
 # years...
 # But also since 1981 there are some more national exceptions
 # than listed in 'europe': Switzerland, for example, joined DST
 # one year later, Denmark ended DST on 'Oct 1' instead of 'Sep
 # lastSun' in 1981 - I don't know how they handle now.
 #
 # Finally, DST ist always from 'Apr 1' to 'Oct 1' in the
 # Soviet Union (as far as I know).
 #
 # Tom Hofmann, Scientific Computer Center, CIBA-GEIGY AG,
 # 4002 Basle, Switzerland
 # ...
 
 # ...
 # Date: Wed, 4 Feb 87 22:35:22 +0100
 # From: Dik T. Winter
 # ...
 #
 # The information from Tom Hofmann is (as far as I know) not entirely correct.
 # After a request from chongo at amdahl I tried to retrieve all information
 # about DST in Europe.  I was able to find all from about 1969.
 #
 # ...standardization on DST in Europe started in about 1977 with switches on
 # first Sunday in April and last Sunday in September...
 # In 1981 UK joined Europe insofar that
 # the starting day for both shifted to last Sunday in March.  And from 1982
 # the whole of Europe used DST, with switch dates April 1 and October 1 in
 # the Sov[i]et Union.  In 1985 the SU reverted to standard Europe[a]n switch
 # dates...
 #
 # It should also be remembered that time-zones are not constants; e.g.
 # Portugal switched in 1976 from MET (or CET) to WET with DST...
 # Note also that though there were rules for switch dates not
 # all countries abided to these dates, and many individual deviations
 # occurred, though not since 1982 I believe.  Another note: it is always
 # assumed that DST is 1 hour ahead of normal time, this need not be the
 # case; at least in the Netherlands there have been times when DST was 2 hours
 # in advance of normal time.
 #
 # ...
 # dik t. winter, cwi, amsterdam, nederland
 # ...
 
 # From Bob Devine (1988-01-28):
 # ...
 # Greece: Last Sunday in April to last Sunday in September (iffy on dates).
 # Since 1978.  Change at midnight.
 # ...
 # Monaco: has same DST as France.
 # ...
diff --git a/iso3166.tab b/iso3166.tab
index a4ff61a4d321..911af5e837e2 100644
--- a/iso3166.tab
+++ b/iso3166.tab
@@ -1,274 +1,274 @@
 # ISO 3166 alpha-2 country codes
 #
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 #
-# From Paul Eggert (2015-05-02):
+# From Paul Eggert (2022-11-18):
 # This file contains a table of two-letter country codes.  Columns are
 # separated by a single tab.  Lines beginning with '#' are comments.
 # All text uses UTF-8 encoding.  The columns of the table are as follows:
 #
 # 1.  ISO 3166-1 alpha-2 country code, current as of
-#     ISO 3166-1 N976 (2018-11-06).  See: Updates on ISO 3166-1
+#     ISO 3166-1 N1087 (2022-09-02).  See: Updates on ISO 3166-1
 #     https://isotc.iso.org/livelink/livelink/Open/16944257
 # 2.  The usual English name for the coded region,
 #     chosen so that alphabetic sorting of subsets produces helpful lists.
 #     This is not the same as the English name in the ISO 3166 tables.
 #
 # The table is sorted by country code.
 #
 # This table is intended as an aid for users, to help them select time
 # zone data appropriate for their practical needs.  It is not intended
 # to take or endorse any position on legal or territorial claims.
 #
 #country-
 #code	name of country, territory, area, or subdivision
 AD	Andorra
 AE	United Arab Emirates
 AF	Afghanistan
 AG	Antigua & Barbuda
 AI	Anguilla
 AL	Albania
 AM	Armenia
 AO	Angola
 AQ	Antarctica
 AR	Argentina
 AS	Samoa (American)
 AT	Austria
 AU	Australia
 AW	Aruba
 AX	Åland Islands
 AZ	Azerbaijan
 BA	Bosnia & Herzegovina
 BB	Barbados
 BD	Bangladesh
 BE	Belgium
 BF	Burkina Faso
 BG	Bulgaria
 BH	Bahrain
 BI	Burundi
 BJ	Benin
 BL	St Barthelemy
 BM	Bermuda
 BN	Brunei
 BO	Bolivia
 BQ	Caribbean NL
 BR	Brazil
 BS	Bahamas
 BT	Bhutan
 BV	Bouvet Island
 BW	Botswana
 BY	Belarus
 BZ	Belize
 CA	Canada
 CC	Cocos (Keeling) Islands
 CD	Congo (Dem. Rep.)
 CF	Central African Rep.
 CG	Congo (Rep.)
 CH	Switzerland
 CI	Côte d'Ivoire
 CK	Cook Islands
 CL	Chile
 CM	Cameroon
 CN	China
 CO	Colombia
 CR	Costa Rica
 CU	Cuba
 CV	Cape Verde
 CW	Curaçao
 CX	Christmas Island
 CY	Cyprus
 CZ	Czech Republic
 DE	Germany
 DJ	Djibouti
 DK	Denmark
 DM	Dominica
 DO	Dominican Republic
 DZ	Algeria
 EC	Ecuador
 EE	Estonia
 EG	Egypt
 EH	Western Sahara
 ER	Eritrea
 ES	Spain
 ET	Ethiopia
 FI	Finland
 FJ	Fiji
 FK	Falkland Islands
 FM	Micronesia
 FO	Faroe Islands
 FR	France
 GA	Gabon
 GB	Britain (UK)
 GD	Grenada
 GE	Georgia
 GF	French Guiana
 GG	Guernsey
 GH	Ghana
 GI	Gibraltar
 GL	Greenland
 GM	Gambia
 GN	Guinea
 GP	Guadeloupe
 GQ	Equatorial Guinea
 GR	Greece
 GS	South Georgia & the South Sandwich Islands
 GT	Guatemala
 GU	Guam
 GW	Guinea-Bissau
 GY	Guyana
 HK	Hong Kong
 HM	Heard Island & McDonald Islands
 HN	Honduras
 HR	Croatia
 HT	Haiti
 HU	Hungary
 ID	Indonesia
 IE	Ireland
 IL	Israel
 IM	Isle of Man
 IN	India
 IO	British Indian Ocean Territory
 IQ	Iraq
 IR	Iran
 IS	Iceland
 IT	Italy
 JE	Jersey
 JM	Jamaica
 JO	Jordan
 JP	Japan
 KE	Kenya
 KG	Kyrgyzstan
 KH	Cambodia
 KI	Kiribati
 KM	Comoros
 KN	St Kitts & Nevis
 KP	Korea (North)
 KR	Korea (South)
 KW	Kuwait
 KY	Cayman Islands
 KZ	Kazakhstan
 LA	Laos
 LB	Lebanon
 LC	St Lucia
 LI	Liechtenstein
 LK	Sri Lanka
 LR	Liberia
 LS	Lesotho
 LT	Lithuania
 LU	Luxembourg
 LV	Latvia
 LY	Libya
 MA	Morocco
 MC	Monaco
 MD	Moldova
 ME	Montenegro
 MF	St Martin (French)
 MG	Madagascar
 MH	Marshall Islands
 MK	North Macedonia
 ML	Mali
 MM	Myanmar (Burma)
 MN	Mongolia
 MO	Macau
 MP	Northern Mariana Islands
 MQ	Martinique
 MR	Mauritania
 MS	Montserrat
 MT	Malta
 MU	Mauritius
 MV	Maldives
 MW	Malawi
 MX	Mexico
 MY	Malaysia
 MZ	Mozambique
 NA	Namibia
 NC	New Caledonia
 NE	Niger
 NF	Norfolk Island
 NG	Nigeria
 NI	Nicaragua
 NL	Netherlands
 NO	Norway
 NP	Nepal
 NR	Nauru
 NU	Niue
 NZ	New Zealand
 OM	Oman
 PA	Panama
 PE	Peru
 PF	French Polynesia
 PG	Papua New Guinea
 PH	Philippines
 PK	Pakistan
 PL	Poland
 PM	St Pierre & Miquelon
 PN	Pitcairn
 PR	Puerto Rico
 PS	Palestine
 PT	Portugal
 PW	Palau
 PY	Paraguay
 QA	Qatar
 RE	Réunion
 RO	Romania
 RS	Serbia
 RU	Russia
 RW	Rwanda
 SA	Saudi Arabia
 SB	Solomon Islands
 SC	Seychelles
 SD	Sudan
 SE	Sweden
 SG	Singapore
 SH	St Helena
 SI	Slovenia
 SJ	Svalbard & Jan Mayen
 SK	Slovakia
 SL	Sierra Leone
 SM	San Marino
 SN	Senegal
 SO	Somalia
 SR	Suriname
 SS	South Sudan
 ST	Sao Tome & Principe
 SV	El Salvador
 SX	St Maarten (Dutch)
 SY	Syria
 SZ	Eswatini (Swaziland)
 TC	Turks & Caicos Is
 TD	Chad
-TF	French Southern & Antarctic Lands
+TF	French Southern Territories
 TG	Togo
 TH	Thailand
 TJ	Tajikistan
 TK	Tokelau
 TL	East Timor
 TM	Turkmenistan
 TN	Tunisia
 TO	Tonga
 TR	Turkey
 TT	Trinidad & Tobago
 TV	Tuvalu
 TW	Taiwan
 TZ	Tanzania
 UA	Ukraine
 UG	Uganda
 UM	US minor outlying islands
 US	United States
 UY	Uruguay
 UZ	Uzbekistan
 VA	Vatican City
 VC	St Vincent
 VE	Venezuela
 VG	Virgin Islands (UK)
 VI	Virgin Islands (US)
 VN	Vietnam
 VU	Vanuatu
 WF	Wallis & Futuna
 WS	Samoa (western)
 YE	Yemen
 YT	Mayotte
 ZA	South Africa
 ZM	Zambia
 ZW	Zimbabwe
diff --git a/northamerica b/northamerica
index df1954359cce..d50581d00774 100644
--- a/northamerica
+++ b/northamerica
@@ -1,3596 +1,3619 @@
 # tzdb data for North and Central America and environs
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # also includes Central America and the Caribbean
 
 # This file is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
 # From Paul Eggert (1999-03-22):
 # A reliable and entertaining source about time zones is
 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
 
 ###############################################################################
 
 # United States
 
 # From Paul Eggert (1999-03-31):
 # Howse writes (pp 121-125) that time zones were invented by
 # Professor Charles Ferdinand Dowd (1825-1904),
 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
 # His pamphlet "A System of National Time for Railroads" (1870)
 # was the result of his proposals at the Convention of Railroad Trunk Lines
 # in New York City (1869-10).  His 1870 proposal was based on Washington, DC,
 # but in 1872-05 he moved the proposed origin to Greenwich.
 
 # From Paul Eggert (2018-03-20):
 # Dowd's proposal left many details unresolved, such as where to draw
 # lines between time zones.  The key individual who made time zones
 # work in the US was William Frederick Allen - railway engineer,
 # managing editor of the Travelers' Guide, and secretary of the
 # General Time Convention, a railway standardization group.  Allen
 # spent months in dialogs with scientific and railway leaders,
 # developed a workable plan to institute time zones, and presented it
 # to the General Time Convention on 1883-04-11, saying that his plan
 # meant "local time would be practically abolished" - a plus for
 # railway scheduling.  By the next convention on 1883-10-11 nearly all
 # railroads had agreed and it took effect on 1883-11-18.  That Sunday
 # was called the "day of two noons", as some locations observed noon
 # twice.  Allen witnessed the transition in New York City, writing:
 #
 #   I heard the bells of St. Paul's strike on the old time.  Four
 #   minutes later, obedient to the electrical signal from the Naval
 #   Observatory ... the time-ball made its rapid descent, the chimes
 #   of old Trinity rang twelve measured strokes, and local time was
 #   abandoned, probably forever.
 #
 # Most of the US soon followed suit.  See:
 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
 # https://dx.doi.org/10.2307/3105430
 
 # From Paul Eggert (2005-04-16):
 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
 
 # From Paul Eggert (2006-03-22):
 # A good source for time zone historical data in the US is
 # Thomas G. Shanks, The American Atlas (5th edition),
 # San Diego: ACS Publications, Inc. (1991).
 # Make sure you have the errata sheet; the book is somewhat useless without it.
 # It is the source for most of the pre-1991 US entries below.
 
 # From Paul Eggert (2001-03-06):
 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
 # in his whimsical essay "An Economical Project for Diminishing the Cost
 # of Light" published in the Journal de Paris (1784-04-26).
 # Not everyone is happy with the results:
 #
 #	I don't really care how time is reckoned so long as there is some
 #	agreement about it, but I object to being told that I am saving
 #	daylight when my reason tells me that I am doing nothing of the kind.
 #	I even object to the implication that I am wasting something
 #	valuable if I stay in bed after the sun has risen.  As an admirer
 #	of moonlight I resent the bossy insistence of those who want to
 #	reduce my time for enjoying it.  At the back of the Daylight Saving
 #	scheme I detect the bony, blue-fingered hand of Puritanism, eager
 #	to push people into bed earlier, and get them up earlier, to make
 #	them healthy, wealthy and wise in spite of themselves.
 #
 #	 -- Robertson Davies, The diary of Samuel Marchbanks,
 #	   Clarke, Irwin (1947), XIX, Sunday
 #
 # For more about the first ten years of DST in the United States, see
 # Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
 # (Carnegie Library of Pittsburgh, 1927).
 # https://web.archive.org/web/20160517155308/http://www.clpgh.org/exhibit/dst.html
 #
 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
 # However, DST was imposed by the Standard Time Act of 1918, which
 # was the first nationwide legal time standard, and apparently
 # time was just called "Standard Time" or "Daylight Saving Time".
 
 # From Paul Eggert (2019-06-04):
 # Here is the legal basis for the US federal rules.
 # * Public Law 65-106 (1918-03-19) implemented standard and daylight saving
 #   time for the first time across the US, springing forward on March's last
 #   Sunday and falling back on October's last Sunday.
 #   https://www.loc.gov/law/help/statutes-at-large/65th-congress/session-2/c65s2ch24.pdf
 # * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday.
 #   https://www.loc.gov/law/help/statutes-at-large/66th-congress/session-1/c66s1ch51.pdf
 # * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09.
 #   https://www.loc.gov/law/help/statutes-at-large/77th-congress/session-2/c77s2ch7.pdf
 # * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30.
 #   https://www.loc.gov/law/help/statutes-at-large/79th-congress/session-1/c79s1ch388.pdf
 # * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST,
 #   from April's last Sunday to October's last Sunday, effective 1967.
 #   https://www.govinfo.gov/content/pkg/STATUTE-80/pdf/STATUTE-80-Pg107.pdf
 # * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06.
 #   https://www.govinfo.gov/content/pkg/STATUTE-87/pdf/STATUTE-87-Pg707.pdf
 # * Public Law 93-434 (1974-10-05) moved the 1975 spring-forward to
 #   February's last Sunday.
 #   https://www.govinfo.gov/content/pkg/STATUTE-88/pdf/STATUTE-88-Pg1209.pdf
 # * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first
 #   Sunday.
 #   https://www.govinfo.gov/content/pkg/STATUTE-100/pdf/STATUTE-100-Pg764.pdf
 # * Public Law 109-58 (2005-08-08), effective 2007, moved the spring-forward
 #   to March's second Sunday and the fall-back to November's first Sunday.
 #   https://www.govinfo.gov/content/pkg/PLAW-109publ58/pdf/PLAW-109publ58.pdf
 # All transitions are at 02:00 local time.
 
 # From Arthur David Olson:
 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
 # Daylight Saving Time in the US was by local option, except during wartime.
 
 # From Arthur David Olson (2000-09-25):
 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
 # In the introduction, Oboler spoke of "Eastern Peace Time."
 # An AltaVista search turned up:
 # https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html
 # "When the time is announced over the radio now, it is 'Eastern Peace
 # Time' instead of the old familiar 'Eastern War Time.'  Peace is wonderful."
 # (August 1945) by way of confirmation.
 #
 # From Paul Eggert (2017-09-23):
 # This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter.
 
 # From Joseph Gallant citing
 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
 # to switch to London for Attlee's address, but the American people
 # never got to hear his speech live. According to one press account,
 # CBS' Bob Trout was first to announce the word of Japan's surrender,
 # but a few seconds later, NBC, ABC and Mutual also flashed the word
 # of surrender, all of whom interrupting the bells of Big Ben in
 # London which were to precede Mr. Attlee's speech.
 
 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout.  From
 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
 #
 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
 # Any announcement from Asia would reach St. John's New York newsroom on a
 # wire service teletype machine, which had prescribed signals for major news.
 # Associated Press, for example, would ring five bells before spewing out
 # typed copy of an important story, and 10 bells for news "of transcendental
 # importance."
 #
 # On Aug. 14, stalling while talking steadily into the NBC networks' open
 # microphone, St. John heard five bells and waited only to hear a sixth bell,
 # before announcing confidently: "Ladies and gentlemen, World War II is over.
 # The Japanese have agreed to our surrender terms."
 #
 # He had scored a 20-second scoop on other broadcasters.
 
 # From Arthur David Olson (2005-08-22):
 # Paul has been careful to use the "US" rules only in those locations
 # that are part of the United States; this reflects the real scope of
 # U.S. government action.  So even though the "US" rules have changed
 # in the latest release, other countries won't be affected.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	US	1918	1919	-	Mar	lastSun	2:00	1:00	D
 Rule	US	1918	1919	-	Oct	lastSun	2:00	0	S
 Rule	US	1942	only	-	Feb	9	2:00	1:00	W # War
 Rule	US	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	US	1945	only	-	Sep	30	2:00	0	S
 Rule	US	1967	2006	-	Oct	lastSun	2:00	0	S
 Rule	US	1967	1973	-	Apr	lastSun	2:00	1:00	D
 Rule	US	1974	only	-	Jan	6	2:00	1:00	D
 Rule	US	1975	only	-	Feb	lastSun	2:00	1:00	D
 Rule	US	1976	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	US	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
 Rule	US	2007	max	-	Mar	Sun>=8	2:00	1:00	D
 Rule	US	2007	max	-	Nov	Sun>=1	2:00	0	S
 
 # From Arthur David Olson, 2005-12-19
 # We generate the files specified below to guard against old files with
 # obsolete information being left in the time zone binary directory.
 # We limit the list to names that have appeared in previous versions of
 # this time zone package.
 # We do these as separate Zones rather than as Links to avoid problems if
 # a particular place changes whether it observes DST.
 # We put these specifications here in the northamerica file both to
 # increase the chances that they'll actually get compiled and to
 # avoid the need to duplicate the US rules in another file.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	EST		 -5:00	-	EST
 Zone	MST		 -7:00	-	MST
 Zone	HST		-10:00	-	HST
 Zone	EST5EDT		 -5:00	US	E%sT
 Zone	CST6CDT		 -6:00	US	C%sT
 Zone	MST7MDT		 -7:00	US	M%sT
 Zone	PST8PDT		 -8:00	US	P%sT
 
 # From U. S. Naval Observatory (1989-01-19):
 # USA  EASTERN       5 H  BEHIND UTC    NEW YORK, WASHINGTON
 # USA  EASTERN       4 H  BEHIND UTC    APR 3 - OCT 30
 # USA  CENTRAL       6 H  BEHIND UTC    CHICAGO, HOUSTON
 # USA  CENTRAL       5 H  BEHIND UTC    APR 3 - OCT 30
 # USA  MOUNTAIN      7 H  BEHIND UTC    DENVER
 # USA  MOUNTAIN      6 H  BEHIND UTC    APR 3 - OCT 30
 # USA  PACIFIC       8 H  BEHIND UTC    L.A., SAN FRANCISCO
 # USA  PACIFIC       7 H  BEHIND UTC    APR 3 - OCT 30
 # USA  ALASKA STD    9 H  BEHIND UTC    MOST OF ALASKA     (AKST)
 # USA  ALASKA STD    8 H  BEHIND UTC    APR 3 - OCT 30 (AKDT)
 # USA  ALEUTIAN     10 H  BEHIND UTC    ISLANDS WEST OF 170W
 # USA    "           9 H  BEHIND UTC    APR 3 - OCT 30
 # USA  HAWAII       10 H  BEHIND UTC
 # USA  BERING       11 H  BEHIND UTC    SAMOA, MIDWAY
 
 # From Arthur David Olson (1989-01-21):
 # The above dates are for 1988.
 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
 # no DST in Samoa, and the claim that there is DST in Alaska and the
 # Aleutians.
 
 # From Arthur David Olson (1988-02-13):
 # Legal standard time zone names, from United States Code (1982 Edition and
 # Supplement III), Title 15, Chapter 6, Section 260 and forward.  First, names
 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
 # took effect), as explained in sections 263 and 261:
 #	(none)
 #	United States standard eastern time
 #	United States standard mountain time
 #	United States standard central time
 #	United States standard Pacific time
 #	(none)
 #	United States standard Alaska time
 #	(none)
 # Next, names from 1967-04-01 until 1983-11-30 (the date for
 # public law 98-181):
 #	Atlantic standard time
 #	eastern standard time
 #	central standard time
 #	mountain standard time
 #	Pacific standard time
 #	Yukon standard time
 #	Alaska-Hawaii standard time
 #	Bering standard time
 # And after 1983-11-30:
 #	Atlantic standard time
 #	eastern standard time
 #	central standard time
 #	mountain standard time
 #	Pacific standard time
 #	Alaska standard time
 #	Hawaii-Aleutian standard time
 #	Samoa standard time
 # The law doesn't give abbreviations.
 #
 # From Paul Eggert (2016-12-19):
 # Here are URLs for the 1918 and 1966 legislation:
 # http://uscode.house.gov/statviewer.htm?volume=40&page=451
 # http://uscode.house.gov/statviewer.htm?volume=80&page=108
 # Although the 1918 names were officially "United States Standard
 # Eastern Time" and similarly for "Central", "Mountain", "Pacific",
 # and "Alaska", in practice "Standard" was placed just before "Time",
 # as codified in 1966.  In practice, Alaska time was abbreviated "AST"
 # before 1968.  Summarizing the 1967 name changes:
 #	1918 names			1967 names
 #  -08	Standard Pacific Time (PST)	Pacific standard time (PST)
 #  -09	(unofficial) Yukon (YST)	Yukon standard time (YST)
 #  -10	Standard Alaska Time (AST)	Alaska-Hawaii standard time (AHST)
 #  -11	(unofficial) Nome (NST)		Bering standard time (BST)
 #
 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
 # for time in Guam and the Northern Marianas.  See the file "australasia".
 #
 # From Paul Eggert (2015-04-17):
 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
 # standard and daylight times.  See section 9.47 (p 234) of the
 # U.S. Government Printing Office Style Manual (2008)
 # https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
 
 # From Arthur David Olson, 2005-08-09
 # The following was signed into law on 2005-08-08.
 #
 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
 #   (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
 #   U.S.C. 260a(a)) is amended--
 #     (1) by striking "first Sunday of April" and inserting "second
 #     Sunday of March"; and
 #     (2) by striking "last Sunday of October" and inserting "first
 #     Sunday of November'.
 #   (b) Effective Date.--Subsection (a) shall take effect 1 year after the
 #   date of enactment of this Act or March 1, 2007, whichever is later.
 #   (c) Report to Congress.--Not later than 9 months after the effective
 #   date stated in subsection (b), the Secretary shall report to Congress
 #   on the impact of this section on energy consumption in the United
 #   States.
 #   (d) Right to Revert.--Congress retains the right to revert the
 #   Daylight Saving Time back to the 2005 time schedules once the
 #   Department study is complete.
 
 # US eastern time, represented by New York
 
 # Connecticut, Delaware, District of Columbia, most of Florida,
 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
 # Vermont, Virginia, West Virginia
 
 # From Dave Cantor (2004-11-02):
 # Early this summer I had the occasion to visit the Mount Washington
 # Observatory weather station atop (of course!) Mount Washington [, NH]....
 # One of the staff members said that the station was on Eastern Standard Time
 # and didn't change their clocks for Daylight Saving ... so that their
 # reports will always have times which are 5 hours behind UTC.
 
 # From Paul Eggert (2005-08-26):
 # According to today's Huntsville Times
 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
 # in Russell County, Lanett in Chambers County and some towns in Lee County,
 # set their watches and clocks on Eastern time."  It quotes H.H. "Bubba"
 # Roberts, city administrator in Phenix City. as saying "We are in the Central
 # time zone, but we do go by the Eastern time zone because so many people work
 # in Columbus."
 #
 # From Paul Eggert (2017-02-22):
 # Four cities are involved.  The two not mentioned above are Smiths Station
 # and Valley.  Barbara Brooks, Valley's assistant treasurer, heard it started
 # because West Point Pepperell textile mills were in Alabama while the
 # corporate office was in Georgia, and residents voted to keep Eastern
 # time even after the mills closed.  See: Kazek K. Did you know which
 # Alabama towns are in a different time zone?  al.com 2017-02-06.
 # http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html
 
 # From Paul Eggert (2014-09-06):
 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
 # says that New York City Hall time was 3 minutes 58.4 seconds fast of
 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	NYC	1920	only	-	Mar	lastSun	2:00	1:00	D
 Rule	NYC	1920	only	-	Oct	lastSun	2:00	0	S
 Rule	NYC	1921	1966	-	Apr	lastSun	2:00	1:00	D
 Rule	NYC	1921	1954	-	Sep	lastSun	2:00	0	S
 Rule	NYC	1955	1966	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-4:56:01.6
 Zone America/New_York	-4:56:02 -	LMT	1883 Nov 18 17:00u
 			-5:00	US	E%sT	1920
 			-5:00	NYC	E%sT	1942
 			-5:00	US	E%sT	1946
 			-5:00	NYC	E%sT	1967
 			-5:00	US	E%sT
 
 # US central time, represented by Chicago
 
 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
 # Washington counties), Illinois, western Indiana
 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
 # western Tennessee, most of Texas, Wisconsin
 
 # From Paul Eggert (2018-01-07):
 # In 1869 the Chicago Astronomical Society contracted with the city to keep
 # time.  Though delayed by the Great Fire, by 1880 a wire ran from the
 # Dearborn Observatory (on the University of Chicago campus) to City Hall,
 # which then sent signals to police and fire stations.  However, railroads got
 # their time signals from the Allegheny Observatory, the Madison Observatory,
 # the Ann Arbor Observatory, etc., so their clocks did not agree with each
 # other or with the city's official time.  The confusion took some years to
 # clear up.  See:
 # Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04.
 # http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/
 
 # From Larry M. Smith (2006-04-26) re Wisconsin:
 # https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf
 # is currently enforced at the 01:00 time of change.  Because the local
 # "bar time" in the state corresponds to 02:00, a number of citations
 # are issued for the "sale of class 'B' alcohol after prohibited
 # hours" within the deviated hour of this change every year....
 #
 # From Douglas R. Bomberg (2007-03-12):
 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
 # Statue 175 closer in synch with the US Congress' intent....
 # https://docs.legis.wisconsin.gov/2007/related/acts/3
 
 # From an email administrator of the City of Fort Pierre, SD (2015-12-21):
 # Fort Pierre is technically located in the Mountain time zone as is
 # the rest of Stanley County.  Most of Stanley County and Fort Pierre
 # uses the Central time zone due to doing most of their business in
 # Pierre so it simplifies schedules.  I have lived in Stanley County
 # all my life and it has been that way since I can remember.  (43 years!)
 #
 # From Paul Eggert (2015-12-25):
 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
 
 # From Paul Eggert (2015-04-06):
 # In 1950s Nashville a public clock had dueling faces, one for conservatives
 # and the other for liberals; the two sides didn't agree about the time of day.
 # I haven't found a photo of this clock, nor have I tracked down the TIME
 # magazine report cited below, but here's the story as told by the late
 # American journalist John Seigenthaler, who was there:
 #
 # "The two [newspaper] owners held strongly contrasting political and
 # ideological views.  Evans was a New South liberal, Stahlman an Old South
 # conservative, and their two papers frequently clashed editorially, often on
 # the same day....  In the 1950s as the state legislature was grappling with
 # the question of whether to approve daylight saving time for the entire state,
 # TIME magazine reported:
 #
 # "'The Nashville Banner and The Nashville Tennessean rarely agree on anything
 # but the time of day - and last week they couldn't agree on that.'
 #
 # "It was all too true. The clock on the front of the building had two faces -
 # The Tennessean side of the building facing west, the other, east.  When it
 # was high noon Banner time, it was 11 a.m. Tennessean time."
 #
 # Seigenthaler J. For 100 years, Tennessean had it covered.
 # The Tennessean 2007-05-11, republished 2015-04-06.
 # https://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenthaler-for-100-years-the-tennessean-had-it-covered/25348545/
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Chicago	1920	only	-	Jun	13	2:00	1:00	D
 Rule	Chicago	1920	1921	-	Oct	lastSun	2:00	0	S
 Rule	Chicago	1921	only	-	Mar	lastSun	2:00	1:00	D
 Rule	Chicago	1922	1966	-	Apr	lastSun	2:00	1:00	D
 Rule	Chicago	1922	1954	-	Sep	lastSun	2:00	0	S
 Rule	Chicago	1955	1966	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Chicago	-5:50:36 -	LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1920
 			-6:00	Chicago	C%sT	1936 Mar  1  2:00
 			-5:00	-	EST	1936 Nov 15  2:00
 			-6:00	Chicago	C%sT	1942
 			-6:00	US	C%sT	1946
 			-6:00	Chicago	C%sT	1967
 			-6:00	US	C%sT
 # Oliver County, ND switched from mountain to central time on 1992-10-25.
 Zone America/North_Dakota/Center -6:45:12 - LMT	1883 Nov 18 19:00u
 			-7:00	US	M%sT	1992 Oct 25  2:00
 			-6:00	US	C%sT
 # Morton County, ND, switched from mountain to central time on
 # 2003-10-26, except for the area around Mandan which was already central time.
 # See .
 # Officially this switch also included part of Sioux County, and
 # Jones, Mellette, and Todd Counties in South Dakota;
 # but in practice these other counties were already observing central time.
 # See .
 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 19:00u
 			-7:00	US	M%sT	2003 Oct 26  2:00
 			-6:00	US	C%sT
 
 # From Josh Findley (2011-01-21):
 # ...it appears that Mercer County, North Dakota, changed from the
 # mountain time zone to the central time zone at the last transition from
 # daylight-saving to standard time (on Nov. 7, 2010):
 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
 
 # From Andy Lipscomb (2011-01-24):
 # ...according to the Census Bureau, the largest city is Beulah (although
 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
 # largest city in Mercer County).  Google Maps places Beulah's city hall
 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
 
 Zone America/North_Dakota/Beulah -6:47:07 - LMT	1883 Nov 18 19:00u
 			-7:00	US	M%sT	2010 Nov  7  2:00
 			-6:00	US	C%sT
 
 # US mountain time, represented by Denver
 #
 # Colorado, far western Kansas, Montana, western
 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
 # New Mexico, southwestern North Dakota,
 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
 #
 # From Paul Eggert (2018-10-25):
 # On 1921-03-04 federal law placed all of Texas into the central time zone.
 # However, El Paso ignored the law for decades and continued to observe
 # mountain time, on the grounds that that's what they had always done
 # and they weren't about to let the federal government tell them what to do.
 # Eventually the federal government gave in and changed the law on
 # 1970-04-10 to match what El Paso was actually doing.  Although
 # that's slightly after our 1970 cutoff, there is no need to create a
 # separate zone for El Paso since they were ignoring the law anyway.  See:
 # Long T. El Pasoans were time rebels, fought to stay in Mountain zone.
 # El Paso Times. 2018-10-24 06:40 -06.
 # https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Denver	1920	1921	-	Mar	lastSun	2:00	1:00	D
 Rule	Denver	1920	only	-	Oct	lastSun	2:00	0	S
 Rule	Denver	1921	only	-	May	22	2:00	0	S
 Rule	Denver	1965	1966	-	Apr	lastSun	2:00	1:00	D
 Rule	Denver	1965	1966	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Denver	-6:59:56 -	LMT	1883 Nov 18 19:00u
 			-7:00	US	M%sT	1920
 			-7:00	Denver	M%sT	1942
 			-7:00	US	M%sT	1946
 			-7:00	Denver	M%sT	1967
 			-7:00	US	M%sT
 
 # US Pacific time, represented by Los Angeles
 #
 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
 # north of the Salmon River, and the towns of Burgdorf and Warren),
 # Nevada (except West Wendover), Oregon (except the northern ¾ of
 # Malheur county), and Washington
 
 # From Paul Eggert (2016-08-20):
 # In early February 1948, in response to California's electricity shortage,
 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
 # causing electric clocks to lose six minutes per day.  (This did not change
 # legal time, and is not part of the data here.)  See:
 # Ross SA. An energy crisis from the past: Northern California in 1948.
 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
 # 1973-11.  https://escholarship.org/uc/item/8x22k30c
 #
 # In another measure to save electricity, DST was instituted from 1948-03-14
 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
 # the fallback transition earlier.  See pages 3-4 of:
 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
 #
 # In response:
 #
 #   Governor Warren received a torrent of objecting mail, and it is not too much
 #   to speculate that the objections to Daylight Saving Time were one important
 #   factor in the defeat of the Dewey-Warren Presidential ticket in California.
 #     -- Ross, p 25
 #
 # On December 8 the governor exercised the option, setting the date to January 1
 # (LA Times 1948-12-09).  The transition time was 02:00 (LA Times 1949-01-01).
 #
 # Despite the controversy, in 1949 California voters approved Proposition 12,
 # which established DST from April's last Sunday at 01:00 until September's
 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
 # the fall-back date to October's last Sunday. See:
 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	CA	1948	only	-	Mar	14	2:01	1:00	D
 Rule	CA	1949	only	-	Jan	 1	2:00	0	S
 Rule	CA	1950	1966	-	Apr	lastSun	1:00	1:00	D
 Rule	CA	1950	1961	-	Sep	lastSun	2:00	0	S
 Rule	CA	1962	1966	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Los_Angeles -7:52:58 -	LMT	1883 Nov 18 20:00u
 			-8:00	US	P%sT	1946
 			-8:00	CA	P%sT	1967
 			-8:00	US	P%sT
 
 # Alaska
 # AK%sT is the modern abbreviation for -09 per USNO.
 #
 # From Paul Eggert (2017-06-15):
 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
 # On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the
 # Russian forts and fleet at Sitka fired salutes to mark the ceremony of
 # formal transfer.  See the Sacramento Daily Union (1867-11-14), p 3, col 2.
 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1
 # Sitka workers did not change their calendars until Sunday, 1867-10-20,
 # and so celebrated two Sundays that week.  See: Ahllund T (tr Hallamaa P).
 # From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25.
 # http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf
 # Include only the time zone part of this transition, ignoring the switch
 # from Julian to Gregorian, since we can't represent the Julian calendar.
 #
 # As far as we know, of the locations mentioned below only Sitka was
 # permanently inhabited in 1867 by anyone using either calendar.
 # (Yakutat was colonized by the Russians in 1799, but the settlement was
 # destroyed in 1805 by a Yakutat-kon war party.)  Many of Alaska's inhabitants
 # were unaware of the US acquisition of Alaska, much less of any calendar or
 # time change.  However, the Russian-influenced part of Alaska did observe
 # Russian time, and it is more accurate to model this than to ignore it.
 # The database format requires an exact transition time; use the Russian
 # salute as a somewhat-arbitrary time for the formal transfer of control for
 # all of Alaska.  Sitka's UTC offset is -9:01:13; adjust its 15:30 to the
 # local times of other Alaskan locations so that they change simultaneously.
 
 # From Paul Eggert (2014-07-18):
 # One opinion of the early-1980s turmoil in Alaska over time zones and
 # daylight saving time appeared as graffiti on a Juneau airport wall:
 # "Welcome to Juneau.  Please turn your watch back to the 19th century."
 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
 #
 # Steve Ferguson (2011-01-31) referred to the following source:
 # Norris F. Keeping time in Alaska: national directives, local response.
 # Alaska History 2001;16(1-2).
 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
 
 # From Arthur David Olson (2011-02-01):
 # Here's database-relevant material from the 2001 "Alaska History" article:
 #
 # On September 20 [1979]...DOT...officials decreed that on April 27,
 # 1980, Juneau and other nearby communities would move to Yukon Time.
 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
 # Pacific Time.
 #
 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
 # Department's September 1979 decision. Juneau and other communities in
 # northern Southeast reverted to Pacific Time on October 26.
 #
 # On October 28 [1983]...the Metlakatla Indian Community Council voted
 # unanimously to keep the reservation on Pacific Time.
 #
 # According to DOT official Joanne Petrie, Indian reservations are not
 # bound to follow time zones imposed by neighboring jurisdictions.
 #
 # (The last is consistent with how the database now handles the Navajo
 # Nation.)
 
 # From Arthur David Olson (2011-02-09):
 # I just spoke by phone with a staff member at the Metlakatla Indian
 # Community office (using contact information available at
 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
 # It's shortly after 1:00 here on the east coast of the United States;
 # the staffer said it was shortly after 10:00 there. When I asked whether
 # that meant they were on Pacific time, they said no - they were on their
 # own time. I asked about daylight saving; they said it wasn't used. I
 # did not inquire about practices in the past.
 
 # From Arthur David Olson (2011-08-17):
 # For lack of better information, assume that Metlakatla's
 # abandonment of use of daylight saving resulted from the 1983 vote.
 
 # From Steffen Thorsen (2015-11-09):
 # It seems Metlakatla did go off PST on Sunday, November 1, changing
 # their time to AKST and are going to follow Alaska's DST, switching
 # between AKST and AKDT from now on....
 # https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
 
 # From Ryan Stanley (2018-11-06):
 # The Metlakatla community in Alaska has decided not to change its
 # clock back an hour starting on November 4th, 2018 (day before yesterday).
 # They will be gmtoff=-28800 year-round.
 # https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/
 
 # From Paul Eggert (2018-12-16):
 # In a 2018-12-11 special election, Metlakatla voted to go back to
 # Alaska time (including daylight saving time) starting next year.
 # https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/
 #
 # From Ryan Stanley (2019-01-11):
 # The community will be changing back on the 20th of this month...
 # From Tim Parenti (2019-01-11):
 # Per an announcement on the Metlakatla community's official Facebook page, the
 # "fall back" will be on Sunday 2019-01-20 at 02:00:
 # https://www.facebook.com/141055983004923/photos/607150969728753/
 # So they won't be waiting for Alaska to join them on 2019-03-10, but will
 # rather change their clocks twice in seven weeks.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Juneau	 15:02:19 -	LMT	1867 Oct 19 15:33:32
 			 -8:57:41 -	LMT	1900 Aug 20 12:00
 			 -8:00	-	PST	1942
 			 -8:00	US	P%sT	1946
 			 -8:00	-	PST	1969
 			 -8:00	US	P%sT	1980 Apr 27  2:00
 			 -9:00	US	Y%sT	1980 Oct 26  2:00
 			 -8:00	US	P%sT	1983 Oct 30  2:00
 			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Sitka	 14:58:47 -	LMT	1867 Oct 19 15:30
 			 -9:01:13 -	LMT	1900 Aug 20 12:00
 			 -8:00	-	PST	1942
 			 -8:00	US	P%sT	1946
 			 -8:00	-	PST	1969
 			 -8:00	US	P%sT	1983 Oct 30  2:00
 			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Metlakatla	 15:13:42 -	LMT	1867 Oct 19 15:44:55
 			 -8:46:18 -	LMT	1900 Aug 20 12:00
 			 -8:00	-	PST	1942
 			 -8:00	US	P%sT	1946
 			 -8:00	-	PST	1969
 			 -8:00	US	P%sT	1983 Oct 30  2:00
 			 -8:00	-	PST	2015 Nov  1  2:00
 			 -9:00	US	AK%sT	2018 Nov  4  2:00
 			 -8:00	-	PST	2019 Jan 20  2:00
 			 -9:00	US	AK%sT
 Zone America/Yakutat	 14:41:05 -	LMT	1867 Oct 19 15:12:18
 			 -9:18:55 -	LMT	1900 Aug 20 12:00
 			 -9:00	-	YST	1942
 			 -9:00	US	Y%sT	1946
 			 -9:00	-	YST	1969
 			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Anchorage	 14:00:24 -	LMT	1867 Oct 19 14:31:37
 			 -9:59:36 -	LMT	1900 Aug 20 12:00
 			-10:00	-	AST	1942
 			-10:00	US	A%sT	1967 Apr
 			-10:00	-	AHST	1969
 			-10:00	US	AH%sT	1983 Oct 30  2:00
 			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Nome	 12:58:22 -	LMT	1867 Oct 19 13:29:35
 			-11:01:38 -	LMT	1900 Aug 20 12:00
 			-11:00	-	NST	1942
 			-11:00	US	N%sT	1946
 			-11:00	-	NST	1967 Apr
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30  2:00
 			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Adak	 12:13:22 -	LMT	1867 Oct 19 12:44:35
 			-11:46:38 -	LMT	1900 Aug 20 12:00
 			-11:00	-	NST	1942
 			-11:00	US	N%sT	1946
 			-11:00	-	NST	1967 Apr
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30  2:00
 			-10:00	US	AH%sT	1983 Nov 30
 			-10:00	US	H%sT
 # The following switches don't make our 1970 cutoff.
 #
 # Kiska observed Tokyo date and time during Japanese occupation from
 # 1942-06-06 to 1943-07-29, and similarly for Attu from 1942-06-07 to
 # 1943-05-29 (all dates American).  Both islands are now uninhabited.
 #
 # Shanks writes that part of southwest Alaska (e.g. Aniak)
 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
 # and another part (e.g. Akiak) made the same switch five weeks later.
 #
 # From David Flater (2004-11-09):
 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
 # Historic Preservation Commission, provided this information, which
 # suggests that Unalaska deviated from statutory time from early 1967
 # possibly until 1983:
 #
 #  Minutes of the Unalaska City Council Meeting, January 10, 1967:
 #  "Except for St. Paul and Akutan, Unalaska is the only important
 #  location not on Alaska Standard Time.  The following resolution was
 #  made by William Robinson and seconded by Henry Swanson: Be it
 #  resolved that the City of Unalaska hereby goes to Alaska Standard
 #  Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
 #  January 14, Alaska Standard Time.)  This resolution was passed with
 #  three votes for and one against."
 
 # Hawaii
 
 # From Arthur David Olson (2010-12-09):
 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
 # the article is available at
 # https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
 # and indicates that standard time was adopted effective noon, January
 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
 # saving for the period between the last Sunday of each April and the
 # last Sunday of each September, but less than a month later repealed the
 # act," (page 220), that year-round daylight saving time was in effect
 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
 # when clocks changed) and that clocks were changed by 30 minutes
 # effective the second Sunday of June, 1947 (page 219, with no time of
 # day given for when clocks changed). A footnote for the 1933 changes
 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
 # and Act 163 (approved 21 May 1933)."
 
 # From Arthur David Olson (2011-01-19):
 # The following is from "Laws of the Territory of Hawaii Passed by the
 # Seventeenth Legislature: Regular Session 1933," available (as of
 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
 # year, the standard time of this Territory shall be advanced one
 # hour...This Act shall take effect upon its approval. Approved this 26th
 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
 # hereby repealed...This Act shall take effect upon its approval, upon
 # which date the standard time of this Territory shall be restored to
 # that existing immediately prior to the taking effect of said Act 90.
 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
 # of the Territory of Hawaii."
 #
 # Note that 1933-05-21 was a Sunday.
 # We're left to guess the time of day when Act 163 was approved; guess noon.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Pacific/Honolulu	-10:31:26 -	LMT	1896 Jan 13 12:00
 			-10:30	-	HST	1933 Apr 30  2:00
 			-10:30	1:00	HDT	1933 May 21 12:00
 			-10:30	US	H%sT	1947 Jun  8  2:00
 			-10:00	-	HST
 
 # Now we turn to US areas that have diverged from the consensus since 1970.
 
 # Arizona mostly uses MST.
 
 # From Paul Eggert (2002-10-20):
 #
 # The information in the rest of this paragraph is derived from the
 # Daylight Saving Time web page
 #  (2002-01-23)
 # maintained by the Arizona State Library, Archives and Public Records.
 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
 # time, but by federal law railroads, airlines, bus lines, military
 # personnel, and some engaged in interstate commerce continued to
 # observe war (i.e., daylight saving) time.  The 1944-03-17 Phoenix
 # Gazette says that was the date the law changed, and that 04-01 was
 # the date the state's clocks would change.  In 1945 the State of
 # Arizona used standard time all year, again with exceptions only as
 # mandated by federal law.  Arizona observed DST in 1967, but Arizona
 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
 #
 # Shanks says the 1944 experiment came to an end on 1944-03-17.
 # Go with the Arizona State Library instead.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Phoenix	-7:28:18 -	LMT	1883 Nov 18 19:00u
 			-7:00	US	M%sT	1944 Jan  1  0:01
 			-7:00	-	MST	1944 Apr  1  0:01
 			-7:00	US	M%sT	1944 Oct  1  0:01
 			-7:00	-	MST	1967
 			-7:00	US	M%sT	1968 Mar 21
 			-7:00	-	MST
 
 # From Arthur David Olson (1988-02-13):
 # A writer from the Inter Tribal Council of Arizona, Inc.,
 # notes in private correspondence dated 1987-12-28 that "Presently, only the
 # Navajo Nation participates in the Daylight Saving Time policy, due to its
 # large size and location in three states."  (The "only" means that other
 # tribal nations don't use DST.)
 #
 # From Paul Eggert (2013-08-26):
 # See America/Denver for a zone appropriate for the Navajo Nation.
 
 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
 # Teton, Twin Falls, Valley, Washington counties, and the southern
 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
 # switched four weeks late in 1974.
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Boise	-7:44:49 -	LMT	1883 Nov 18 20:00u
 			-8:00	US	P%sT	1923 May 13  2:00
 			-7:00	US	M%sT	1974
 			-7:00	-	MST	1974 Feb  3  2:00
 			-7:00	US	M%sT
 
 # Indiana
 #
 # For a map of Indiana's time zone regions, see:
 # https://en.wikipedia.org/wiki/Time_in_Indiana
 #
 # From Paul Eggert (2018-11-30):
 # A brief but entertaining history of time in Indiana describes a 1949 debate
 # in the Indiana House where city legislators (who favored "fast time")
 # tussled with farm legislators (who didn't) over a bill to outlaw DST:
 #  "Lacking enough votes, the city faction tries to filibuster until time runs
 #   out on the session at midnight, but rural champion Rep. Herbert Copeland,
 #   R-Madison, leans over the gallery railing and forces the official clock
 #   back to 9 p.m., breaking it in the process.  The clock sticks on 9 as the
 #   debate rages on into the night.  The filibuster finally dies out and the
 #   bill passes, while outside the chamber, clocks read 3:30 a.m.  In the end,
 #   it doesn't matter which side won.  The law has no enforcement powers and
 #   is simply ignored by fast-time communities."
 # How Indiana went from 'God's time' to split zones and daylight-saving.
 # Indianapolis Star. 2018-11-27 14:58 -05.
 # https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/
 #
 # From Paul Eggert (2007-08-17):
 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
 # with the following exceptions:
 #
 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
 #   Vanderburgh, and Warrick counties have been like America/Chicago.
 #
 # - Dearborn and Ohio counties have been like America/New_York.
 #
 # - Clark, Floyd, and Harrison counties have been like
 #   America/Kentucky/Louisville.
 #
 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
 #   and Switzerland counties have their own time zone histories as noted below.
 #
 # Shanks partitioned Indiana into 345 regions, each with its own time history,
 # and wrote "Even newspaper reports present contradictory information."
 # Those Hoosiers!  Such a flighty and changeable people!
 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
 #
 # Other than Indianapolis, the Indiana place names are so nondescript
 # that they would be ambiguous if we left them at the 'America' level.
 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
 
 # From Paul Eggert (2014-06-26):
 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
 # says "DOT is relocating the time zone boundary in Indiana to move Starke,
 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
 # Eastern Time Zone to the Central Time Zone.... The effective date of
 # this rule is 2 a.m. EST Sunday, April 2, 2006, which is the
 # changeover date from standard time to Daylight Saving Time."
 # Strictly speaking, this meant the affected counties changed their
 # clocks twice that night, but this obviously was in error.  The intent
 # was that 01:59:59 EST be followed by 02:00:00 CDT.
 
 # From Gwillim Law (2007-02-10):
 # The Associated Press has been reporting that Pulaski County, Indiana is
 # going to switch from Central to Eastern Time on March 11, 2007....
 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule Indianapolis 1941	only	-	Jun	22	2:00	1:00	D
 Rule Indianapolis 1941	1954	-	Sep	lastSun	2:00	0	S
 Rule Indianapolis 1946	1954	-	Apr	lastSun	2:00	1:00	D
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 18:00u
 			-6:00	US	C%sT	1920
 			-6:00 Indianapolis C%sT	1942
 			-6:00	US	C%sT	1946
 			-6:00 Indianapolis C%sT	1955 Apr 24  2:00
 			-5:00	-	EST	1957 Sep 29  2:00
 			-6:00	-	CST	1958 Apr 27  2:00
 			-5:00	-	EST	1969
 			-5:00	US	E%sT	1971
 			-5:00	-	EST	2006
 			-5:00	US	E%sT
 #
 # Eastern Crawford County, Indiana, left its clocks alone in 1974,
 # as well as from 1976 through 2005.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Marengo	1951	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Marengo	1951	only	-	Sep	lastSun	2:00	0	S
 Rule	Marengo	1954	1960	-	Apr	lastSun	2:00	1:00	D
 Rule	Marengo	1954	1960	-	Sep	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Marengo -5:45:23 -	LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1951
 			-6:00	Marengo	C%sT	1961 Apr 30  2:00
 			-5:00	-	EST	1969
 			-5:00	US	E%sT	1974 Jan  6  2:00
 			-6:00	1:00	CDT	1974 Oct 27  2:00
 			-5:00	US	E%sT	1976
 			-5:00	-	EST	2006
 			-5:00	US	E%sT
 #
 # Daviess, Dubois, Knox, and Martin Counties, Indiana,
 # switched from eastern to central time in April 2006, then switched back
 # in November 2007.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule Vincennes	1946	only	-	Apr	lastSun	2:00	1:00	D
 Rule Vincennes	1946	only	-	Sep	lastSun	2:00	0	S
 Rule Vincennes	1953	1954	-	Apr	lastSun	2:00	1:00	D
 Rule Vincennes	1953	1959	-	Sep	lastSun	2:00	0	S
 Rule Vincennes	1955	only	-	May	 1	0:00	1:00	D
 Rule Vincennes	1956	1963	-	Apr	lastSun	2:00	1:00	D
 Rule Vincennes	1960	only	-	Oct	lastSun	2:00	0	S
 Rule Vincennes	1961	only	-	Sep	lastSun	2:00	0	S
 Rule Vincennes	1962	1963	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Vincennes -5:50:07 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1946
 			-6:00 Vincennes	C%sT	1964 Apr 26  2:00
 			-5:00	-	EST	1969
 			-5:00	US	E%sT	1971
 			-5:00	-	EST	2006 Apr  2  2:00
 			-6:00	US	C%sT	2007 Nov  4  2:00
 			-5:00	US	E%sT
 #
 # Perry County, Indiana, switched from eastern to central time in April 2006.
 # From Alois Treindl (2019-07-09):
 # The Indianapolis News, Friday 27 October 1967 states that Perry County
 # returned to CST.  It went again to EST on 27 April 1969, as documented by the
 # Indianapolis star of Saturday 26 April.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule Perry	1955	only	-	May	 1	0:00	1:00	D
 Rule Perry	1955	1960	-	Sep	lastSun	2:00	0	S
 Rule Perry	1956	1963	-	Apr	lastSun	2:00	1:00	D
 Rule Perry	1961	1963	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Tell_City -5:47:03 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1946
 			-6:00 Perry	C%sT	1964 Apr 26  2:00
 			-5:00	-	EST	1967 Oct 29  2:00
 			-6:00	US	C%sT	1969 Apr 27  2:00
 			-5:00	US	E%sT	1971
 			-5:00	-	EST	2006 Apr  2  2:00
 			-6:00	US	C%sT
 #
 # Pike County, Indiana moved from central to eastern time in 1977,
 # then switched back in 2006, then switched back again in 2007.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Pike	1955	only	-	May	 1	0:00	1:00	D
 Rule	Pike	1955	1960	-	Sep	lastSun	2:00	0	S
 Rule	Pike	1956	1964	-	Apr	lastSun	2:00	1:00	D
 Rule	Pike	1961	1964	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Petersburg -5:49:07 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1955
 			-6:00	Pike	C%sT	1965 Apr 25  2:00
 			-5:00	-	EST	1966 Oct 30  2:00
 			-6:00	US	C%sT	1977 Oct 30  2:00
 			-5:00	-	EST	2006 Apr  2  2:00
 			-6:00	US	C%sT	2007 Nov  4  2:00
 			-5:00	US	E%sT
 #
 # Starke County, Indiana moved from central to eastern time in 1991,
 # then switched back in 2006.
 # From Arthur David Olson (1991-10-28):
 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
 # notes that Starke County switched from Central time to Eastern time as of
 # 1991-10-27.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Starke	1947	1961	-	Apr	lastSun	2:00	1:00	D
 Rule	Starke	1947	1954	-	Sep	lastSun	2:00	0	S
 Rule	Starke	1955	1956	-	Oct	lastSun	2:00	0	S
 Rule	Starke	1957	1958	-	Sep	lastSun	2:00	0	S
 Rule	Starke	1959	1961	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Knox -5:46:30 -	LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1947
 			-6:00	Starke	C%sT	1962 Apr 29  2:00
 			-5:00	-	EST	1963 Oct 27  2:00
 			-6:00	US	C%sT	1991 Oct 27  2:00
 			-5:00	-	EST	2006 Apr  2  2:00
 			-6:00	US	C%sT
 #
 # Pulaski County, Indiana, switched from eastern to central time in
 # April 2006 and then switched back in March 2007.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Pulaski	1946	1960	-	Apr	lastSun	2:00	1:00	D
 Rule	Pulaski	1946	1954	-	Sep	lastSun	2:00	0	S
 Rule	Pulaski	1955	1956	-	Oct	lastSun	2:00	0	S
 Rule	Pulaski	1957	1960	-	Sep	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Winamac -5:46:25 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1946
 			-6:00	Pulaski	C%sT	1961 Apr 30  2:00
 			-5:00	-	EST	1969
 			-5:00	US	E%sT	1971
 			-5:00	-	EST	2006 Apr  2  2:00
 			-6:00	US	C%sT	2007 Mar 11  2:00
 			-5:00	US	E%sT
 #
 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Indiana/Vevay -5:40:16 -	LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1954 Apr 25  2:00
 			-5:00	-	EST	1969
 			-5:00	US	E%sT	1973
 			-5:00	-	EST	2006
 			-5:00	US	E%sT
 
 # From Paul Eggert (2018-03-20):
 # The Louisville & Nashville Railroad's 1883-11-18 change occurred at
 # 10:00 old local time; train were supposed to come to a standstill
 # for precisely 18 minutes.  See Bartky Fig. 1 (page 50).  It is not
 # clear how this matched civil time in Louisville, so for now continue
 # to assume Louisville switched at noon new local time, like New York.
 #
 # From Michael Deckers (2019-08-06):
 # From the contemporary source given by Alois Treindl,
 # the switch in Louisville on 1946-04-28 was on 00:01
 # From Paul Eggert (2019-08-26):
 # That source was the Louisville Courier-Journal, 1946-04-27, p 4.
 # Shanks gives 02:00 for all 20th-century transition times in Louisville.
 # Evidently this is wrong for spring 1946.  Although also likely wrong
 # for other dates, we have no data.
 #
 # Part of Kentucky left its clocks alone in 1974.
 # This also includes Clark, Floyd, and Harrison counties in Indiana.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule Louisville	1921	only	-	May	1	2:00	1:00	D
 Rule Louisville	1921	only	-	Sep	1	2:00	0	S
 Rule Louisville	1941	only	-	Apr	lastSun	2:00	1:00	D
 Rule Louisville	1941	only	-	Sep	lastSun	2:00	0	S
 Rule Louisville	1946	only	-	Apr	lastSun	0:01	1:00	D
 Rule Louisville	1946	only	-	Jun	2	2:00	0	S
 Rule Louisville	1950	1961	-	Apr	lastSun	2:00	1:00	D
 Rule Louisville	1950	1955	-	Sep	lastSun	2:00	0	S
 Rule Louisville	1956	1961	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Kentucky/Louisville -5:43:02 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1921
 			-6:00 Louisville C%sT	1942
 			-6:00	US	C%sT	1946
 			-6:00 Louisville C%sT	1961 Jul 23  2:00
 			-5:00	-	EST	1968
 			-5:00	US	E%sT	1974 Jan  6  2:00
 			-6:00	1:00	CDT	1974 Oct 27  2:00
 			-5:00	US	E%sT
 #
 # Wayne County, Kentucky
 #
 # From Lake Cumberland LIFE
 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
 # (1999-01-29) via WKYM-101.7:
 # Clinton County has joined Wayne County in asking the DoT to change from
 # the Central to the Eastern time zone....  The Wayne County government made
 # the same request in December.  And while Russell County officials have not
 # taken action, the majority of respondents to a poll conducted there in
 # August indicated they would like to change to "fast time" also.
 # The three Lake Cumberland counties are the farthest east of any U.S.
 # location in the Central time zone.
 #
 # From Rich Wales (2000-08-29):
 # After prolonged debate, and despite continuing deep differences of opinion,
 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
 # (-0500) time.  They won't "fall back" this year.  See Sara Shipley,
 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
 #
 # From Paul Eggert (2001-07-16):
 # The final rule was published in the
 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
 # https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm
 #
 Zone America/Kentucky/Monticello -5:39:24 - LMT	1883 Nov 18 18:00u
 			-6:00	US	C%sT	1946
 			-6:00	-	CST	1968
 			-6:00	US	C%sT	2000 Oct 29  2:00
 			-5:00	US	E%sT
 
 
 # From Rives McDow (2000-08-30):
 # Here ... are all the changes in the US since 1985.
 # Kearny County, KS (put all of county on central;
 #	previously split between MST and CST) ... 1990-10
 # Starke County, IN (from CST to EST) ... 1991-10
 # Oliver County, ND (from MST to CST) ... 1992-10
 # West Wendover, NV (from PST TO MST) ... 1999-10
 # Wayne County, KY (from CST to EST) ... 2000-10
 #
 # From Paul Eggert (2001-07-17):
 # We don't know where the line used to be within Kearny County, KS,
 # so omit that change for now.
 # See America/Indiana/Knox for the Starke County, IN change.
 # See America/North_Dakota/Center for the Oliver County, ND change.
 # West Wendover, NV officially switched from Pacific to mountain time on
 # 1999-10-31.  See the
 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
 # https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm
 # However, the Federal Register says that West Wendover already operated
 # on mountain time, and the rule merely made this official;
 # hence a separate tz entry is not needed.
 
 # Michigan
 #
 # From Bob Devine (1988-01-28):
 # Michigan didn't observe DST from 1968 to 1973.
 #
 # From Paul Eggert (1999-03-31):
 # Shanks writes that Michigan started using standard time on 1885-09-18,
 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
 # that Detroit kept
 #
 #	local time until 1900 when the City Council decreed that clocks should
 #	be put back twenty-eight minutes to Central Standard Time.  Half the
 #	city obeyed, half refused.  After considerable debate, the decision
 #	was rescinded and the city reverted to Sun time.  A derisive offer to
 #	erect a sundial in front of the city hall was referred to the
 #	Committee on Sewers.  Then, in 1905, Central time was adopted
 #	by city vote.
 #
 # This story is too entertaining to be false, so go with Howse over Shanks.
 #
 # From Paul Eggert (2001-03-06):
 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
 # one hour in 1914."  This change is not in Shanks.  We have no more
 # info, so omit this for now.
 #
 # From Paul Eggert (2019-07-06):
 # Due to a complicated set of legal maneuvers, in 1967 Michigan did
 # not start daylight saving time when the rest of the US did.
 # Instead, it began DST on Jun 14 at 00:01.  This was big news:
 # the Detroit Free Press reported it at the top of Page 1 on
 # 1967-06-14, in an article "State Adjusting to Switch to Fast Time"
 # by Gary Blonston, above an article about Thurgood Marshall's
 # confirmation to the US Supreme Court.  Although Shanks says Detroit
 # observed DST until 1967-10-29 00:01, that time of day seems to be
 # incorrect, as the Free Press later said DST ended in Michigan at the
 # same time as the rest of the US.  Also, although Shanks reports no DST in
 # Detroit in 1968, it did observe DST that year; in the November 1968
 # election Michigan voters narrowly repealed DST, effective 1969.
 #
 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule	Detroit	1948	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Detroit	1948	only	-	Sep	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Detroit	-5:32:11 -	LMT	1905
 			-6:00	-	CST	1915 May 15  2:00
 			-5:00	-	EST	1942
 			-5:00	US	E%sT	1946
 			-5:00	Detroit	E%sT	1967 Jun 14  0:01
 			-5:00	US	E%sT	1969
 			-5:00	-	EST	1973
 			-5:00	US	E%sT	1975
 			-5:00	-	EST	1975 Apr 27  2:00
 			-5:00	US	E%sT
 #
 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
 # switched from EST to CST/CDT in 1973.
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER
 Rule Menominee	1946	only	-	Apr	lastSun	2:00	1:00	D
 Rule Menominee	1946	only	-	Sep	lastSun	2:00	0	S
 Rule Menominee	1966	only	-	Apr	lastSun	2:00	1:00	D
 Rule Menominee	1966	only	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Menominee	-5:50:27 -	LMT	1885 Sep 18 12:00
 			-6:00	US	C%sT	1946
 			-6:00 Menominee	C%sT	1969 Apr 27  2:00
 			-5:00	-	EST	1973 Apr 29  2:00
 			-6:00	US	C%sT
 
 # Navassa
 # administered by the US Fish and Wildlife Service
 # claimed by US under the provisions of the 1856 Guano Islands Act
 # also claimed by Haiti
 # occupied 1857/1900 by the Navassa Phosphate Co
 # US lighthouse 1917/1996-09
 # currently uninhabited
 # see Mark Fineman, "An Isle Rich in Guano and Discord",
 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
 
 ################################################################################
 
 
 # From Paul Eggert (2017-02-10):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 #
 # Many years ago Gwillim Law wrote that a good source
 # for time zone data was the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
 # of the IATA's data after 1990.  Except where otherwise noted,
 # IATA SSIM is the source for entries after 1990.
 #
 # Other sources occasionally used include:
 #
 #	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
 #	.
 #
 #	Pearce C. The Great Daylight Saving Time Controversy.
 #	Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8.
 #
 #	Edward W. Whitman, World Time Differences,
 #	Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
 #	which I found in the UCLA library.
 #
 #	William Willett, The Waste of Daylight, 19th edition
 #	
 #	[PDF] (1914-03)
 #
 # See the 'europe' file for Greenland.
 
 # Canada
 
 # From Alain LaBonté (1994-11-14):
 # I post here the time zone abbreviations standardized in Canada
 # for both English and French in the CAN/CSA-Z234.4-89 standard....
 #
 #	UTC	Standard time	Daylight saving time
 #	offset	French	English	French	English
 #	-2:30	-	-	HAT	NDT
 #	-3	-	-	HAA	ADT
 #	-3:30	HNT	NST	-	-
 #	-4	HNA	AST	HAE	EDT
 #	-5	HNE	EST	HAC	CDT
 #	-6	HNC	CST	HAR	MDT
 #	-7	HNR	MST	HAP	PDT
 #	-8	HNP	PST	HAY	YDT
 #	-9	HNY	YST	-	-
 #
 #	HN: Heure Normale	ST: Standard Time
 #	HA: Heure Avancée	DT: Daylight saving Time
 #
 #	A: de l'Atlantique	Atlantic
 #	C: du Centre		Central
 #	E: de l'Est		Eastern
 #	M:			Mountain
 #	N:			Newfoundland
 #	P: du Pacifique		Pacific
 #	R: des Rocheuses
 #	T: de Terre-Neuve
 #	Y: du Yukon		Yukon
 #
 # From Paul Eggert (1994-11-22):
 # Alas, this sort of thing must be handled by localization software.
 
 # Unless otherwise specified, the data entries for Canada are all from Shanks
 # & Pottenger.
 
 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
 # 2007-03-01):
 # The British Columbia government announced yesterday that it will
 # adjust daylight savings next year to align with changes in the
 # U.S. and the rest of Canada....
 # https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm
 # ...
 # Nova Scotia
 # Daylight saving time will be extended by four weeks starting in 2007....
 # https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf
 #
 # [For New Brunswick] the new legislation dictates that the time change is to
 # be done at 02:00 instead of 00:01.
 # https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
 # ...
 # Manitoba has traditionally changed the clock every fall at 03:00.
 # As of 2006, the transition is to take place one hour earlier at 02:00.
 # https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
 # ...
 # [Alberta, Ontario, Quebec] will follow US rules.
 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
 # ...
 # P.E.I. will follow US rules....
 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
 # ...
 # Province of Newfoundland and Labrador....
 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
 # ...
 # Yukon
 # https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
 # ...
 # N.W.T. will follow US rules.  Whoever maintains the government web site
 # does not seem to believe in bookmarks.  To see the news release, click the
 # following link and search for "Daylight Savings Time Change".  Press the
 # "Daylight Savings Time Change" link; it will fire off a popup using
 # JavaScript.
 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
 # ...
 # Nunavut
 # An amendment to the Interpretation Act was registered on February 19/2007....
 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
 
 # From Paul Eggert (2014-10-18):
 # H. David Matthews and Mary Vincent's map
 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
 # contains detailed boundaries for regions observing nonstandard
 # time and daylight saving time arrangements in Canada circa 1998.
 #
 # National Research Council Canada maintains info about time zones and DST.
 # https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
 # https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
 # Its unofficial information is often taken from Matthews and Vincent.
 
 # From Paul Eggert (2006-06-27):
 # For now, assume all of DST-observing Canada will fall into line with the
 # new US DST rules,
 
 # From Chris Walton (2011-12-01)
 # In the first of Tammy Hardwick's articles
 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
 # she quotes the Friday November 1/1918 edition of the Creston Review.
 # The quote includes these two statements:
 # 'Sunday the CPR went back to the old system of time...'
 # '... The daylight saving scheme was dropped all over Canada at the same time,'
 # These statements refer to a transition from daylight time to standard time
 # that occurred nationally on Sunday October 27/1918.  This transition was
 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
 
 # In light of that evidence, we alter the date from the earlier believed
 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
 # than Thursday) in all Canadian rulesets.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Canada	1918	only	-	Apr	14	2:00	1:00	D
 Rule	Canada	1918	only	-	Oct	27	2:00	0	S
 Rule	Canada	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Canada	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Canada	1945	only	-	Sep	30	2:00	0	S
 Rule	Canada	1974	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Canada	1974	2006	-	Oct	lastSun	2:00	0	S
 Rule	Canada	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
 Rule	Canada	2007	max	-	Mar	Sun>=8	2:00	1:00	D
 Rule	Canada	2007	max	-	Nov	Sun>=1	2:00	0	S
 
 
 # Newfoundland and Labrador
 
 # From Paul Eggert (2017-10-14):
 # Legally Labrador should observe Newfoundland time; see:
 # McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07
 # http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/
 # Matthews and Vincent (1998) write that the only part of Labrador
 # that follows the rules is the southeast corner, including Port Hope
 # Simpson and Mary's Harbour, but excluding, say, Black Tickle.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	StJohns	1917	only	-	Apr	 8	2:00	1:00	D
 Rule	StJohns	1917	only	-	Sep	17	2:00	0	S
 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
 Rule	StJohns	1919	only	-	May	 5	23:00	1:00	D
 Rule	StJohns	1919	only	-	Aug	12	23:00	0	S
 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
 Rule	StJohns	1920	1935	-	May	Sun>=1	23:00	1:00	D
 Rule	StJohns	1920	1935	-	Oct	lastSun	23:00	0	S
 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
 # Pottenger.
 Rule	StJohns	1936	1941	-	May	Mon>=9	0:00	1:00	D
 Rule	StJohns	1936	1941	-	Oct	Mon>=2	0:00	0	S
 # Whitman gives the following transitions:
 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
 # but go with Shanks & Pottenger and assume they used Canadian rules.
 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
 # Apr 30 - Sep 24; go with Shanks & Pottenger.
 Rule	StJohns	1946	1950	-	May	Sun>=8	2:00	1:00	D
 Rule	StJohns	1946	1950	-	Oct	Sun>=2	2:00	0	S
 Rule	StJohns	1951	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	StJohns	1951	1959	-	Sep	lastSun	2:00	0	S
 Rule	StJohns	1960	1986	-	Oct	lastSun	2:00	0	S
 # From Paul Eggert (2000-10-02):
 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
 # at 00:01 local time.  For now, assume it started in 1987.
 
 # From Michael Pelley (2011-09-12):
 # We received today, Monday, September 12, 2011, notification that the
 # changes to the Newfoundland Standard Time Act have been proclaimed.
 # The change in the Act stipulates that the change from Daylight Savings
 # Time to Standard Time and from Standard Time to Daylight Savings Time
 # now occurs at 2:00AM.
 # ...
 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
 # ...
 # MICHAEL PELLEY  |  Manager of Enterprise Architecture - Solution Delivery
 # Office of the Chief Information Officer
 # Executive Council
 # Government of Newfoundland & Labrador
 
 Rule	StJohns	1987	only	-	Apr	Sun>=1	0:01	1:00	D
 Rule	StJohns	1987	2006	-	Oct	lastSun	0:01	0	S
 Rule	StJohns	1988	only	-	Apr	Sun>=1	0:01	2:00	DD
 Rule	StJohns	1989	2006	-	Apr	Sun>=1	0:01	1:00	D
 Rule	StJohns	2007	2011	-	Mar	Sun>=8	0:01	1:00	D
 Rule	StJohns	2007	2010	-	Nov	Sun>=1	0:01	0	S
 #
 # St John's has an apostrophe, but Posix file names can't have apostrophes.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/St_Johns	-3:30:52 -	LMT	1884
 			-3:30:52 StJohns N%sT	1918
 			-3:30:52 Canada	N%sT	1919
 			-3:30:52 StJohns N%sT	1935 Mar 30
 			-3:30	StJohns	N%sT	1942 May 11
 			-3:30	Canada	N%sT	1946
 			-3:30	StJohns	N%sT	2011 Nov
 			-3:30	Canada	N%sT
 
 # most of east Labrador
 
 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Goose_Bay	-4:01:40 -	LMT	1884 # Happy Valley-Goose Bay
 			-3:30:52 -	NST	1918
 			-3:30:52 Canada N%sT	1919
 			-3:30:52 -	NST	1935 Mar 30
 			-3:30	-	NST	1936
 			-3:30	StJohns	N%sT	1942 May 11
 			-3:30	Canada	N%sT	1946
 			-3:30	StJohns	N%sT	1966 Mar 15  2:00
 			-4:00	StJohns	A%sT	2011 Nov
 			-4:00	Canada	A%sT
 
 
 # west Labrador, Nova Scotia, Prince Edward I,
 # Îles-de-la-Madeleine, Listuguj reserve
 
 # From Brian Inglis (2015-07-20):
 # From the historical weather station records available at:
 # https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada
 # Sydney shares the same time history as Glace Bay, so was
 # likely to be the same across the island....
 # Sydney, as the capital and most populous location, or Cape Breton, would
 # have been better names for the zone had we known this in 1996.
 
 # From Paul Eggert (2015-07-20):
 # Shanks & Pottenger write that since 1970 most of this region has been like
 # Halifax.  Many locales did not observe peacetime DST until 1972;
 # the Cape Breton area, represented by Glace Bay, is the largest we know of
 # (Glace Bay was perhaps not the best name choice but no point changing now).
 # Shanks & Pottenger also write that Liverpool, NS was the only town
 # in Canada to observe DST in 1971 but not 1970; for now we'll assume
 # this is a typo.
 
 # From Jeffery Nichols (2020-01-09):
 # America/Halifax ... also applies to Îles-de-la-Madeleine and the Listuguj
 # reserve in Quebec. Officially, this came into effect on January 1, 2007
 # (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that
 # bill say that it is "accommodating the customs and practices" of those
 # regions, which suggests that they have always been in-line with Halifax.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Halifax	1916	only	-	Apr	 1	0:00	1:00	D
 Rule	Halifax	1916	only	-	Oct	 1	0:00	0	S
 Rule	Halifax	1920	only	-	May	 9	0:00	1:00	D
 Rule	Halifax	1920	only	-	Aug	29	0:00	0	S
 Rule	Halifax	1921	only	-	May	 6	0:00	1:00	D
 Rule	Halifax	1921	1922	-	Sep	 5	0:00	0	S
 Rule	Halifax	1922	only	-	Apr	30	0:00	1:00	D
 Rule	Halifax	1923	1925	-	May	Sun>=1	0:00	1:00	D
 Rule	Halifax	1923	only	-	Sep	 4	0:00	0	S
 Rule	Halifax	1924	only	-	Sep	15	0:00	0	S
 Rule	Halifax	1925	only	-	Sep	28	0:00	0	S
 Rule	Halifax	1926	only	-	May	16	0:00	1:00	D
 Rule	Halifax	1926	only	-	Sep	13	0:00	0	S
 Rule	Halifax	1927	only	-	May	 1	0:00	1:00	D
 Rule	Halifax	1927	only	-	Sep	26	0:00	0	S
 Rule	Halifax	1928	1931	-	May	Sun>=8	0:00	1:00	D
 Rule	Halifax	1928	only	-	Sep	 9	0:00	0	S
 Rule	Halifax	1929	only	-	Sep	 3	0:00	0	S
 Rule	Halifax	1930	only	-	Sep	15	0:00	0	S
 Rule	Halifax	1931	1932	-	Sep	Mon>=24	0:00	0	S
 Rule	Halifax	1932	only	-	May	 1	0:00	1:00	D
 Rule	Halifax	1933	only	-	Apr	30	0:00	1:00	D
 Rule	Halifax	1933	only	-	Oct	 2	0:00	0	S
 Rule	Halifax	1934	only	-	May	20	0:00	1:00	D
 Rule	Halifax	1934	only	-	Sep	16	0:00	0	S
 Rule	Halifax	1935	only	-	Jun	 2	0:00	1:00	D
 Rule	Halifax	1935	only	-	Sep	30	0:00	0	S
 Rule	Halifax	1936	only	-	Jun	 1	0:00	1:00	D
 Rule	Halifax	1936	only	-	Sep	14	0:00	0	S
 Rule	Halifax	1937	1938	-	May	Sun>=1	0:00	1:00	D
 Rule	Halifax	1937	1941	-	Sep	Mon>=24	0:00	0	S
 Rule	Halifax	1939	only	-	May	28	0:00	1:00	D
 Rule	Halifax	1940	1941	-	May	Sun>=1	0:00	1:00	D
 Rule	Halifax	1946	1949	-	Apr	lastSun	2:00	1:00	D
 Rule	Halifax	1946	1949	-	Sep	lastSun	2:00	0	S
 Rule	Halifax	1951	1954	-	Apr	lastSun	2:00	1:00	D
 Rule	Halifax	1951	1954	-	Sep	lastSun	2:00	0	S
 Rule	Halifax	1956	1959	-	Apr	lastSun	2:00	1:00	D
 Rule	Halifax	1956	1959	-	Sep	lastSun	2:00	0	S
 Rule	Halifax	1962	1973	-	Apr	lastSun	2:00	1:00	D
 Rule	Halifax	1962	1973	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Halifax	-4:14:24 -	LMT	1902 Jun 15
 			-4:00	Halifax	A%sT	1918
 			-4:00	Canada	A%sT	1919
 			-4:00	Halifax	A%sT	1942 Feb  9  2:00s
 			-4:00	Canada	A%sT	1946
 			-4:00	Halifax	A%sT	1974
 			-4:00	Canada	A%sT
 Zone America/Glace_Bay	-3:59:48 -	LMT	1902 Jun 15
 			-4:00	Canada	A%sT	1953
 			-4:00	Halifax	A%sT	1954
 			-4:00	-	AST	1972
 			-4:00	Halifax	A%sT	1974
 			-4:00	Canada	A%sT
 
 # New Brunswick
 
 # From Paul Eggert (2007-01-31):
 # The Time Definition Act 
 # says they changed at 00:01 through 2006, and
 #  makes it
 # clear that this was the case since at least 1993.
 # For now, assume it started in 1993.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Moncton	1933	1935	-	Jun	Sun>=8	1:00	1:00	D
 Rule	Moncton	1933	1935	-	Sep	Sun>=8	1:00	0	S
 Rule	Moncton	1936	1938	-	Jun	Sun>=1	1:00	1:00	D
 Rule	Moncton	1936	1938	-	Sep	Sun>=1	1:00	0	S
 Rule	Moncton	1939	only	-	May	27	1:00	1:00	D
 Rule	Moncton	1939	1941	-	Sep	Sat>=21	1:00	0	S
 Rule	Moncton	1940	only	-	May	19	1:00	1:00	D
 Rule	Moncton	1941	only	-	May	 4	1:00	1:00	D
 Rule	Moncton	1946	1972	-	Apr	lastSun	2:00	1:00	D
 Rule	Moncton	1946	1956	-	Sep	lastSun	2:00	0	S
 Rule	Moncton	1957	1972	-	Oct	lastSun	2:00	0	S
 Rule	Moncton	1993	2006	-	Apr	Sun>=1	0:01	1:00	D
 Rule	Moncton	1993	2006	-	Oct	lastSun	0:01	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Moncton	-4:19:08 -	LMT	1883 Dec  9
 			-5:00	-	EST	1902 Jun 15
 			-4:00	Canada	A%sT	1933
 			-4:00	Moncton	A%sT	1942
 			-4:00	Canada	A%sT	1946
 			-4:00	Moncton	A%sT	1973
 			-4:00	Canada	A%sT	1993
 			-4:00	Moncton	A%sT	2007
 			-4:00	Canada	A%sT
 
 # Quebec
 
 # From Paul Eggert (2020-01-10):
 # See America/Toronto for most of Quebec, including Montreal.
 # See America/Halifax for the Îles de la Madeleine and the Listuguj reserve.
 # See America/Puerto_Rico for east of Natashquan.
 
 # Ontario
 
 # From Mark Brader (2003-07-26):
 # [According to the Toronto Star] Orillia, Ontario, adopted DST
 # effective Saturday, 1912-06-22, 22:00; the article mentions that
 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
 # have already done so.  In Orillia DST was to run until Saturday,
 # 1912-08-31 (no time mentioned), but it was met with considerable
 # hostility from certain segments of the public, and was revoked after
 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
 # presumably that should be -07-06.  (1912-06-19, -07-12; also letters
 # earlier in June).
 #
 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
 #
 # From Paul Eggert (2017-07-08):
 # For more on Orillia, see: Daubs K. Bold attempt at daylight saving
 # time became a comic failure in Orillia. Toronto Star 2017-07-08.
 # https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html
 
 # From Mark Brader (2010-03-06):
 #
 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
 # right corner of page 1, it says that Toronto will return to standard
 # time at 2 am Sunday morning (which agrees with the database), and that:
 #
 #     The one-hour setback will go into effect throughout most of Ontario,
 #     except in areas like Windsor which remains on standard time all year.
 #
 # ... I don't know if Windsor began observing DST when Detroit did,
 # or in 1974, or on some other date.
 #
 # By the way, the article continues by noting that:
 #
 #     Some cities in the United States have pushed the deadline back
 #     three weeks and will change over from daylight saving in October.
 
 # From Arthur David Olson (2010-07-17):
 #
 # "Standard Time and Time Zones in Canada" appeared in
 # The Journal of The Royal Astronomical Society of Canada,
 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
 # was available at
 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
 #
 # It includes the text below (starting on page 57):
 #
 #   A list of the places in Canada using daylight saving time would
 # require yearly revision. From information kindly furnished by
 # the provincial governments and by the postmasters in many cities
 # and towns, it is found that the following places used daylight sav-
 # ing in 1930. The information for the province of Quebec is definite,
 # for the other provinces only approximate:
 #
 #	Province	Daylight saving time used
 # Prince Edward Island	Not used.
 # Nova Scotia		In Halifax only.
 # New Brunswick		In St. John only.
 # Quebec		In the following places:
 #			Montreal	Lachine
 #			Quebec		Mont-Royal
 #			Lévis		Iberville
 #			St. Lambert	Cap de la Madelèine
 #			Verdun		Loretteville
 #			Westmount	Richmond
 #			Outremont	St. Jérôme
 #			Longueuil	Greenfield Park
 #			Arvida		Waterloo
 #			Chambly-Canton	Beaulieu
 #			Melbourne	La Tuque
 #			St. Théophile	Buckingham
 # Ontario		Used generally in the cities and towns along
 #			the southerly part of the province. Not
 #			used in the northwesterly part.
 # Manitoba		Not used.
 # Saskatchewan		In Regina only.
 # Alberta		Not used.
 # British Columbia	Not used.
 #
 #   With some exceptions, the use of daylight saving may be said to be limited
 # to those cities and towns lying between Quebec city and Windsor, Ont.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Toronto	1919	only	-	Mar	30	23:30	1:00	D
 Rule	Toronto	1919	only	-	Oct	26	0:00	0	S
 Rule	Toronto	1920	only	-	May	 2	2:00	1:00	D
 Rule	Toronto	1920	only	-	Sep	26	0:00	0	S
 Rule	Toronto	1921	only	-	May	15	2:00	1:00	D
 Rule	Toronto	1921	only	-	Sep	15	2:00	0	S
 Rule	Toronto	1922	1923	-	May	Sun>=8	2:00	1:00	D
 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
 # was meant.
 Rule	Toronto	1922	1926	-	Sep	Sun>=15	2:00	0	S
 Rule	Toronto	1924	1927	-	May	Sun>=1	2:00	1:00	D
 Rule	Toronto	1927	1937	-	Sep	Sun>=25	2:00	0	S
 Rule	Toronto	1928	1937	-	Apr	Sun>=25	2:00	1:00	D
 Rule	Toronto	1938	1940	-	Apr	lastSun	2:00	1:00	D
 Rule	Toronto	1938	1939	-	Sep	lastSun	2:00	0	S
 Rule	Toronto	1945	1946	-	Sep	lastSun	2:00	0	S
 Rule	Toronto	1946	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Toronto	1947	1949	-	Apr	lastSun	0:00	1:00	D
 Rule	Toronto	1947	1948	-	Sep	lastSun	0:00	0	S
 Rule	Toronto	1949	only	-	Nov	lastSun	0:00	0	S
 Rule	Toronto	1950	1973	-	Apr	lastSun	2:00	1:00	D
 Rule	Toronto	1950	only	-	Nov	lastSun	2:00	0	S
 Rule	Toronto	1951	1956	-	Sep	lastSun	2:00	0	S
 # Shanks & Pottenger say Toronto ended DST a week early in 1971,
 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
 # is wrong, and that he had confirmed it by checking the 1971-10-30
 # Toronto Star, which said that DST was ending 1971-10-31 as usual.
 Rule	Toronto	1957	1973	-	Oct	lastSun	2:00	0	S
 
 # The Bahamas match Toronto since 1970.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Toronto	-5:17:32 -	LMT	1895
 			-5:00	Canada	E%sT	1919
 			-5:00	Toronto	E%sT	1942 Feb  9  2:00s
 			-5:00	Canada	E%sT	1946
 			-5:00	Toronto	E%sT	1974
 			-5:00	Canada	E%sT
 # For Atikokan see America/Panama.
 
 
 # Manitoba
 
 # From Rob Douglas (2006-04-06):
 # the old Manitoba Time Act - as amended by Bill 2, assented to
 # March 27, 1987 ... said ...
 # "between two o'clock Central Standard Time in the morning of
 # the first Sunday of April of each year and two o'clock Central
 # Standard Time in the morning of the last Sunday of October next
 # following, one hour in advance of Central Standard Time."...
 # I believe that the English legislation [of the old time act] had
 # been assented to (March 22, 1967)....
 # Also, as far as I can tell, there was no order-in-council varying
 # the time of Daylight Saving Time for 2005 and so the provisions of
 # the 1987 version would apply - the changeover was at 2:00 Central
 # Standard Time (i.e. not until 3:00 Central Daylight Time).
 
 # From Paul Eggert (2006-04-10):
 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
 # starting 1966.  Since 02:00s is clearly correct for 1967 on, assume
 # it was also 02:00s in 1966.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Winn	1916	only	-	Apr	23	0:00	1:00	D
 Rule	Winn	1916	only	-	Sep	17	0:00	0	S
 Rule	Winn	1918	only	-	Apr	14	2:00	1:00	D
 Rule	Winn	1918	only	-	Oct	27	2:00	0	S
 Rule	Winn	1937	only	-	May	16	2:00	1:00	D
 Rule	Winn	1937	only	-	Sep	26	2:00	0	S
 Rule	Winn	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Winn	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Winn	1945	only	-	Sep	lastSun	2:00	0	S
 Rule	Winn	1946	only	-	May	12	2:00	1:00	D
 Rule	Winn	1946	only	-	Oct	13	2:00	0	S
 Rule	Winn	1947	1949	-	Apr	lastSun	2:00	1:00	D
 Rule	Winn	1947	1949	-	Sep	lastSun	2:00	0	S
 Rule	Winn	1950	only	-	May	 1	2:00	1:00	D
 Rule	Winn	1950	only	-	Sep	30	2:00	0	S
 Rule	Winn	1951	1960	-	Apr	lastSun	2:00	1:00	D
 Rule	Winn	1951	1958	-	Sep	lastSun	2:00	0	S
 Rule	Winn	1959	only	-	Oct	lastSun	2:00	0	S
 Rule	Winn	1960	only	-	Sep	lastSun	2:00	0	S
 Rule	Winn	1963	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Winn	1963	only	-	Sep	22	2:00	0	S
 Rule	Winn	1966	1986	-	Apr	lastSun	2:00s	1:00	D
 Rule	Winn	1966	2005	-	Oct	lastSun	2:00s	0	S
 Rule	Winn	1987	2005	-	Apr	Sun>=1	2:00s	1:00	D
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
 			-6:00	Winn	C%sT	2006
 			-6:00	Canada	C%sT
 
 
 # Saskatchewan
 
 # From Mark Brader (2003-07-26):
 # The first actual adoption of DST in Canada was at the municipal
 # level.  As the [Toronto] Star put it (1912-06-07), "While people
 # elsewhere have long been talking of legislation to save daylight,
 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
 # presumably late evening, as below), and would run until "the end of
 # the summer".  The discrepancy between municipal time and railroad
 # time was noted.
 
 # From Paul Eggert (2003-07-27):
 # Willett (1914-03) notes that DST "has been in operation ... in the
 # City of Moose Jaw, Saskatchewan, for one year."
 
 # From Paul Eggert (2019-07-25):
 # Pearce's book says Regina observed DST in 1914-1917.  No dates and times,
 # unfortunately.  It also says that in 1914 Saskatoon observed DST
 # from 1 June to 6 July, and that DST was also tried out in Davidson,
 # Melfort, and Prince Albert.
 
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
 # Other western towns (e.g. Lloydminster) are like Edmonton.
 # Matthews and Vincent (1998) write that Denare Beach and Creighton
 # are like Winnipeg, in violation of Saskatchewan law.
 
 # From W. Jones (1992-11-06):
 # The. . .below is based on information I got from our law library, the
 # provincial archives, and the provincial Community Services department.
 # A precise history would require digging through newspaper archives, and
 # since you didn't say what you wanted, I didn't bother.
 #
 # Saskatchewan is split by a time zone meridian (105W) and over the years
 # the boundary became pretty ragged as communities near it reevaluated
 # their affiliations in one direction or the other.  In 1965 a provincial
 # referendum favoured legislating common time practices.
 #
 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
 # Saskatchewan 1978) was proclaimed, and established that the eastern
 # part of Saskatchewan would use CST year round, that districts in
 # northwest Saskatchewan would by default follow CST but could opt to
 # follow Mountain Time rules (thus 1 hour difference in the winter and
 # zero in the summer), and that districts in southwest Saskatchewan would
 # by default follow MT but could opt to follow CST.
 #
 # It took a few years for the dust to settle (I know one story of a town
 # on one time zone having its school in another, such that a mom had to
 # serve her family lunch in two shifts), but presently it seems that only
 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
 # rules any more; all other districts appear to have used CST year round
 # since sometime in the 1960s.
 
 # From Chris Walton (2006-06-26):
 # The Saskatchewan time act which was last updated in 1996 is about 30 pages
 # long and rather painful to read.
 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Regina	1918	only	-	Apr	14	2:00	1:00	D
 Rule	Regina	1918	only	-	Oct	27	2:00	0	S
 Rule	Regina	1930	1934	-	May	Sun>=1	0:00	1:00	D
 Rule	Regina	1930	1934	-	Oct	Sun>=1	0:00	0	S
 Rule	Regina	1937	1941	-	Apr	Sun>=8	0:00	1:00	D
 Rule	Regina	1937	only	-	Oct	Sun>=8	0:00	0	S
 Rule	Regina	1938	only	-	Oct	Sun>=1	0:00	0	S
 Rule	Regina	1939	1941	-	Oct	Sun>=8	0:00	0	S
 Rule	Regina	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Regina	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Regina	1945	only	-	Sep	lastSun	2:00	0	S
 Rule	Regina	1946	only	-	Apr	Sun>=8	2:00	1:00	D
 Rule	Regina	1946	only	-	Oct	Sun>=8	2:00	0	S
 Rule	Regina	1947	1957	-	Apr	lastSun	2:00	1:00	D
 Rule	Regina	1947	1957	-	Sep	lastSun	2:00	0	S
 Rule	Regina	1959	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Regina	1959	only	-	Oct	lastSun	2:00	0	S
 #
 Rule	Swift	1957	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Swift	1957	only	-	Oct	lastSun	2:00	0	S
 Rule	Swift	1959	1961	-	Apr	lastSun	2:00	1:00	D
 Rule	Swift	1959	only	-	Oct	lastSun	2:00	0	S
 Rule	Swift	1960	1961	-	Sep	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Regina	-6:58:36 -	LMT	1905 Sep
 			-7:00	Regina	M%sT	1960 Apr lastSun  2:00
 			-6:00	-	CST
 Zone America/Swift_Current -7:11:20 -	LMT	1905 Sep
 			-7:00	Canada	M%sT	1946 Apr lastSun  2:00
 			-7:00	Regina	M%sT	1950
 			-7:00	Swift	M%sT	1972 Apr lastSun  2:00
 			-6:00	-	CST
 
 
 # Alberta
 
 # From Alois Treindl (2019-07-19):
 # There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967.
 # 1969, no DST, from Edmonton Journal 18 April 1969
 #
 # From Paul Eggert (2019-07-25):
 # Pearce's book says that Alberta's 1948 Daylight Saving Act required
 # Mountain Standard Time without DST, and that "anyone who broke that law
 # could be fined up to $25 and costs".  There seems to be no record of
 # anybody paying the fine.  The law was not changed until an August 1971
 # plebiscite reinstituted DST in 1972.  This story is also mentioned in:
 # Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017.
 # ISBN 978-1459739123.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Edm	1918	1919	-	Apr	Sun>=8	2:00	1:00	D
 Rule	Edm	1918	only	-	Oct	27	2:00	0	S
 Rule	Edm	1919	only	-	May	27	2:00	0	S
 Rule	Edm	1920	1923	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1920	only	-	Oct	lastSun	2:00	0	S
 Rule	Edm	1921	1923	-	Sep	lastSun	2:00	0	S
 Rule	Edm	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Edm	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Edm	1945	only	-	Sep	lastSun	2:00	0	S
 Rule	Edm	1947	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1947	only	-	Sep	lastSun	2:00	0	S
 Rule	Edm	1972	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1972	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
 			-7:00	Edm	M%sT	1987
 			-7:00	Canada	M%sT
 
 
 # British Columbia
 
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger write that since 1970 most of this region has
 # been like Vancouver.
 # Dawson Creek uses MST.  Much of east BC is like Edmonton.
 
 # From Matt Johnson (2015-09-21):
 # Fort Nelson, BC, Canada will cancel DST this year.  So while previously they
 # were aligned with America/Vancouver, they're now aligned with
 # America/Dawson_Creek.
 # http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html
 #
 # From Tim Parenti (2015-09-23):
 # This requires a new zone for the Northern Rockies Regional Municipality,
 # America/Fort_Nelson.  The resolution of 2014-12-08 was reached following a
 # 2014-11-15 poll with nearly 75% support.  Effectively, the municipality has
 # been on MST (-0700) like Dawson Creek since it advanced its clocks on
 # 2015-03-08.
 #
 # From Paul Eggert (2019-07-25):
 # Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.
 # Alois Treindl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily
 # Province.  He also cited the 1946-09-28 Victoria Daily Times, which said
 # that Vancouver, Victoria, etc. "change at midnight Saturday"; for now,
 # guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver.
 #
 # Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition
 # says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it.
 # http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf
 # A catalog entry for a newspaper clipping seems to indicate that Vancouver
 # observed DST in 1941 from 07-07 through 09-27; see
 # https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941
 # We have no further details, so omit them for now.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Vanc	1918	only	-	Apr	14	2:00	1:00	D
 Rule	Vanc	1918	only	-	Oct	27	2:00	0	S
 Rule	Vanc	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Vanc	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Vanc	1945	only	-	Sep	30	2:00	0	S
 Rule	Vanc	1946	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Vanc	1946	only	-	Sep	29	2:00	0	S
 Rule	Vanc	1947	1961	-	Sep	lastSun	2:00	0	S
 Rule	Vanc	1962	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Vancouver	-8:12:28 -	LMT	1884
 			-8:00	Vanc	P%sT	1987
 			-8:00	Canada	P%sT
 Zone America/Dawson_Creek -8:00:56 -	LMT	1884
 			-8:00	Canada	P%sT	1947
 			-8:00	Vanc	P%sT	1972 Aug 30  2:00
 			-7:00	-	MST
 Zone America/Fort_Nelson	-8:10:47 -	LMT	1884
 			-8:00	Vanc	P%sT	1946
 			-8:00	-	PST	1947
 			-8:00	Vanc	P%sT	1987
 			-8:00	Canada	P%sT	2015 Mar  8  2:00
 			-7:00	-	MST
 # For Creston see America/Phoenix.
 
 # Northwest Territories, Nunavut, Yukon
 
+# From Chris Walton (2022-11-06):
+# Whitehorse Star - Thursday April 22, 1965 - page 1
+# title: DST Starts Monday ...
+# https://www.newspapers.com/image/578587481/
+# The title of this first article is wrong and/or misleading.
+# Also, the start time shown in the  article is vague; it simply says "after
+# midnight" when it probably should have stated 2:00a.m....
+#
+# Whitehorse Star - Monday October 25, 1965 - page 15 ...
+# https://www.newspapers.com/image/578589147/
+# The 1965 Yukon Council minutes can be found here:
+# http://assets.yukonarchives.ca/PER_YG_06_1965_C20_S02_v1.pdf
+# ... I do not currently believe that NWT touched any of its clocks in 1965....
+#
+# Whitehorse Star - Thursday Feb 24,1966 - page 2
+# title: It's Time for YDT ...
+# https://www.newspapers.com/image/578575979/ ...
+# America/Whitehorse as a permanent change from UTC-9(YST) to
+# UTC-8(PST) at 00:00 on Sunday February 27, 1966....
+#
+# Whitehorse Star - Friday April 28,1972 - page 6
+# title: Daylight Saving Time for N.W.T....
+# https://www.newspapers.com/image/578701610/ ...
+# Nunavut and NWT zones ... DST starting in 1972.... Start and End ...
+# should be the same as the rest of Canada
+#
+#
+# From Paul Eggert (2022-11-06):
+# For now, assume Yukon's 1965-04-22 spring forward was 00:00 -> 02:00, as this
+# seems likely than 02:00 -> 04:00 and matches "after midnight".
+
 # From Paul Eggert (2006-03-22):
 # Dawson switched to PST in 1973.  Inuvik switched to MST in 1979.
 # Mathew Englander (1996-10-07) gives the following refs:
 #	* 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
 #	c. 7 defines Yukon standard time as UTC-9....
 #	see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
 #	[https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html]
 #	* C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
 #	* O.I.C. 1980/02 established DST.
 #	* O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
 
 # From Brian Inglis (2015-04-14):
 #
 # I tried to trace the history of Yukon time and found the following
 # regulations, giving the reference title and URL if found, regulation name,
 # and relevant quote if available.  Each regulation specifically revokes its
 # predecessor.  The final reference is to the current Interpretation Act
 # authorizing and resulting from these regulatory changes.
 #
 # Only recent regulations were retrievable via Yukon government site search or
 # index, and only some via Canadian legal sources.  Other sources used include
 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
 # 1970 quoted below; each article includes current extracts from provincial
 # and territorial ST and DST regulations at the end, summaries and details of
 # standard times and daylight saving time at many locations across Canada,
 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
 # and LMST; they also cover many countries and global locations, with a chart
 # and table showing current Universal Time offsets, and may be useful as
 # another source of information for 1970 and earlier.
 #
 # * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
 #   pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
 #   http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
 #   Yukon Interpretation Ordinance
 #   Yukon standard time is the local mean time at the one hundred and
 #   thirty-fifth meridian.
 #
 # * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
 #   JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
 #   (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
 #   Yukon Interpretation Ordinance, 1955, Chap. 16.
 #
 #     (1) Subject to this section, standard time shall be reckoned as nine
 #     hours behind Greenwich Time and called Yukon Standard Time.
 #
 #     (2) Notwithstanding subsection (1), the Commissioner may make regulations
 #     varying the manner of reckoning standard time.
 #
 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
 #   [no online source found]
 #
 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
 #   Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
 #   http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
 #   Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
 #
 #     1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
 #     Territory on 27th January, 1966, is hereby revoked.
 #
 #     2. Yukon (East) Standard Time as defined by section 36 of the
 #     Interpretation Ordinance from and after mid-night on the 28th day of May,
 #     1967 shall be reckoned in the same manner as Pacific Standard Time, that
 #     is to say, eight hours behind Greenwich Time in the area of the Yukon
 #     Territory lying east of the 138th degree longitude west.
 #
 #     3. In the remainder of the Territory, lying west of the 138th degree
 #     longitude west, Yukon (West) Standard Time shall be reckoned as nine
 #     hours behind Greenwich Time.
 #
 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
 #   https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
 #   C.O. 1973/214 INTERPRETATION ACT ...
 #
 #     1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
 #     revoked.
 #
 #     2. Yukon Standard Time as defined by section 36 of the Interpretation
 #     Act from and after midnight on the twenty-eighth day of October, 1973
 #     shall be reckoned in the same manner as Pacific Standard Time, that is
 #     to say eight hours behind Greenwich Time.
 #
 # * O.I.C. 1980/02 INTERPRETATION ACT
 #   https://mm.icann.org/pipermail/tz/attachments/20201125/d5adc93b/CAYTOIC1980-02DST1980-01-04-0001.pdf
 #
 # * Yukon Daylight Saving Time, YOIC 1987/56
 #   https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
 #   O.I.C. 1987/056 INTERPRETATION ACT ...
 #
 #   In every year between
 #     (a) two o'clock in the morning in the first Sunday in April, and
 #     (b) two o'clock in the morning in the last Sunday in October,
 #   Standard Time shall be reckoned as seven hours behind Greenwich Time and
 #   called Yukon Daylight Saving Time.
 #   ...
 #   Dated ... 9th day of March, A.D., 1987.
 #
 # * Yukon Daylight Saving Time 2006, YOIC 2006/127
 #   https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
 #   O.I.C. 2006/127 INTERPRETATION ACT ...
 #
 #     1. In Yukon each year the time for general purposes shall be 7 hours
 #     behind Greenwich mean time during the period commencing at two o'clock
 #     in the forenoon on the second Sunday of March and ending at two o'clock
 #     in the forenoon on the first Sunday of November and shall be called
 #     Yukon Daylight Saving Time.
 #
 #     2. Order-in-Council 1987/56 is revoked.
 #
 #     3. This order comes into force January 1, 2007.
 #
 # * Interpretation Act, RSY 2002, c 125
 # https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
 
+# From Chris Walton (2022-11-06):
+# The 5th edition of the Atlas of Canada contains a time zone map that
+# shows both legislated and observed time zone boundaries.
+# All communities on Baffin Island are shown to be observing Eastern time.
+# The date on the map is 1984.
+# https://ftp.maps.canada.ca/pub/nrcan_rncan/raster/atlas_5_ed/eng/other/referencemaps/mcr4056.pdf
+
 # From Rives McDow (1999-09-04):
 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
 # Nunavut moves to single time zone Oct. 31
 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
 #
 # From Antoine Leca (1999-09-06):
 # We then need to create a new timezone for the Kitikmeot region of Nunavut
 # to differentiate it from the Yellowknife region.
 
 # From Paul Eggert (1999-09-20):
 # Basic Facts: The New Territory
 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
-# (1999) reports that Pangnirtung operates on eastern time,
-# and that Coral Harbour does not observe DST.  We don't know when
-# Pangnirtung switched to eastern time; we'll guess 1995.
-
-# From Rives McDow (1999-11-08):
-# On October 31, when the rest of Nunavut went to Central time,
-# Pangnirtung wobbled.  Here is the result of their wobble:
-#
-# The following businesses and organizations in Pangnirtung use Central Time:
-#
-#	First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
-#	Eastern Arctic National Parks, A & D Specialist
-#
-# The following businesses and organizations in Pangnirtung use Eastern Time:
-#
-#	Hamlet office, All other businesses, Both schools, Airport operator
-#
-# This has made for an interesting situation there, which warranted the news.
-# No one there that I spoke with seems concerned, or has plans to
-# change the local methods of keeping time, as it evidently does not
-# really interfere with any activities or make things difficult locally.
-# They plan to celebrate New Year's turn-over twice, one hour apart,
-# so it appears that the situation will last at least that long.
-# The Nunavut Intergovernmental Affairs hopes that they will "come to
-# their senses", but the locals evidently don't see any problem with
-# the current state of affairs.
-
-# From Michaela Rodrigue, writing in the
-# Nunatsiaq News (1999-11-19):
-# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html
-# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
-# central - or Nunavut time - for government offices, and eastern time
-# for municipal offices and schools....  Igloolik [was similar but then]
-# made the switch to central time on Saturday, Nov. 6.
+# (1999) reports that ... Coral Harbour does not observe DST.
 
 # From Paul Eggert (2000-10-02):
 # Matthews and Vincent (1998) say the following, but we lack histories
 # for these potential new Zones.
 #
 # The Canadian Forces station at Alert uses Eastern Time while the
 # handful of residents at the Eureka weather station [in the Central
 # zone] skip daylight savings.  Baffin Island, which is crossed by the
 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
 # Central Time and Southampton Island [in the Central zone] is not
 # required to use daylight savings.
 
 # From 
 # Nunavut now has two time zones (2000-11-10):
 # The Nunavut government would allow its employees in Kugluktuk and
 # Cambridge Bay to operate on central time year-round, putting them
 # one hour behind the rest of Nunavut for six months during the winter.
 # At the end of October the two communities had rebelled against
 # Nunavut's unified time zone, refusing to shift to eastern time with
 # the rest of the territory for the winter.  Cambridge Bay remained on
 # central time, while Kugluktuk, even farther west, reverted to
 # mountain time, which they had used before the advent of Nunavut's
 # unified time zone in 1999.
 #
 # From Rives McDow (2001-01-20), quoting the Nunavut government:
 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
 
 # From Paul Eggert (2000-12-04):
 # Let's just keep track of the official times for now.
 
 # From Rives McDow (2001-03-07):
 # The premier of Nunavut has issued a ministerial statement advising
 # that effective 2001-04-01, the territory of Nunavut will revert
 # back to three time zones (mountain, central, and eastern).  Of the
 # cities in Nunavut, Coral Harbor is the only one that I know of that
 # has said it will not observe dst, staying on EST year round.  I'm
 # checking for more info, and will get back to you if I come up with
 # more.
 # [Also see  (2001-03-09).]
 
 # From Gwillim Law (2005-05-21):
 # According to ...
 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
 # (from a 1998 Canadian Geographic article), the de facto and de jure time
 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
 # round.  Using Google, it's easy to find other websites that confirm this.
 # I wasn't able to find how far back this time regimen goes, but since it
 # predates the creation of Nunavut, it probably goes back many years....
 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
 #
 # From Paul Eggert (2014-10-17):
 # For lack of better information, assume that Southampton Island observed
 # daylight saving only during wartime.  Gwillim Law's email also
 # mentioned maps now maintained by National Research Council Canada;
 # see above for an up-to-date link.
 
 # From Chris Walton (2007-03-01):
 # ... the community of Resolute (located on Cornwallis Island in
 # Nunavut) moved from Central Time to Eastern Time last November.
 # Basically the community did not change its clocks at the end of
 # daylight saving....
 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
 
 # From Chris Walton (2011-03-21):
 # Back in 2007 I initiated the creation of a new "zone file" for Resolute
 # Bay. Resolute Bay is a small community located about 900km north of
 # the Arctic Circle. The zone file was required because Resolute Bay had
 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
 #
 # According to new information which I received last week, Resolute Bay
 # went back to using UTC-6 in the winter of 2007-2008...
 #
 # On March 11/2007 most of Canada went onto daylight saving. On March
 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
 # talked to somebody that was both knowledgeable and helpful. I was able
 # to confirm that Resolute Bay was still operating on UTC-5. It was
 # explained to me that Resolute Bay had been on the Eastern Time zone
 # (EST) in the winter, and was now back on the Central Time zone (CDT).
 # i.e. the time zone had changed twice in the last year but the clocks
 # had not moved. The residents had to know which time zone they were in
 # so they could follow the correct TV schedule...
 #
 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
 # of the phone call, I decided to seek out an alternate source of
 # information. I found an e-mail address for somebody by the name of
 # Stephanie Adams whose job was listed as "Inns North Support Officer for
 # Arctic Co-operatives." I was under the impression that Stephanie lived
 # and worked in Resolute Bay...
 #
 # On March 14/2011 I phoned the hamlet office again. I was told that
 # Resolute Bay had been using Central Standard Time over the winter of
 # 2010-2011 and that the clocks had therefore been moved one hour ahead
 # on March 13/2011. The person I talked to was aware that Resolute Bay
 # had previously experimented with Eastern Standard Time but he could not
 # tell me when the practice had stopped.
 #
 # On March 17/2011 I searched the Web to find an e-mail address of
 # somebody that might be able to tell me exactly when Resolute Bay went
 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
 # used to be the mayor of Resolute Bay and he apparently owns half the
 # businesses including "South Camp Inn." This website has some info on
 # Aziz:
 # http://www.uphere.ca/node/493
 #
 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
 # Eastern Standard Time.
 #
 # Aziz responded quickly with this: "hi, The time was not changed for the
 # 1 year only, the following year, the community went back to the old way
 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
 # the winter Zulu plus 6 hrs"
 #
 # This of course conflicted with everything I had ascertained in November 2008.
 #
 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
 # may want to check with the weather office in Resolute Bay or do a
 # search on the weather through Env. Canada. web site"
 #
 # If I had realized the Stephanie did not live in Resolute Bay I would
 # never have contacted her.  I now believe that all the information I
 # obtained in November 2008 should be ignored...
 # I apologize for reporting incorrect information in 2008.
 
 # From Tim Parenti (2020-03-05):
 # The government of Yukon announced [yesterday] the cessation of seasonal time
 # changes.  "After clocks are pushed ahead one hour on March 8, the territory
 # will remain on [UTC-07].  ... [The government] found 93 per cent of
 # respondents wanted to end seasonal time changes and, of that group, 70 per
 # cent wanted 'permanent Pacific Daylight Saving Time.'"
 # https://www.cbc.ca/news/canada/north/yukon-end-daylight-saving-time-1.5486358
 #
 # Although the government press release prefers PDT, we prefer MST for
 # consistency with nearby Dawson Creek, Creston, and Fort Nelson.
 # https://yukon.ca/en/news/yukon-end-seasonal-time-change
 
 # From Andrew G. Smith (2020-09-24):
 # Yukon has completed its regulatory change to be on UTC -7 year-round....
 # http://www.gov.yk.ca/legislation/regs/oic2020_125.pdf
 # What we have done is re-defined Yukon Standard Time, as we are
 # authorized to do under section 33 of our Interpretation Act:
 # http://www.gov.yk.ca/legislation/acts/interpretation_c.pdf
 #
 # From Paul Eggert (2020-09-24):
 # tzdb uses the obsolete YST abbreviation for standard time in Yukon through
 # about 1970, and uses PST for standard time in Yukon since then.  Consistent
 # with that, use MST for -07, the new standard time in Yukon effective Nov. 1.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	NT_YK	1918	only	-	Apr	14	2:00	1:00	D
 Rule	NT_YK	1918	only	-	Oct	27	2:00	0	S
 Rule	NT_YK	1919	only	-	May	25	2:00	1:00	D
 Rule	NT_YK	1919	only	-	Nov	 1	0:00	0	S
 Rule	NT_YK	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	NT_YK	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	NT_YK	1945	only	-	Sep	30	2:00	0	S
-Rule	NT_YK	1965	only	-	Apr	lastSun	0:00	2:00	DD
-Rule	NT_YK	1965	only	-	Oct	lastSun	2:00	0	S
-Rule	NT_YK	1980	1986	-	Apr	lastSun	2:00	1:00	D
-Rule	NT_YK	1980	2006	-	Oct	lastSun	2:00	0	S
+Rule	NT_YK	1972	1986	-	Apr	lastSun	2:00	1:00	D
+Rule	NT_YK	1972	2006	-	Oct	lastSun	2:00	0	S
 Rule	NT_YK	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
+Rule	Yukon	1965	only	-	Apr	lastSun	0:00	2:00	DD
+Rule	Yukon	1965	only	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
-# aka Panniqtuuq
-Zone America/Pangnirtung 0	-	-00	1921 # trading post est.
-			-4:00	NT_YK	A%sT	1995 Apr Sun>=1  2:00
-			-5:00	Canada	E%sT	1999 Oct 31  2:00
-			-6:00	Canada	C%sT	2000 Oct 29  2:00
-			-5:00	Canada	E%sT
 # formerly Frobisher Bay
 Zone America/Iqaluit	0	-	-00	1942 Aug # Frobisher Bay est.
 			-5:00	NT_YK	E%sT	1999 Oct 31  2:00
 			-6:00	Canada	C%sT	2000 Oct 29  2:00
 			-5:00	Canada	E%sT
 # aka Qausuittuq
 Zone America/Resolute	0	-	-00	1947 Aug 31 # Resolute founded
 			-6:00	NT_YK	C%sT	2000 Oct 29  2:00
 			-5:00	-	EST	2001 Apr  1  3:00
 			-6:00	Canada	C%sT	2006 Oct 29  2:00
 			-5:00	-	EST	2007 Mar 11  3:00
 			-6:00	Canada	C%sT
 # aka Kangiqiniq
 Zone America/Rankin_Inlet 0	-	-00	1957 # Rankin Inlet founded
 			-6:00	NT_YK	C%sT	2000 Oct 29  2:00
 			-5:00	-	EST	2001 Apr  1  3:00
 			-6:00	Canada	C%sT
 # aka Iqaluktuuttiaq
 Zone America/Cambridge_Bay 0	-	-00	1920 # trading post est.?
 			-7:00	NT_YK	M%sT	1999 Oct 31  2:00
 			-6:00	Canada	C%sT	2000 Oct 29  2:00
 			-5:00	-	EST	2000 Nov  5  0:00
 			-6:00	-	CST	2001 Apr  1  3:00
 			-7:00	Canada	M%sT
 Zone America/Yellowknife 0	-	-00	1935 # Yellowknife founded?
 			-7:00	NT_YK	M%sT	1980
 			-7:00	Canada	M%sT
 Zone America/Inuvik	0	-	-00	1953 # Inuvik founded
 			-8:00	NT_YK	P%sT	1979 Apr lastSun  2:00
 			-7:00	NT_YK	M%sT	1980
 			-7:00	Canada	M%sT
 Zone America/Whitehorse	-9:00:12 -	LMT	1900 Aug 20
-			-9:00	NT_YK	Y%sT	1967 May 28  0:00
-			-8:00	NT_YK	P%sT	1980
+			-9:00	NT_YK	Y%sT	1965
+			-9:00	Yukon	Y%sT	1966 Feb 27  0:00
+			-8:00	-	PST	1980
 			-8:00	Canada	P%sT	2020 Nov  1
 			-7:00	-	MST
 Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20
-			-9:00	NT_YK	Y%sT	1973 Oct 28  0:00
-			-8:00	NT_YK	P%sT	1980
+			-9:00	NT_YK	Y%sT	1965
+			-9:00	Yukon	Y%sT	1973 Oct 28  0:00
+			-8:00	-	PST	1980
 			-8:00	Canada	P%sT	2020 Nov  1
 			-7:00	-	MST
 
 
 ###############################################################################
 
 # Mexico
 
 # From Paul Eggert (2014-12-07):
 # The Investigation and Analysis Service of the
 # Mexican Library of Congress (MLoC) has published a
 # history of Mexican local time (in Spanish)
 # http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm
 #
 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
 # (In all cases we go with the MLoC.)
 # S&P report that Baja was at -8:00 in 1922/1923.
 # S&P say the 1930 transition in Baja was 1930-11-16.
 # S&P report no DST during summer 1931.
 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
 
 # From Gwillim Law (2001-02-20):
 # There are some other discrepancies between the Decrees page and the
 # tz database.  I think they can best be explained by supposing that
 # the researchers who prepared the Decrees page failed to find some of
 # the relevant documents.
 
 # From Alan Perry (1996-02-15):
 # A guy from our Mexico subsidiary finally found the Presidential Decree
 # outlining the timezone changes in Mexico.
 #
 # ------------- Begin Forwarded Message -------------
 #
 # I finally got my hands on the Official Presidential Decree that sets up the
 # rules for the DST changes. The rules are:
 #
 # 1. The country is divided in 3 timezones:
 #    - Baja California Norte (the Mexico/BajaNorte TZ)
 #    - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
 #    - The rest of the country (the Mexico/General TZ)
 #
 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
 #    at 2:00 AM, the times in each zone are as follows:
 #    BajaNorte: GMT+7
 #    BajaSur:   GMT+6
 #    General:   GMT+5
 #
 # 3. The rest of the year, the times are as follows:
 #    BajaNorte: GMT+8
 #    BajaSur:   GMT+7
 #    General:   GMT+6
 #
 # The Decree was published in Mexico's Official Newspaper on January 4th.
 #
 # -------------- End Forwarded Message --------------
 # From Paul Eggert (1996-06-12):
 # For an English translation of the decree, see
 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
 # http://mexico-travel.com/extra/timezone_eng.html
 
 # From Rives McDow (1998-10-08):
 # The State of Quintana Roo has reverted back to central STD and DST times
 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
 
 # From Rives McDow (2000-01-10):
 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
 # zone 5 hours from the International Date Line, and will not observe daylight
 # savings time so as to stay on the same time zone as the southern part of
 # Arizona year round.
 
 # From Jesper Nørgaard, translating
 #  (2001-01-17):
 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
 # Syndicate of Education Workers, refuse to apply daylight saving each
 # year, so that the more than 10,000 schools work at normal hour the
 # whole year.
 
 # From Gwillim Law (2001-01-19):
 #  ... says
 # (translated):...
 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
 # that Summer Time will be reduced from seven to five months, starting
 # this year....
 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
 # [translated], says "summer time will ... take effect on the first Sunday
 # in May, and end on the last Sunday of September.
 
 # From Arthur David Olson (2001-01-25):
 # The 2001-01-24 traditional Washington Post contained the page one
 # story "Timely Issue Divides Mexicans."...
 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
 # ... Mexico City Mayor López Obrador "...is threatening to keep
 # Mexico City and its 20 million residents on a different time than
 # the rest of the country..." In particular, López Obrador would abolish
 # observation of Daylight Saving Time.
 
 # Official statute published by the Energy Department
 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
 # and Sonora with no DST.  This was reported by Jesper Nørgaard (2001-02-03).
 
 # From Paul Eggert (2001-03-03):
 #
 # https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html
 # James F. Smith writes in today's LA Times
 # * Sonora will continue to observe standard time.
 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
 #   the Federal District will not adopt DST.
 # * 4 of 16 district leaders announced they'll ignore the decree.
 # * The decree does not affect federal-controlled facilities including
 #   the airport, banks, hospitals, and schools.
 #
 # For now we'll assume that the Federal District will bow to federal rules.
 
 # From Jesper Nørgaard (2001-04-01):
 # I found some references to the Mexican application of daylight
 # saving, which modifies what I had already sent you, stating earlier
 # that a number of northern Mexican states would go on daylight
 # saving. The modification reverts this to only cover Baja California
 # (Norte), while all other states (except Sonora, who has no daylight
 # saving all year) will follow the original decree of president
 # Vicente Fox, starting daylight saving May 6, 2001 and ending
 # September 30, 2001.
 # References: "Diario de Monterrey" 
 # Palabra  (2001-03-31)
 
 # From Reuters (2001-09-04):
 # Mexico's Supreme Court on Tuesday declared that daylight savings was
 # unconstitutional in Mexico City, creating the possibility the
 # capital will be in a different time zone from the rest of the nation
 # next year....  The Supreme Court's ruling takes effect at 2:00
 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
 # standard time. "This is so residents of the Federal District are not
 # subject to unexpected time changes," a statement from the court said.
 
 # From Jesper Nørgaard Welen (2002-03-12):
 # ... consulting my local grocery store(!) and my coworkers, they all insisted
 # that a new decision had been made to reinstate US style DST in Mexico....
 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
 # confirms this.  Sonora as usual is the only state where DST is not applied.
 
 # From Steffen Thorsen (2009-12-28):
 #
 # Steffen Thorsen wrote:
 # > Mexico's House of Representatives has approved a proposal for northern
 # > Mexico's border cities to share the same daylight saving schedule as
 # > the United States.
 # Now this has passed both the Congress and the Senate, so starting from
 # 2010, some border regions will be the same:
 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
 # (Spanish)
 #
 # Could not find the new law text, but the proposed law text changes are here:
 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
 # (Gaceta Parlamentaria)
 #
 # There is also a list of the votes here:
 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
 #
 # Our page:
 # https://www.timeanddate.com/news/time/north-mexico-dst-change.html
 
 # From Arthur David Olson (2010-01-20):
 # The page
 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
 # includes this text:
 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
 # horas del primer domingo de noviembre.
 # En los municipios fronterizos que se encuentren ubicados en la franja
 # fronteriza norte en el territorio comprendido entre la línea
 # internacional y la línea paralela ubicada a una distancia de veinte
 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
 # interior del país, la aplicación de este horario estacional surtirá
 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
 # las dos horas del primer domingo de noviembre.
 
 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
 # The Mexican state of Quintana Roo will likely change to EST in 2015.
 #
 # http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
 # "With this change, the time conflict that has existed between the municipios
 # of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
 # end. The latter declared itself in rebellion 15 years ago when a time change
 # was initiated in Mexico, and since then it has refused to change its time
 # zone along with the rest of the country."
 #
 # From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
 # http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
 # "...the new time zone will come into effect at two o'clock on the first Sunday
 # of February, when we will have to advance the clock one hour from its current
 # time..."
 # Also, the new zone will not use DST.
 #
 # From Carlos Raúl Perasso (2015-02-02):
 # The decree that modifies the Mexican Hour System Law has finally
 # been published at the Diario Oficial de la Federación
 # http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015
 # It establishes 5 zones for Mexico:
 # 1- Zona Centro (Central Zone): Corresponds to longitude 90 W,
 #    includes most of Mexico, excluding what's mentioned below.
 # 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the
 #    states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía
 #    de Banderas which lies in Central Zone); Sinaloa and Sonora.
 # 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the
 #    state of Baja California.
 # 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state
 #    of Quintana Roo.
 # 5- The islands, reefs and keys shall take their timezone from the
 #    longitude they are located at.
 
 # From Paul Eggert (2022-10-28):
 # The new Mexican law was published today:
 # https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022
 # This abolishes DST except where US DST rules are observed,
 # and in addition changes all of Chihuahua to -06 with no DST.
 
+# From Heitor David Pinto (2022-11-28):
+# Now the northern municipalities want to have the same time zone as the
+# respective neighboring cities in the US, for example Juárez in UTC-7 with
+# DST, matching El Paso, and Ojinaga in UTC-6 with DST, matching Presidio....
+# the president authorized the publication of the decree for November 29,
+# so the time change would occur on November 30 at 0:00.
+# http://puentelibre.mx/noticia/ciudad_juarez_cambio_horario_noviembre_2022/
+
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Mexico	1931	only	-	May	1	23:00	1:00	D
 Rule	Mexico	1931	only	-	Oct	1	0:00	0	S
 Rule	Mexico	1939	only	-	Feb	5	0:00	1:00	D
 Rule	Mexico	1939	only	-	Jun	25	0:00	0	S
 Rule	Mexico	1940	only	-	Dec	9	0:00	1:00	D
 Rule	Mexico	1941	only	-	Apr	1	0:00	0	S
 Rule	Mexico	1943	only	-	Dec	16	0:00	1:00	W # War
 Rule	Mexico	1944	only	-	May	1	0:00	0	S
 Rule	Mexico	1950	only	-	Feb	12	0:00	1:00	D
 Rule	Mexico	1950	only	-	Jul	30	0:00	0	S
 Rule	Mexico	1996	2000	-	Apr	Sun>=1	2:00	1:00	D
 Rule	Mexico	1996	2000	-	Oct	lastSun	2:00	0	S
 Rule	Mexico	2001	only	-	May	Sun>=1	2:00	1:00	D
 Rule	Mexico	2001	only	-	Sep	lastSun	2:00	0	S
 Rule	Mexico	2002	2022	-	Apr	Sun>=1	2:00	1:00	D
 Rule	Mexico	2002	2022	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 # Quintana Roo; represented by Cancún
 Zone America/Cancun	-5:47:04 -	LMT	1922 Jan  1  6:00u
 			-6:00	-	CST	1981 Dec 23
 			-5:00	Mexico	E%sT	1998 Aug  2  2:00
 			-6:00	Mexico	C%sT	2015 Feb  1  2:00
 			-5:00	-	EST
 # Campeche, Yucatán; represented by Mérida
 Zone America/Merida	-5:58:28 -	LMT	1922 Jan  1  6:00u
 			-6:00	-	CST	1981 Dec 23
 			-5:00	-	EST	1982 Dec  2
 			-6:00	Mexico	C%sT
 # Coahuila, Nuevo León, Tamaulipas (near US border)
 # This includes the following municipalities:
-#   in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava,
-#     Guerrero, Hidalgo.
-#   in Nuevo León: Anáhuac, Los Aldama.
+#   in Coahuila: Acuña, Allende, Guerrero, Hidalgo, Jiménez, Morelos, Nava,
+#     Ocampo, Piedras Negras, Villa Unión, Zaragoza
+#   in Nuevo León: Anáhuac
 #   in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo,
 #     Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros.
-# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal,
-# 2016-03-12
-# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza
+# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022
 Zone America/Matamoros	-6:30:00 -	LMT	1922 Jan  1  6:00u
 			-6:00	-	CST	1988
 			-6:00	US	C%sT	1989
 			-6:00	Mexico	C%sT	2010
 			-6:00	US	C%sT
 # Durango; Coahuila, Nuevo León, Tamaulipas (away from US border)
 Zone America/Monterrey	-6:41:16 -	LMT	1922 Jan  1  6:00u
 			-6:00	-	CST	1988
 			-6:00	US	C%sT	1989
 			-6:00	Mexico	C%sT
 # Central Mexico
 Zone America/Mexico_City -6:36:36 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
 			-7:00	Mexico	M%sT	1932 Apr  1
 			-6:00	Mexico	C%sT	2001 Sep 30  2:00
 			-6:00	-	CST	2002 Feb 20
 			-6:00	Mexico	C%sT
-# Chihuahua (near US border)
+# Chihuahua (near US border - western side)
 # This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe,
-# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides.
-# (See the 2016-03-12 El Universal source mentioned above.)
+# and Práxedis G Guerrero.
+# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf
+Zone America/Ciudad_Juarez -7:05:56 -	LMT	1922 Jan  1  7:00u
+			-7:00	-	MST	1927 Jun 10 23:00
+			-6:00	-	CST	1930 Nov 15
+			-7:00	Mexico	M%sT	1932 Apr  1
+			-6:00	-	CST	1996
+			-6:00	Mexico	C%sT	1998
+			-6:00	-	CST	1998 Apr Sun>=1  3:00
+			-7:00	Mexico	M%sT	2010
+			-7:00	US	M%sT	2022 Oct 30  2:00
+			-6:00	-	CST	2022 Nov 30  0:00
+			-7:00	US	M%sT
+# Chihuahua (near US border - eastern side)
+# The municipalities of Coyame del Sotol, Ojinaga, and Manuel Benavides.
+# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf
 Zone America/Ojinaga	-6:57:40 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
 			-7:00	Mexico	M%sT	1932 Apr  1
 			-6:00	-	CST	1996
 			-6:00	Mexico	C%sT	1998
 			-6:00	-	CST	1998 Apr Sun>=1  3:00
 			-7:00	Mexico	M%sT	2010
 			-7:00	US	M%sT	2022 Oct 30  2:00
-			-6:00	-	CST
+			-6:00	-	CST	2022 Nov 30  0:00
+			-6:00	US	C%sT
 # Chihuahua (away from US border)
 Zone America/Chihuahua	-7:04:20 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
 			-7:00	Mexico	M%sT	1932 Apr  1
 			-6:00	-	CST	1996
 			-6:00	Mexico	C%sT	1998
 			-6:00	-	CST	1998 Apr Sun>=1  3:00
 			-7:00	Mexico	M%sT	2022 Oct 30  2:00
 			-6:00	-	CST
 # Sonora
 Zone America/Hermosillo	-7:23:52 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
 			-7:00	Mexico	M%sT	1932 Apr  1
 			-6:00	-	CST	1942 Apr 24
 			-7:00	-	MST	1949 Jan 14
 			-8:00	-	PST	1970
 			-7:00	Mexico	M%sT	1999
 			-7:00	-	MST
 
+# Baja California Sur, Nayarit (except Bahía de Banderas), Sinaloa
+Zone America/Mazatlan	-7:05:40 -	LMT	1922 Jan  1  7:00u
+			-7:00	-	MST	1927 Jun 10 23:00
+			-6:00	-	CST	1930 Nov 15
+			-7:00	Mexico	M%sT	1932 Apr  1
+			-6:00	-	CST	1942 Apr 24
+			-7:00	-	MST	1949 Jan 14
+			-8:00	-	PST	1970
+			-7:00	Mexico	M%sT
+
+# Bahía de Banderas
+
 # From Alexander Krivenyshev (2010-04-21):
 # According to news, Bahía de Banderas (Mexican state of Nayarit)
 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
 #
 # (Spanish)
 # Bahía de Banderas homologa su horario al del centro del
 # país, a partir de este domingo
 # http://www.nayarit.gob.mx/notes.asp?id=20748
 #
 # Bahía de Banderas homologa su horario con el del Centro del
 # País
 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50
 #
 # (English)
 # Puerto Vallarta and Bahía de Banderas: One Time Zone
 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
 #
 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
 # zone ..."
 # Baja California Sur, Nayarit, Sinaloa
 
 # From Arthur David Olson (2010-05-01):
 # Use "Bahia_Banderas" to keep the name to fourteen characters.
 
-# Mazatlán
-Zone America/Mazatlan	-7:05:40 -	LMT	1922 Jan  1  7:00u
-			-7:00	-	MST	1927 Jun 10 23:00
-			-6:00	-	CST	1930 Nov 15
-			-7:00	Mexico	M%sT	1932 Apr  1
-			-6:00	-	CST	1942 Apr 24
-			-7:00	-	MST	1949 Jan 14
-			-8:00	-	PST	1970
-			-7:00	Mexico	M%sT
-
-# Bahía de Banderas
 Zone America/Bahia_Banderas -7:01:00 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
 			-7:00	Mexico	M%sT	1932 Apr  1
 			-6:00	-	CST	1942 Apr 24
 			-7:00	-	MST	1949 Jan 14
 			-8:00	-	PST	1970
 			-7:00	Mexico	M%sT	2010 Apr  4  2:00
 			-6:00	Mexico	C%sT
 
 # Baja California
 Zone America/Tijuana	-7:48:04 -	LMT	1922 Jan  1  7:00u
 			-7:00	-	MST	1924
 			-8:00	-	PST	1927 Jun 10 23:00
 			-7:00	-	MST	1930 Nov 15
 			-8:00	-	PST	1931 Apr  1
 			-8:00	1:00	PDT	1931 Sep 30
 			-8:00	-	PST	1942 Apr 24
 			-8:00	1:00	PWT	1945 Aug 14 23:00u
 			-8:00	1:00	PPT	1945 Nov 12 # Peace
 			-8:00	-	PST	1948 Apr  5
 			-8:00	1:00	PDT	1949 Jan 14
 			-8:00	-	PST	1954
 			-8:00	CA	P%sT	1961
 			-8:00	-	PST	1976
 			-8:00	US	P%sT	1996
 			-8:00	Mexico	P%sT	2001
 			-8:00	US	P%sT	2002 Feb 20
 			-8:00	Mexico	P%sT	2010
 			-8:00	US	P%sT
 # From Paul Eggert (2006-03-22):
 # Formerly there was an America/Ensenada zone, which differed from
 # America/Tijuana only in that it did not observe DST from 1976
 # through 1995.  This was as per Shanks (1999).  But Shanks & Pottenger say
 # Ensenada did not observe DST from 1948 through 1975.  Guy Harris reports
 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
 # DST-observance was a town-by-town matter back then.  This concerns
 # data after 1970 so most likely there should be at least one Zone
 # other than America/Tijuana for Baja, but it's not clear yet what its
 # name or contents should be.
 #
 # From Paul Eggert (2015-10-08):
 # Formerly there was an America/Santa_Isabel zone, but this appears to
 # have come from a misreading of
 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
 # It has been moved to the 'backward' file.
 #
 # From Paul Eggert (2022-10-28):
 # Today's new law states that the entire state of Baja California
 # follows US DST rules, which agrees with simplifications noted above.
 #
 #
 # Revillagigedo Is
 # no information
 
 ###############################################################################
 
 # Barbados
 
 # For 1899 Milne gives -3:58:29.2.
 
 # From P Chan (2020-12-09 and 2020-12-11):
 # Standard time of GMT-4 was adopted in 1911.
 # Definition of Time Act, 1911 (1911-7) [1911-08-28]
 # 1912, Laws of Barbados (5 v.), OCLC Number: 919801291, Vol. 4, Image No. 522
 # 1944, Laws of Barbados (5 v.), OCLC Number: 84548697, Vol. 4, Image No. 122
 # http://llmc.com/browse.aspx?type=2&coll=85&div=297
 #
 # DST was observed in 1942-44.
 # Defence (Daylight Saving) Regulations, 1942, 1942-04-13
 # Defence (Daylight Saving) (Repeal) Regulations, 1942, 1942-08-22
 # Defence (Daylight Saving) Regulations, 1943, 1943-04-16
 # Defence (Daylight Saving) (Repeal) Regulations, 1943, 1943-09-01
 # Defence (Daylight Saving) Regulations, 1944, 1944-03-21
 # [Defence (Daylight Saving) (Amendment) Regulations 1944, 1944-03-28]
 # Defence (Daylight Saving) (Repeal) Regulations, 1944, 1944-08-30
 #
 # 1914-, Subsidiary Legis., Annual Vols. OCLC Number: 226290591
 # 1942: Image Nos. 527-528, 555-556
 # 1943: Image Nos. 178-179, 198
 # 1944: Image Nos. 113-115, 129
 # http://llmc.com/titledescfull.aspx?type=2&coll=85&div=297&set=98437
 #
 # From Tim Parenti (2021-02-20):
 # The transitions below are derived from P Chan's sources, except that the 1977
 # through 1980 transitions are from Shanks & Pottenger since we have no better
 # data there.  Of particular note, the 1944 DST regulation only advanced the
 # time to "exactly three and a half hours later than Greenwich mean time", as
 # opposed to "three hours" in the 1942 and 1943 regulations.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Barb	1942	only	-	Apr	19	5:00u	1:00	D
 Rule	Barb	1942	only	-	Aug	31	6:00u	0	S
 Rule	Barb	1943	only	-	May	 2	5:00u	1:00	D
 Rule	Barb	1943	only	-	Sep	 5	6:00u	0	S
 Rule	Barb	1944	only	-	Apr	10	5:00u	0:30	-
 Rule	Barb	1944	only	-	Sep	10	6:00u	0	S
 Rule	Barb	1977	only	-	Jun	12	2:00	1:00	D
 Rule	Barb	1977	1978	-	Oct	Sun>=1	2:00	0	S
 Rule	Barb	1978	1980	-	Apr	Sun>=15	2:00	1:00	D
 Rule	Barb	1979	only	-	Sep	30	2:00	0	S
 Rule	Barb	1980	only	-	Sep	25	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-3:58:29.2
 Zone America/Barbados	-3:58:29 -	LMT	1911 Aug 28 # Bridgetown
 			-4:00	Barb	A%sT	1944
 			-4:00	Barb	AST/-0330 1945
 			-4:00	Barb	A%sT
 
 # Belize
 
 # From P Chan (2020-11-03):
 # Below are some laws related to the time in British Honduras/Belize:
 #
 # Definition of Time Ordinance, 1927 (No.4 of 1927) [1927-04-01]
 # Ordinances of British Honduras Passed in the Year 1927, p 19-20
 # https://books.google.com/books?id=LqEpAQAAMAAJ&pg=RA3-PA19
 #
 # Definition of Time (Amendment) Ordinance, 1942 (No. 5 of 1942) [1942-06-27]
 # Ordinances of British Honduras Passed in the Year 1942, p 31-32
 # https://books.google.com/books?id=h6MpAQAAMAAJ&pg=RA6-PA95-IA44
 #
 # Definition of Time Ordinance, 1945 (No. 19 of 1945) [1945-12-15]
 # Ordinances of British Honduras Passed in the Year 1945, p 49-50
 # https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA2-PP1
 #
 # Definition of Time Ordinance, 1947 (No. 1 of 1947) [1947-03-11]
 # Ordinances of British Honduras Passed in the Year 1947, p 1-2
 # https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA3-PA1
 #
 # Time (Definition of) Ordinance  (Chapter 180)
 # The Laws of British Honduras in Force on the 15th Day of September, 1958 , Volume IV, p 2580
 # https://books.google.com/books?id=v5QpAQAAMAAJ&pg=PA2580
 #
 # Time (Definition of) (Amendment) Ordinance, 1968 (No. 13 of 1968) [1968-08-03]
 # https://books.google.com/books?id=xij7KEB_58wC&pg=RA1-PA428-IA9
 #
 # Definition of Time Act (Chapter 339)
 # Law of Belize, Revised Edition 2000
 # http://www.belizelaw.org/web/lawadmin/PDF%20files/cap339.pdf
 
 # From Paul Eggert (2020-11-03):
 # The transitions below are derived from P Chan's sources, except that the
 # 1973 through 1983 transitions are from Shanks & Pottenger since we have
 # no better data there.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Belize	1918	1941	-	Oct	Sat>=1	24:00	0:30	-0530
 Rule	Belize	1919	1942	-	Feb	Sat>=8	24:00	0	CST
 Rule	Belize	1942	only	-	Jun	27	24:00	1:00	CWT
 Rule	Belize	1945	only	-	Aug	14	23:00u	1:00	CPT
 Rule	Belize	1945	only	-	Dec	15	24:00	0	CST
 Rule	Belize	1947	1967	-	Oct	Sat>=1	24:00	0:30	-0530
 Rule	Belize	1948	1968	-	Feb	Sat>=8	24:00	0	CST
 Rule	Belize	1973	only	-	Dec	 5	0:00	1:00	CDT
 Rule	Belize	1974	only	-	Feb	 9	0:00	0	CST
 Rule	Belize	1982	only	-	Dec	18	0:00	1:00	CDT
 Rule	Belize	1983	only	-	Feb	12	0:00	0	CST
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Belize	-5:52:48 -	LMT	1912 Apr  1
 			-6:00	Belize	%s
 
 # Bermuda
 
 # From Paul Eggert (2022-07-27):
 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
 # Bermuda dockyard, Ireland I.  This agrees with standard offset given in the
 # Daylight Saving Act, 1917 cited below.
 # It is not known when this time became standard for Bermuda; guess 1890.
 # The transition to -04 was specified by:
 # 1930: The Time Zone Act, 1929 (1929: No. 39) [1929-11-08]
 # https://books.google.com/books?id=7tdMAQAAIAAJ&pg=RA54-PP1
 
 # From P Chan (2020-11-20):
 # Most of the information can be found online from the Bermuda National
 # Library - Digital Collection which includes The Royal Gazette (RG) until 1957
 # https://bnl.contentdm.oclc.org/digital/
 # I will cite the ID.  For example, [10000] means
 # https://bnl.contentdm.oclc.org/digital/collection/BermudaNP02/id/10000
 #
 # 1917: Apr 5 midnight to Sep 30 midnight
 # Daylight Saving Act, 1917 (1917 No. 13) [1917-04-02]
 # Bermuda Acts and Resolves 1917, p 37-38
 # https://books.google.com/books?id=M-lCAQAAMAAJ&pg=PA36-IA2
 # RG, 1917-04-04, p 6 [42340] gives the spring forward date.
 #
 # 1918: Apr 13 midnight to Sep 15 midnight
 # Daylight Saving Act, 1918 (1918 No. 9) [1918-04-06]
 # Bermuda Acts and Resolves 1917, p 13
 # https://books.google.com/books?id=K-lCAQAAMAAJ&pg=RA1-PA7
 #
 # Note that local mean time was still used before 1930.
 #
 # During WWII, DST was introduced by Defence Regulations
 # 1942: Jan 11 02:00 to Oct 18 02:00 [113646], [115726]
 # 1943: Mar 21 02:00 to Oct 31 02:00 [116704], [118193]
 # 1944: Mar 12 02:00 to Nov 5 02:00 [119225], [121593]
 # 1945: Mar 11 02:00 to Nov 4 02:00 [122369], [124461]
 # RG, 1942-01-08, p 2, 1942-10-12, p 2 , 1943-03-06, p 2, 1943-09-03, p 1,
 # 1944-02-29, p 6, 1944-09-20, p 2, 1945-02-13, p 2, 1945-11-03, p 1
 #
 # In 1946, the House of Assembly rejected DST twice. [128686], [128076]
 # RG, 1946-03-16 p 1,1946-04-13 p 1
 #
 # 1947: third Sunday in May 02:00 to second Sunday in September 02:00
 # DST in 1947 was defined in the Daylight Saving Act, 1947 (1947: No. 12)
 # which expired at the end of the year.  [125784] ,[132405], [144454], [138226]
 # RG, 1947-02-27, p 1, 1947-05-15, p 1, 1947-09-13, p 1, 1947-12-30, p 1
 #
 # 1948-1952: fourth Sunday in May 02:00 to first Sunday in September 02:00
 # DST in 1948 was defined in the Daylight Saving Act, 1948 (1948 : No. 12)
 # which was set to expired at the end of the year but it was extended until
 # the end of 1952 and was not further extended.
 # [129802], [139403], [146008], [135240], [144330], [139049], [143309],
 # [148271], [149773], [153589], [153802], [155924]
 # RG, 1948-04-13, p 1, 1948-05-22, p 1, 1948-09-04, p 1, 1949-05-21, p1,
 # 1949-09-03, p 1, 1950-05-27 p 1, 1950-09-02, p 1, 1951-05-27, p 1,
 # 1951-09-01, p 1, 1952-05-23, p 1, 1952-09-26, p 1, 1952-12-21, p 8
 #
 # In 1953-1955, the House of Assembly rejected DST each year. [158996],
 # [162620], [166720] RG, 1953-05-02, p 1, 1954-04-01 p 1, 1955-03-12, p 1
 #
 # 1956: fourth Sunday in May 02:00 to last Sunday in October 02:00
 # Time Zone (Seasonal Variation) Act, 1956 (1956: No.44) [1956-05-25]
 # Bermuda Public Acts 1956, p 331-332
 # https://books.google.com/books?id=Xs1AlmD_cEwC&pg=PA63
 #
 # The extension of the Act was rejected by the House of Assembly. [176218]
 # RG, 1956-12-13, p 1
 #
 # From the Chronological Table of Public and Private Acts up to 1985, it seems
 # that there does not exist other Acts related to DST before 1973.
 # https://books.google.com/books?id=r9hMAQAAIAAJ&pg=RA23-PA1
 # Public Acts of the Legislature of the Islands of Bermuda, Together with
 # Statutory Instruments in Force Thereunder, Vol VII
 
 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
 # Next year, however, clocks in the US will go forward on the second Sunday
 # in March, until the first Sunday in November.  And, after the Time Zone
 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
 # Friday, the same thing will happen in Bermuda.
 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Bermuda	1917	only	-	Apr	 5	24:00	1:00	-
 Rule	Bermuda	1917	only	-	Sep	30	24:00	0	-
 Rule	Bermuda	1918	only	-	Apr	13	24:00	1:00	-
 Rule	Bermuda	1918	only	-	Sep	15	24:00	0	S
 Rule	Bermuda	1942	only	-	Jan	11	 2:00	1:00	D
 Rule	Bermuda	1942	only	-	Oct	18	 2:00	0	S
 Rule	Bermuda	1943	only	-	Mar	21	 2:00	1:00	D
 Rule	Bermuda	1943	only	-	Oct	31	 2:00	0	S
 Rule	Bermuda	1944	1945	-	Mar	Sun>=8	 2:00	1:00	D
 Rule	Bermuda	1944	1945	-	Nov	Sun>=1	 2:00	0	S
 Rule	Bermuda	1947	only	-	May	Sun>=15	 2:00	1:00	D
 Rule	Bermuda	1947	only	-	Sep	Sun>=8	 2:00	0	S
 Rule	Bermuda	1948	1952	-	May	Sun>=22	 2:00	1:00	D
 Rule	Bermuda	1948	1952	-	Sep	Sun>=1	 2:00	0	S
 Rule	Bermuda	1956	only	-	May	Sun>=22	 2:00	1:00	D
 Rule	Bermuda	1956	only	-	Oct	lastSun	 2:00	0	S
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-4:19:18.3
 Zone Atlantic/Bermuda	-4:19:18 -	LMT	1890	# Hamilton
 			-4:19:18 Bermuda BMT/BST 1930 Jan 1  2:00
 			-4:00	Bermuda	A%sT	1974 Apr 28  2:00
 			-4:00	Canada	A%sT	1976
 			-4:00	US	A%sT
 
 # Costa Rica
 
 # Milne gives -5:36:13.3 as San José mean time.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	CR	1979	1980	-	Feb	lastSun	0:00	1:00	D
 Rule	CR	1979	1980	-	Jun	Sun>=1	0:00	0	S
 Rule	CR	1991	1992	-	Jan	Sat>=15	0:00	1:00	D
 # IATA SSIM (1991-09) says the following was at 1:00;
 # go with Shanks & Pottenger.
 Rule	CR	1991	only	-	Jul	 1	0:00	0	S
 Rule	CR	1992	only	-	Mar	15	0:00	0	S
 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-5:36:13.3
 Zone America/Costa_Rica	-5:36:13 -	LMT	1890        # San José
 			-5:36:13 -	SJMT	1921 Jan 15 # San José Mean Time
 			-6:00	CR	C%sT
 # Coco
 # no information; probably like America/Costa_Rica
 
 # Cuba
 
 # From Paul Eggert (2013-02-21):
 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
 # for the port, and -5:30 for meteorological observations.
 # For now, stick with Shanks & Pottenger.
 
 # From Arthur David Olson (1999-03-29):
 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
 # the Cuban National Team and the Baltimore Orioles was carried live on
 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
 # During the game, play-by-play announcer Jim Hunter noted that
 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
 # Time today."  (The "two hour" remark referred to losing one hour of
 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched
 # to DST - and one more hour on 1999-04-04 - when the announcers will have
 # returned to Baltimore, which switches on that date.)
 
 # From Steffen Thorsen (2013-11-11):
 # DST start in Cuba in 2004 ... does not follow the same rules as the
 # years before.  The correct date should be Sunday 2004-03-28 00:00 ...
 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
 
 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
 # Cuba is not going back to standard time this year.
 # From Paul Eggert (2006-03-22):
 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
 # says that it's due to a problem at the Antonio Guiteras
 # thermoelectric plant, and says "This October there will be no return
 # to normal hours (after daylight saving time)".
 # For now, let's assume that it's a temporary measure.
 
 # From Carlos A. Carnero Delgado (2005-11-12):
 # This year (just like in 2004-2005) there's no change in time zone
 # adjustment in Cuba.  We will stay in daylight saving time:
 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
 
 # From Jesper Nørgaard Welen (2006-10-21):
 # An article in GRANMA INTERNACIONAL claims that Cuba will end
 # the 3 years of permanent DST next weekend, see
 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
 # watches should be set back one hour - going back to 00:00 hours - returning
 # to the normal schedule....
 
 # From Paul Eggert (2007-03-02):
 # , dated yesterday,
 # says Cuban clocks will advance at midnight on March 10.
 # For lack of better information, assume Cuba will use US rules,
 # except that it switches at midnight standard time as usual.
 #
 # From Steffen Thorsen (2007-10-25):
 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
 # earlier - on the last Sunday of October, just like in 2006.
 #
 # He supplied these references:
 #
 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
 #
 # From Alex Krivenyshev (2007-10-25):
 # Here is also article from Granma (Cuba):
 #
 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
 #
 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
 
 # From Arthur David Olson (2008-03-09):
 # I'm in Maryland which is now observing United States Eastern Daylight
 # Time. At 9:44 local time I used RealPlayer to listen to
 # http://media.enet.cu/radioreloj
 # a Cuban information station, and heard
 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
 # indicating that Cuba is still on standard time.
 
 # From Steffen Thorsen (2008-03-12):
 # It seems that Cuba will start DST on Sunday, 2007-03-16...
 # It was announced yesterday, according to this source (in Spanish):
 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
 #
 # Some more background information is posted here:
 # https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
 #
 # The article also says that Cuba has been observing DST since 1963,
 # while Shanks (and tzdata) has 1965 as the first date (except in the
 # 1940's). Many other web pages in Cuba also claim that it has been
 # observed since 1963, but with the exception of 1970 - an exception
 # which is not present in tzdata/Shanks. So there is a chance we need to
 # change some historic records as well.
 #
 # One example:
 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
 
 # From Jesper Nørgaard Welen (2008-03-13):
 # The Cuban time change has just been confirmed on the most authoritative
 # web site, the Granma.  Please check out
 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
 #
 # Basically as expected after Steffen Thorsen's information, the change
 # will take place midnight between Saturday and Sunday.
 
 # From Arthur David Olson (2008-03-12):
 # Assume Sun>=15 (third Sunday) going forward.
 
 # From Alexander Krivenyshev (2009-03-04)
 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
 # not on midnight March 14 / March 15 as previously thought.
 #
 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
 # (in Spanish)
 
 # From Arthur David Olson (2009-03-09)
 # I listened over the Internet to
 # http://media.enet.cu/readioreloj
 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
 # the time was announced as "diez cinco" - the same time as here, indicating
 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
 
 # From Steffen Thorsen (2011-03-08):
 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
 # this year. Nothing about the end date known so far (if that has
 # changed at all).
 #
 # Source:
 # http://granma.co.cu/2011/03/08/nacional/artic01.html
 #
 # Our info:
 # https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
 #
 # From Steffen Thorsen (2011-10-30)
 # Cuba will end DST two weeks later this year. Instead of going back
 # tonight, it has been delayed to 2011-11-13 at 01:00.
 #
 # One source (Spanish)
 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
 #
 # Our page:
 # https://www.timeanddate.com/news/time/cuba-time-changes-2011.html
 #
 # From Steffen Thorsen (2012-03-01)
 # According to Radio Reloj, Cuba will start DST on Midnight between March
 # 31 and April 1.
 #
 # Radio Reloj has the following info (Spanish):
 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
 #
 # Our info on it:
 # https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
 
 # From Steffen Thorsen (2012-11-03):
 # Radio Reloj and many other sources report that Cuba is changing back
 # to standard time on 2012-11-04:
 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
 # From Paul Eggert (2012-11-03):
 # For now, assume the future rule is first Sunday in November.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Cuba	1928	only	-	Jun	10	0:00	1:00	D
 Rule	Cuba	1928	only	-	Oct	10	0:00	0	S
 Rule	Cuba	1940	1942	-	Jun	Sun>=1	0:00	1:00	D
 Rule	Cuba	1940	1942	-	Sep	Sun>=1	0:00	0	S
 Rule	Cuba	1945	1946	-	Jun	Sun>=1	0:00	1:00	D
 Rule	Cuba	1945	1946	-	Sep	Sun>=1	0:00	0	S
 Rule	Cuba	1965	only	-	Jun	1	0:00	1:00	D
 Rule	Cuba	1965	only	-	Sep	30	0:00	0	S
 Rule	Cuba	1966	only	-	May	29	0:00	1:00	D
 Rule	Cuba	1966	only	-	Oct	2	0:00	0	S
 Rule	Cuba	1967	only	-	Apr	8	0:00	1:00	D
 Rule	Cuba	1967	1968	-	Sep	Sun>=8	0:00	0	S
 Rule	Cuba	1968	only	-	Apr	14	0:00	1:00	D
 Rule	Cuba	1969	1977	-	Apr	lastSun	0:00	1:00	D
 Rule	Cuba	1969	1971	-	Oct	lastSun	0:00	0	S
 Rule	Cuba	1972	1974	-	Oct	8	0:00	0	S
 Rule	Cuba	1975	1977	-	Oct	lastSun	0:00	0	S
 Rule	Cuba	1978	only	-	May	7	0:00	1:00	D
 Rule	Cuba	1978	1990	-	Oct	Sun>=8	0:00	0	S
 Rule	Cuba	1979	1980	-	Mar	Sun>=15	0:00	1:00	D
 Rule	Cuba	1981	1985	-	May	Sun>=5	0:00	1:00	D
 Rule	Cuba	1986	1989	-	Mar	Sun>=14	0:00	1:00	D
 Rule	Cuba	1990	1997	-	Apr	Sun>=1	0:00	1:00	D
 Rule	Cuba	1991	1995	-	Oct	Sun>=8	0:00s	0	S
 Rule	Cuba	1996	only	-	Oct	 6	0:00s	0	S
 Rule	Cuba	1997	only	-	Oct	12	0:00s	0	S
 Rule	Cuba	1998	1999	-	Mar	lastSun	0:00s	1:00	D
 Rule	Cuba	1998	2003	-	Oct	lastSun	0:00s	0	S
 Rule	Cuba	2000	2003	-	Apr	Sun>=1	0:00s	1:00	D
 Rule	Cuba	2004	only	-	Mar	lastSun	0:00s	1:00	D
 Rule	Cuba	2006	2010	-	Oct	lastSun	0:00s	0	S
 Rule	Cuba	2007	only	-	Mar	Sun>=8	0:00s	1:00	D
 Rule	Cuba	2008	only	-	Mar	Sun>=15	0:00s	1:00	D
 Rule	Cuba	2009	2010	-	Mar	Sun>=8	0:00s	1:00	D
 Rule	Cuba	2011	only	-	Mar	Sun>=15	0:00s	1:00	D
 Rule	Cuba	2011	only	-	Nov	13	0:00s	0	S
 Rule	Cuba	2012	only	-	Apr	1	0:00s	1:00	D
 Rule	Cuba	2012	max	-	Nov	Sun>=1	0:00s	0	S
 Rule	Cuba	2013	max	-	Mar	Sun>=8	0:00s	1:00	D
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Havana	-5:29:28 -	LMT	1890
 			-5:29:36 -	HMT	1925 Jul 19 12:00 # Havana MT
 			-5:00	Cuba	C%sT
 
 # Dominican Republic
 
 # From Steffen Thorsen (2000-10-30):
 # Enrique Morales reported to me that the Dominican Republic has changed the
 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
 # http://www.listin.com.do/antes/261000/republica/princi.html
 
 # From Paul Eggert (2000-12-04):
 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
 
 # From Rives McDow (2000-12-01):
 # Dominican Republic changed its mind and presidential decree on Tuesday,
 # November 28, 2000, with a new decree.  On Sunday, December 3 at 1:00 AM the
 # Dominican Republic will be reverting to 8 hours from the International Date
 # Line, and will not be using DST in the foreseeable future.  The reason they
 # decided to use DST was to be in synch with Puerto Rico, who was also going
 # to implement DST.  When Puerto Rico didn't implement DST, the president
 # decided to revert.
 
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	DR	1966	only	-	Oct	30	0:00	1:00	EDT
 Rule	DR	1967	only	-	Feb	28	0:00	0	EST
 Rule	DR	1969	1973	-	Oct	lastSun	0:00	0:30	-0430
 Rule	DR	1970	only	-	Feb	21	0:00	0	EST
 Rule	DR	1971	only	-	Jan	20	0:00	0	EST
 Rule	DR	1972	1974	-	Jan	21	0:00	0	EST
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Santo_Domingo -4:39:36 -	LMT	1890
 			-4:40	-	SDMT	1933 Apr  1 12:00 # S. Dom. MT
 			-5:00	DR	%s	1974 Oct 27
 			-4:00	-	AST	2000 Oct 29  2:00
 			-5:00	US	E%sT	2000 Dec  3  1:00
 			-4:00	-	AST
 
 # El Salvador
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Salv	1987	1988	-	May	Sun>=1	0:00	1:00	D
 Rule	Salv	1987	1988	-	Sep	lastSun	0:00	0	S
 # There are too many San Salvadors elsewhere, so use America/El_Salvador
 # instead of America/San_Salvador.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/El_Salvador -5:56:48 -	LMT	1921 # San Salvador
 			-6:00	Salv	C%sT
 
 # Guatemala
 #
 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
 # Diario Co Latino, at
 # ,
 # says in an article dated 2006-04-19 that the Guatemalan government had
 # decided on that date to advance official time by 60 minutes, to lessen the
 # impact of the elevated cost of oil....  Daylight saving time will last from
 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
 # From Paul Eggert (2006-06-22):
 # The Ministry of Energy and Mines, press release CP-15/2006
 # (2006-04-19), says DST ends at 24:00.  See
 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Guat	1973	only	-	Nov	25	0:00	1:00	D
 Rule	Guat	1974	only	-	Feb	24	0:00	0	S
 Rule	Guat	1983	only	-	May	21	0:00	1:00	D
 Rule	Guat	1983	only	-	Sep	22	0:00	0	S
 Rule	Guat	1991	only	-	Mar	23	0:00	1:00	D
 Rule	Guat	1991	only	-	Sep	 7	0:00	0	S
 Rule	Guat	2006	only	-	Apr	30	0:00	1:00	D
 Rule	Guat	2006	only	-	Oct	 1	0:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Guatemala	-6:02:04 -	LMT	1918 Oct 5
 			-6:00	Guat	C%sT
 
 # Haiti
 # From Gwillim Law (2005-04-15):
 # Risto O. Nykänen wrote me that Haiti is now on DST.
 # I searched for confirmation, and I found a press release
 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
 # .  Translated from French, it says:
 #
 #  "The Prime Minister's Communication Office notifies the public in general
 #   and the press in particular that, following a decision of the Interior
 #   Ministry and the Territorial Collectivities [I suppose that means the
 #   provinces], Haiti will move to Eastern Daylight Time in the night from next
 #   Saturday the 2nd to Sunday the 3rd.
 #
 #  "Consequently, the Prime Minister's Communication Office wishes to inform
 #   the population that the country's clocks will be set forward one hour
 #   starting at midnight.  This provision will hold until the last Saturday in
 #   October 2005.
 #
 #  "Port-au-Prince, March 31, 2005"
 #
 # From Steffen Thorsen (2006-04-04):
 # I have been informed by users that Haiti observes DST this year like
 # last year, so the current "only" rule for 2005 might be changed to a
 # "max" rule or to last until 2006. (Who knows if they will observe DST
 # next year or if they will extend their DST like US/Canada next year).
 #
 # I have found this article about it (in French):
 # http://www.haitipressnetwork.com/news.cfm?articleID=7612
 #
 # The reason seems to be an energy crisis.
 
 # From Stephen Colebourne (2007-02-22):
 # Some IATA info: Haiti won't be having DST in 2007.
 
 # From Steffen Thorsen (2012-03-11):
 # According to several news sources, Haiti will observe DST this year,
 # apparently using the same start and end date as USA/Canada.
 # So this means they have already changed their time.
 #
 # http://www.alterpresse.org/spip.php?article12510
 # http://radiovision2000haiti.net/home/?p=13253
 #
 # From Arthur David Olson (2012-03-11):
 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
 # Assume a US-style fall back as well.
 
 # From Steffen Thorsen (2013-03-10):
 # It appears that Haiti is observing DST this year as well, same rules
 # as US/Canada.  They did it last year as well, and it looks like they
 # are going to observe DST every year now...
 #
 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
 # http://www.canalplushaiti.net/?p=6714
 
 # From Steffen Thorsen (2016-03-12):
 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
 # are not going on DST this year.  Several other resources confirm this: ...
 # https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
 # https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/
 
 # From Steffen Thorsen (2017-03-12):
 # We have received 4 mails from different people telling that Haiti
 # has started DST again today, and this source seems to confirm that,
 # I have not been able to find a more authoritative source:
 # https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Haiti	1983	only	-	May	8	0:00	1:00	D
 Rule	Haiti	1984	1987	-	Apr	lastSun	0:00	1:00	D
 Rule	Haiti	1983	1987	-	Oct	lastSun	0:00	0	S
 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
 # Go with IATA.
 Rule	Haiti	1988	1997	-	Apr	Sun>=1	1:00s	1:00	D
 Rule	Haiti	1988	1997	-	Oct	lastSun	1:00s	0	S
 Rule	Haiti	2005	2006	-	Apr	Sun>=1	0:00	1:00	D
 Rule	Haiti	2005	2006	-	Oct	lastSun	0:00	0	S
 Rule	Haiti	2012	2015	-	Mar	Sun>=8	2:00	1:00	D
 Rule	Haiti	2012	2015	-	Nov	Sun>=1	2:00	0	S
 Rule	Haiti	2017	max	-	Mar	Sun>=8	2:00	1:00	D
 Rule	Haiti	2017	max	-	Nov	Sun>=1	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Port-au-Prince -4:49:20 -	LMT	1890
 			-4:49	-	PPMT	1917 Jan 24 12:00 # P-a-P MT
 			-5:00	Haiti	E%sT
 
 # Honduras
 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
 
 # From Paul Eggert (2006-05-05):
 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
 # saying Honduras will start using DST midnight Saturday, effective 4
 # months until September.  La Tribuna reported today
 #  that Manuel Zelaya, the president
 # of Honduras, refused to back down on this.
 
 # From Jesper Nørgaard Welen (2006-08-08):
 # It seems that Honduras has returned from DST to standard time this Monday at
 # 00:00 hours (prolonging Sunday to 25 hours duration).
 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
 
 # From Paul Eggert (2006-08-08):
 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12
 # It mentions executive decree 18-2006.
 
 # From Steffen Thorsen (2006-08-17):
 # Honduras will observe DST from 2007 to 2009, exact dates are not
 # published, I have located this authoritative source:
 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
 
 # From Steffen Thorsen (2007-03-30):
 # http://www.laprensahn.com/pais_nota.php?id04962=7386
 # So it seems that Honduras will not enter DST this year....
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Hond	1987	1988	-	May	Sun>=1	0:00	1:00	D
 Rule	Hond	1987	1988	-	Sep	lastSun	0:00	0	S
 Rule	Hond	2006	only	-	May	Sun>=1	0:00	1:00	D
 Rule	Hond	2006	only	-	Aug	Mon>=1	0:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Tegucigalpa -5:48:52 -	LMT	1921 Apr
 			-6:00	Hond	C%sT
 #
 # Great Swan I ceded by US to Honduras in 1972
 
 # Jamaica
 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
 # unspecified official document, and says "This time is used throughout the
 # island".  Go with Milne.
 #
 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
 # Assume Neita meant Jan 6 02:00, the same as the US.  Neita also writes that
 # Manley's supporters associated this act with Manley's nickname "Joshua"
 # (recall that in the Bible the sun stood still at Joshua's request),
 # and with the Rod of Correction which Manley said he had received from
 # Haile Selassie, Emperor of Ethiopia.  See:
 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-5:07:10.41
 Zone	America/Jamaica	-5:07:10 -	LMT	1890        # Kingston
 			-5:07:10 -	KMT	1912 Feb    # Kingston Mean Time
 			-5:00	-	EST	1974
 			-5:00	US	E%sT	1984
 			-5:00	-	EST
 
 # Martinique
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Martinique	-4:04:20 -      LMT	1890        # Fort-de-France
 			-4:04:20 -	FFMT	1911 May    # Fort-de-France MT
 			-4:00	-	AST	1980 Apr  6
 			-4:00	1:00	ADT	1980 Sep 28
 			-4:00	-	AST
 
 # Nicaragua
 #
 # This uses Shanks & Pottenger for times before 2005.
 #
 # From Steffen Thorsen (2005-04-12):
 # I've got reports from 8 different people that Nicaragua just started
 # DST on Sunday 2005-04-10, in order to save energy because of
 # expensive petroleum.  The exact end date for DST is not yet
 # announced, only "September" but some sites also say "mid-September".
 # Some background information is available on the President's official site:
 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
 # The Decree, no 23-2005 is available here:
 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
 #
 # From Paul Eggert (2005-05-01):
 # The decree doesn't say anything about daylight saving, but for now let's
 # assume that it is daylight saving....
 #
 # From Gwillim Law (2005-04-21):
 # The Associated Press story on the time change, which can be found at
 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
 # time that a change of clocks was applied to save energy was in the year 2000
 # during the Arnoldo Alemán administration."...
 # The northamerica file says that Nicaragua has been on UTC-6 continuously
 # since December 1998.  I wasn't able to find any details of Nicaraguan time
 # changes in 2000.  Perhaps a note could be added to the northamerica file, to
 # the effect that we have indirect evidence that DST was observed in 2000.
 #
 # From Jesper Nørgaard Welen (2005-11-02):
 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
 # (2005-09-26)
 #
 # From Jesper Nørgaard Welen (2006-05-05):
 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
 # (my informal translation)
 # By order of the president of the republic, Enrique Bolaños, Nicaragua
 # advanced by sixty minutes their official time, yesterday at 2 in the
 # morning, and will stay that way until 30th of September.
 #
 # From Jesper Nørgaard Welen (2006-09-30):
 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
 # My informal translation runs:
 # The natural sun time is restored in all the national territory, in that the
 # time is returned one hour at 01:00 am of October 1 of 2006.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Nic	1979	1980	-	Mar	Sun>=16	0:00	1:00	D
 Rule	Nic	1979	1980	-	Jun	Mon>=23	0:00	0	S
 Rule	Nic	2005	only	-	Apr	10	0:00	1:00	D
 Rule	Nic	2005	only	-	Oct	Sun>=1	0:00	0	S
 Rule	Nic	2006	only	-	Apr	30	2:00	1:00	D
 Rule	Nic	2006	only	-	Oct	Sun>=1	1:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Managua	-5:45:08 -	LMT	1890
 			-5:45:12 -	MMT	1934 Jun 23 # Managua Mean Time?
 			-6:00	-	CST	1973 May
 			-5:00	-	EST	1975 Feb 16
 			-6:00	Nic	C%sT	1992 Jan  1  4:00
 			-5:00	-	EST	1992 Sep 24
 			-6:00	-	CST	1993
 			-5:00	-	EST	1997
 			-6:00	Nic	C%sT
 
 # Cayman Is
 # Panama
 #
 # Atikokan and Coral Harbour, Canada, match Panama since 1970.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Panama	-5:18:08 -	LMT	1890
 			-5:19:36 -	CMT	1908 Apr 22 # Colón Mean Time
 			-5:00	-	EST
 
 # Anguilla
 # Antigua & Barbuda
 # Aruba
 # Caribbean Netherlands
 # Curaçao
 # Dominica
 # Grenada
 # Guadeloupe
 # Montserrat
 # Puerto Rico
 # St Barthélemy
 # St Kitts-Nevis
 # Sint Maarten / St Martin
 # St Lucia
 # St Vincent & the Grenadines
 # Trinidad & Tobago
 # Virgin Is (UK & US)
 #
 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Puerto_Rico -4:24:25 -	LMT	1899 Mar 28 12:00 # San Juan
 			-4:00	-	AST	1942 May  3
 			-4:00	US	A%sT	1946
 			-4:00	-	AST
 
 # St Pierre and Miquelon
 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Miquelon	-3:44:40 -	LMT	1911 May 15 # St Pierre
 			-4:00	-	AST	1980 May
 			-3:00	-	-03	1987
 			-3:00	Canada	-03/-02
 
 # Turks and Caicos
 #
 # From Chris Dunn in
 # https://bugs.debian.org/415007
 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
 # daylight saving dates for time changes have been adjusted to match
 # the recent U.S. change of dates.
 #
 # From Brian Inglis (2007-04-28):
 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
 # rows before that there is an out of date entry for Oct:
 # "Eastern Standard Times Begins 2007
 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
 # indicating that the normal ET rules are followed.
 
 # From Paul Eggert (2014-08-19):
 # The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round.  See:
 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
 # Model this as a switch from EST/EDT to AST ...
 # From Chris Walton (2014-11-04):
 # ... the TCI government appears to have delayed the switch to
 # "permanent daylight saving time" by one year....
 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
 #
 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
 # during the summer months and Standard Time, also known as Local
 # Time, during the winter months with effect from April 2018 ...
 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
 # From Paul Eggert (2017-08-26):
 # The date of effect of the spring 2018 change appears to be March 11,
 # which makes more sense.  See: Hamilton D. Time change back
 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
 #
 # From P Chan (2020-11-27):
 # Standard Time Declaration Order 2015 (L.N. 15/2015)
 # http://online.fliphtml5.com/fizd/czin/#p=2
 #
 # Standard Time Declaration Order 2017 (L.N. 31/2017)
 # http://online.fliphtml5.com/fizd/dmcu/#p=2
 #
 # From Tim Parenti (2020-12-05):
 # Although L.N. 31/2017 reads that it "shall come into operation at 2:00 a.m.
 # on 11th March 2018", a precise interpretation here poses some problems.  The
 # order states that "the standard time to be observed throughout the Turks and
 # Caicos Islands shall be the same time zone as the Eastern United States of
 # America" and further clarifies "[f]or the avoidance of doubt" that it
 # "applies to the Eastern Standard Time as well as any changes thereto for
 # Daylight Saving Time."  However, as clocks in Turks and Caicos approached
 # 02:00 -04, and thus the declared implementation time, it was still 01:00 EST
 # (-05), as DST in the Eastern US would not start until an hour later.
 #
 # Since it is unlikely that those on the islands switched their clocks twice in
 # the span of an hour, we assume instead that the adoption of EDT actually took
 # effect once clocks in the Eastern US had sprung forward, from 03:00 -04.
 # This discrepancy only affects the time zone abbreviation and DST flag for the
 # intervening hour, not wall clock times, as -04 was maintained throughout.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Grand_Turk	-4:44:32 -	LMT	1890
 		#STDOFF	-5:07:10.41
 			-5:07:10 -	KMT	1912 Feb # Kingston Mean Time
 			-5:00	-	EST	1979
 			-5:00	US	E%sT	2015 Mar  8  2:00
 			-4:00	-	AST	2018 Mar 11  3:00
 			-5:00	US	E%sT
 
 # Local Variables:
 # coding: utf-8
 # End:
diff --git a/southamerica b/southamerica
index 13cc65efa32b..87b71d5f9210 100644
--- a/southamerica
+++ b/southamerica
@@ -1,2005 +1,2010 @@
 # tzdb data for South America and environs
 
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
 # This file is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
 # From Paul Eggert (2016-12-05):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 # Unfortunately this book contains many errors and cites no sources.
 #
 # Many years ago Gwillim Law wrote that a good source
 # for time zone data was the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
 # of the IATA's data after 1990.  Except where otherwise noted,
 # IATA SSIM is the source for entries after 1990.
 #
 # For data circa 1899, a common source is:
 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
 # https://www.jstor.org/stable/1774359
 #
 # These tables use numeric abbreviations like -03 and -0330 for
 # integer hour and minute UT offsets.  Although earlier editions used
 # alphabetic time zone abbreviations, these abbreviations were
 # invented and did not reflect common practice.
 
 ###############################################################################
 
 ###############################################################################
 
 # Argentina
 
 # From Bob Devine (1988-01-28):
 # Argentina: first Sunday in October to first Sunday in April since 1976.
 # Double Summer time from 1969 to 1974.  Switches at midnight.
 
 # From U. S. Naval Observatory (1988-01-19):
 # ARGENTINA           3 H BEHIND   UTC
 
 # From Hernan G. Otero (1995-06-26):
 # I am sending modifications to the Argentine time zone table...
 # AR was chosen because they are the ISO letters that represent Argentina.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Arg	1930	only	-	Dec	 1	0:00	1:00	-
 Rule	Arg	1931	only	-	Apr	 1	0:00	0	-
 Rule	Arg	1931	only	-	Oct	15	0:00	1:00	-
 Rule	Arg	1932	1940	-	Mar	 1	0:00	0	-
 Rule	Arg	1932	1939	-	Nov	 1	0:00	1:00	-
 Rule	Arg	1940	only	-	Jul	 1	0:00	1:00	-
 Rule	Arg	1941	only	-	Jun	15	0:00	0	-
 Rule	Arg	1941	only	-	Oct	15	0:00	1:00	-
 Rule	Arg	1943	only	-	Aug	 1	0:00	0	-
 Rule	Arg	1943	only	-	Oct	15	0:00	1:00	-
 Rule	Arg	1946	only	-	Mar	 1	0:00	0	-
 Rule	Arg	1946	only	-	Oct	 1	0:00	1:00	-
 Rule	Arg	1963	only	-	Oct	 1	0:00	0	-
 Rule	Arg	1963	only	-	Dec	15	0:00	1:00	-
 Rule	Arg	1964	1966	-	Mar	 1	0:00	0	-
 Rule	Arg	1964	1966	-	Oct	15	0:00	1:00	-
 Rule	Arg	1967	only	-	Apr	 2	0:00	0	-
 Rule	Arg	1967	1968	-	Oct	Sun>=1	0:00	1:00	-
 Rule	Arg	1968	1969	-	Apr	Sun>=1	0:00	0	-
 Rule	Arg	1974	only	-	Jan	23	0:00	1:00	-
 Rule	Arg	1974	only	-	May	 1	0:00	0	-
 Rule	Arg	1988	only	-	Dec	 1	0:00	1:00	-
 #
 # From Hernan G. Otero (1995-06-26):
 # These corrections were contributed by InterSoft Argentina S.A.,
 # obtaining the data from the:
 # Talleres de Hidrografía Naval Argentina
 # (Argentine Naval Hydrography Institute)
 Rule	Arg	1989	1993	-	Mar	Sun>=1	0:00	0	-
 Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	-
 #
 # From Hernan G. Otero (1995-06-26):
 # From this moment on, the law that mandated the daylight saving
 # time corrections was derogated and no more modifications
 # to the time zones (for daylight saving) are now made.
 #
 # From Rives McDow (2000-01-10):
 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
 # which did not result in the switch of a time zone, as they stayed 9 hours
 # from the International Date Line.
 Rule	Arg	1999	only	-	Oct	Sun>=1	0:00	1:00	-
 # From Paul Eggert (2007-12-28):
 # DST was set to expire on March 5, not March 3, but since it was converted
 # to standard time on March 3 it's more convenient for us to pretend that
 # it ended on March 3.
 Rule	Arg	2000	only	-	Mar	3	0:00	0	-
 #
 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
 # We just checked with our São Paulo office and they say the government of
 # Argentina decided not to become one of the countries that go on or off DST.
 # So Buenos Aires should be -3 hours from GMT at all times.
 #
 # From Fabián L. Arce Jofré (2000-04-04):
 # The law that claimed DST for Argentina was derogated by President Fernando
 # de la Rúa on March 2, 2000, because it would make people spend more energy
 # in the winter time, rather than less.  The change took effect on March 3.
 #
 # From Mariano Absatz (2001-06-06):
 # one of the major newspapers here in Argentina said that the 1999
 # Timezone Law (which never was effectively applied) will (would?) be
 # in effect.... The article is at
 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted
 # 1999-09-17, and published 1999-09-21.  The official publication is at:
 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
 # Regretfully, you have to subscribe (and pay) for the on-line version....
 #
 # (2001-06-12):
 # the timezone for Argentina will not change next Sunday.
 # Apparently it will do so on Sunday 24th....
 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
 #
 # (2001-06-25):
 # Last Friday (yes, the last working day before the date of the change), the
 # Senate annulled the 1999 law that introduced the changes later postponed.
 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
 # It remains the vote of the Deputies..., but it will be the same....
 # This kind of things had always been done this way in Argentina.
 # We are still -03:00 all year round in all of the country.
 #
 # From Steffen Thorsen (2007-12-21):
 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
 # all of the country (all Zone-entries) are affected.  News reports like
 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate
 # that Argentina will use DST next year as well, from October to
 # March, although exact rules are not given.
 #
 # From Jesper Nørgaard Welen (2007-12-26)
 # The last hurdle of Argentina DST is over, the proposal was approved in
 # the lower chamber too (Diputados) with a vote 192 for and 2 against.
 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to
 # the original scanned proposal, where the dates and the zero hours are
 # clear and unambiguous...This is the article about final approval:
 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996
 #
 # From Paul Eggert (2007-12-22):
 # For dates after mid-2008, the following rules are my guesses and
 # are quite possibly wrong, but are more likely than no DST at all.
 
 # From Alexander Krivenyshev (2008-09-05):
 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua),
 # Argentina will start DST on Sunday October 19, 2008.
 #
 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html
 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish)
 
 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07)
 # via Rodrigo Severo:
 # Argentinian law No. 25.155 is no longer valid.
 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm
 # The new one is law No. 26.350
 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm
 # So there is no summer time in Argentina for now.
 
 # From Mariano Absatz (2008-10-20):
 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST
 # in Argentina from 2008-10-19 until 2009-03-15.
 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01
 #
 
 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer
 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La
 # Pampa, Neuquén, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego
 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01
 #
 # Press release 235 dated Saturday October 18th, from the Government of the
 # Province of Jujuy saying it will not apply DST either (even when it was not
 # included in Decree 1705/2008).
 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc
 
 # From fullinet (2009-10-18):
 # As announced in
 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356
 # (an official .gob.ar) under title: "Sin Cambio de Hora"
 # (English: "No hour change").
 #
 # "Por el momento, el Gobierno Nacional resolvió no modificar la hora
 # oficial, decisión que estaba en estudio para su implementación el
 # domingo 18 de octubre. Desde el Ministerio de Planificación se anunció
 # que la Argentina hoy, en estas condiciones meteorológicas, no necesita
 # la modificación del huso horario, ya que 2009 nos encuentra con
 # crecimiento en la producción y distribución energética."
 
 Rule	Arg	2007	only	-	Dec	30	0:00	1:00	-
 Rule	Arg	2008	2009	-	Mar	Sun>=15	0:00	0	-
 Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	-
 
 # From Mariano Absatz (2004-05-21):
 # Today it was officially published that the Province of Mendoza is changing
 # its timezone this winter... starting tomorrow night....
 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf
 # From Paul Eggert (2004-05-24):
 # It's Law No. 7,210.  This change is due to a public power emergency, so for
 # now we'll assume it's for this year only.
 #
 # From Paul Eggert (2018-01-31):
 # Hora de verano para la República Argentina
 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html
 # says that standard time in Argentina from 1894-10-31
 # to 1920-05-01 was -4:16:48.25.  Go with this more-precise value
 # over Shanks & Pottenger.  It is upward compatible with Milne, who
 # says Córdoba time was -4:16:48.2.
 
 #
 # From Mariano Absatz (2004-06-05):
 # These media articles from a major newspaper mostly cover the current state:
 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
 #
 # The following eight (8) provinces pulled clocks back to UTC-04:00 at
 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
 # Apparently, all nine provinces would go back to UTC-03:00 at the same
 # time in October 17th.
 #
 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
 # Tierra del Fuego, Tucumán.
 #
 # From Mariano Absatz (2004-06-14):
 # ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
 # annoyance with the change is much higher than the power savings obtained....
 #
 # From Gwillim Law (2004-06-14):
 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ...
 #     "The time change in Tierra del Fuego was a conflicted decision from
 #   the start.  The government had decreed that the measure would take
 #   effect on June 1, but a normative error forced the new time to begin
 #   three days earlier, from a Saturday to a Sunday....
 # Our understanding was that the change was originally scheduled to take place
 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other
 # provinces).  Sunday was May 30, only two days earlier.  So the article
 # contains a contradiction.  I would give more credence to the Saturday/Sunday
 # date than the "three days earlier" phrase, and conclude that Tierra del
 # Fuego set its clocks back at 2004-05-30 00:00.
 #
 # From Steffen Thorsen (2004-10-05):
 # The previous law 7210 which changed the province of Mendoza's time zone
 # back in May have been modified slightly in a new law 7277, which set the
 # new end date to 2004-09-26 (original date was 2004-10-17).
 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
 #
 # From Mariano Absatz (2004-10-05):
 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
 # Sunday, May 30th and Monday, May 31st.  It changed back to UTC-03:00
 # at midnight between Saturday, July 24th and Sunday, July 25th....
 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html
 
 # From Alex Krivenyshev (2008-01-17):
 # Here are articles that Argentina Province San Luis is planning to end DST
 # as earlier as upcoming Monday January 21, 2008 or February 2008:
 #
 # Provincia argentina retrasa reloj y marca diferencia con resto del país
 # (Argentine Province delayed clock and mark difference with the rest of the
 # country)
 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel
 #
 # Es inminente que en San Luis atrasen una hora los relojes
 # (It is imminent in San Luis clocks one hour delay)
 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html
 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html
 
 # From Jesper Nørgaard Welen (2008-01-18):
 # The page of the San Luis provincial government
 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812
 # confirms what Alex Krivenyshev has earlier sent to the tz
 # emailing list about that San Luis plans to return to standard
 # time much earlier than the rest of the country. It also
 # confirms that upon request the provinces San Juan and Mendoza
 # refused to follow San Luis in this change.
 #
 # The change is supposed to take place Monday the 21st at 0:00
 # hours. As far as I understand it if this goes ahead, we need
 # a new timezone for San Luis (although there are also documented
 # independent changes in the southamerica file of San Luis in
 # 1990 and 1991 which has not been confirmed).
 
 # From Jesper Nørgaard Welen (2008-01-25):
 # Unfortunately the below page has become defunct, about the San Luis
 # time change. Perhaps because it now is part of a group of pages "Most
 # important pages of 2008."
 #
 # You can use
 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834
 # instead it seems. Or use "Buscador" from the main page of the San Luis
 # government, and fill in "huso" and click OK, and you will get 3 pages
 # from which the first one is identical to the above.
 
 # From Mariano Absatz (2008-01-28):
 # I can confirm that the Province of San Luis (and so far only that
 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008
 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
 # 1 hour), and they intend to keep UTC-3 as their timezone all year round
 # (that is, unless they change their mind any minute now).
 #
 # So we'll have to add yet another city to 'southamerica' (I think San
 # Luis city is the mos populated city in the Province, so it'd be
 # America/Argentina/San_Luis... of course I can't remember if San Luis's
 # history of particular changes goes along with Mendoza or San Juan :-(
 # (I only remember not being able to collect hard facts about San Luis
 # back in 2004, when these provinces changed to UTC-4 for a few days, I
 # mailed them personally and never got an answer).
 
 # From Paul Eggert (2014-08-12):
 # Unless otherwise specified, data entries are from Shanks & Pottenger through
 # 1992, from the IATA otherwise.  As noted below, Shanks & Pottenger say that
 # America/Cordoba split into 6 subregions during 1991/1992, one of which
 # was America/San_Luis, but we haven't verified this yet so for now we'll
 # keep America/Cordoba a single region rather than splitting it into the
 # other 5 subregions.
 
 # From Mariano Absatz (2009-03-13):
 # Yesterday (with our usual 2-day notice) the Province of San Luis
 # decided that next Sunday instead of "staying" @utc-03:00 they will go
 # to utc-04:00 until the second Saturday in October...
 #
 # The press release is at
 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
 # (I couldn't find the decree, but www.sanluis.gov.ar
 # is the official page for the Province Government.)
 #
 # There's also a note in only one of the major national papers ...
 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912
 #
 # The press release says [quick and dirty translation]:
 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis
 # inhabitants) will have to turn back one hour their clocks
 #
 # Since then, San Luis will establish its own Province timezone. Thus,
 # during 2009, this timezone change will run from 00:00 the third Sunday
 # in March until 24:00 of the second Saturday in October.
 
 # From Mariano Absatz (2009-10-16):
 # ...the Province of San Luis is a case in itself.
 #
 # The Law at
 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276
 # is ambiguous because establishes a calendar from the 2nd Sunday in
 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the
 # complement of that starting on the 2nd Sunday of March at 0:00 and
 # ending on the 2nd Saturday of March at 24:00.
 #
 # This clearly breaks every time the 1st of March or October is a Sunday.
 #
 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd
 # Sunday of October and March.
 #
 # The problem is that the changes in the rest of the Provinces that did
 # change in 2007/2008, were made according to the Federal Law and Decrees
 # that did so on the 3rd Sunday of October and March.
 #
 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
 # (October 11th) at 0:00.
 #
 # So I guess a new set of rules, besides "Arg", must be made and the last
 # America/Argentina/San_Luis entries should change to use these...
 # ...
 
 # From Alexander Krivenyshev (2010-04-09):
 # According to news reports from El Diario de la República Province San
 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
 # after April 11, 2010 - will continue to have same time as rest of
 # Argentina (UTC-3) (no DST).
 #
 # Confirmaron la prórroga del huso horario de verano (Spanish)
 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
 # or (some English translation):
 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html
 
 # From Mariano Absatz (2010-04-12):
 # yes...I can confirm this...and given that San Luis keeps calling
 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
 # rules...San Luis is still using "Western ARgentina Time" and it got
 # stuck on Summer daylight savings time even though the summer is over.
 
 # From Paul Eggert (2018-01-23):
 # Perhaps San Luis operates on the legal fiction that it is at -04
 # with perpetual daylight saving time, but ordinary usage typically seems to
 # just say it's at -03; see, for example,
 # https://es.wikipedia.org/wiki/Hora_oficial_argentina
 # We've documented similar situations as being plain changes to
 # standard time, so let's do that here too.  This does not change UTC
 # offsets, only tm_isdst and the time zone abbreviations.  One minor
 # plus is that this silences a zic complaint that there's no POSIX TZ
 # setting for timestamps past 2038.
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 #
 # Buenos Aires (BA), Capital Federal (CF),
 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May    # Córdoba Mean Time
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	Arg	-03/-02
 #
 # Córdoba (CB), Santa Fe (SF), Entre Ríos (ER), Corrientes (CN), Misiones (MN),
 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
 #
 # Shanks & Pottenger also make the following claims, which we haven't verified:
 # - Formosa switched to -3:00 on 1991-01-07.
 # - Misiones switched to -3:00 on 1990-12-29.
 # - Chaco switched to -3:00 on 1991-01-04.
 # - Santiago del Estero switched to -4:00 on 1991-04-01,
 #   then to -3:00 on 1991-04-26.
 #
 		#STDOFF	       -4:16:48.25
 Zone America/Argentina/Cordoba -4:16:48 - LMT	1894 Oct 31
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  3
 			-4:00	-	-04	1991 Oct 20
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	Arg	-03/-02
 #
 # Salta (SA), La Pampa (LP), Neuquén (NQ), Rio Negro (RN)
 Zone America/Argentina/Salta -4:21:40 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  3
 			-4:00	-	-04	1991 Oct 20
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # Tucumán (TM)
 Zone America/Argentina/Tucuman -4:20:52 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  3
 			-4:00	-	-04	1991 Oct 20
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 Jun  1
 			-4:00	-	-04	2004 Jun 13
 			-3:00	Arg	-03/-02
 #
 # La Rioja (LR)
 Zone America/Argentina/La_Rioja -4:27:24 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  1
 			-4:00	-	-04	1991 May  7
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 Jun  1
 			-4:00	-	-04	2004 Jun 20
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # San Juan (SJ)
 Zone America/Argentina/San_Juan -4:34:04 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  1
 			-4:00	-	-04	1991 May  7
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 May 31
 			-4:00	-	-04	2004 Jul 25
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # Jujuy (JY)
 Zone America/Argentina/Jujuy -4:21:12 -	LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1990 Mar  4
 			-4:00	-	-04	1990 Oct 28
 			-4:00	1:00	-03	1991 Mar 17
 			-4:00	-	-04	1991 Oct  6
 			-3:00	1:00	-02	1992
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # Catamarca (CT), Chubut (CH)
 Zone America/Argentina/Catamarca -4:23:08 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1991 Mar  3
 			-4:00	-	-04	1991 Oct 20
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 Jun  1
 			-4:00	-	-04	2004 Jun 20
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # Mendoza (MZ)
 Zone America/Argentina/Mendoza -4:35:16 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1990 Mar  4
 			-4:00	-	-04	1990 Oct 15
 			-4:00	1:00	-03	1991 Mar  1
 			-4:00	-	-04	1991 Oct 15
 			-4:00	1:00	-03	1992 Mar  1
 			-4:00	-	-04	1992 Oct 18
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 May 23
 			-4:00	-	-04	2004 Sep 26
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # San Luis (SL)
 
 Rule	SanLuis	2008	2009	-	Mar	Sun>=8	0:00	0	-
 Rule	SanLuis	2007	2008	-	Oct	Sun>=8	0:00	1:00	-
 
 Zone America/Argentina/San_Luis -4:25:24 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1990
 			-3:00	1:00	-02	1990 Mar 14
 			-4:00	-	-04	1990 Oct 15
 			-4:00	1:00	-03	1991 Mar  1
 			-4:00	-	-04	1991 Jun  1
 			-3:00	-	-03	1999 Oct  3
 			-4:00	1:00	-03	2000 Mar  3
 			-3:00	-	-03	2004 May 31
 			-4:00	-	-04	2004 Jul 25
 			-3:00	Arg	-03/-02	2008 Jan 21
 			-4:00	SanLuis	-04/-03	2009 Oct 11
 			-3:00	-	-03
 #
 # Santa Cruz (SC)
 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 Jun  1
 			-4:00	-	-04	2004 Jun 20
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 #
 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
 Zone America/Argentina/Ushuaia -4:33:12 - LMT	1894 Oct 31
 		#STDOFF	-4:16:48.25
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	-04	1930 Dec
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1999 Oct  3
 			-4:00	Arg	-04/-03	2000 Mar  3
 			-3:00	-	-03	2004 May 30
 			-4:00	-	-04	2004 Jun 20
 			-3:00	Arg	-03/-02	2008 Oct 18
 			-3:00	-	-03
 
 # Bolivia
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/La_Paz	-4:32:36 -	LMT	1890
 			-4:32:36 -	CMT	1931 Oct 15 # Calamarca MT
 			-4:32:36 1:00	BST	1932 Mar 21 # Bolivia ST
 			-4:00	-	-04
 
 # Brazil
 
 # From Paul Eggert (1993-11-18):
 # The mayor of Rio recently attempted to change the time zone rules
 # just in his city, in order to leave more summer time for the tourist trade.
 # The rule change lasted only part of the day;
 # the federal government refused to follow the city's rules, and business
 # was in a chaos, so the mayor backed down that afternoon.
 
 # From IATA SSIM (1996-02):
 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
 # [The last three states are new to this issue of the IATA SSIM.]
 
 # From Gwillim Law (1996-10-07):
 # Geography, history (Tocantins was part of Goiás until 1989), and other
 # sources of time zone information lead me to believe that AL, SE, and TO were
 # always in BR1, and so the only change was whether or not they observed DST....
 # The earliest issue of the SSIM I have is 2/91.  Each issue from then until
 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
 # (UTC-4)....  The other two time zones given for Brazil are BR3, which is
 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
 # become part of the state of Pernambuco).  The boundary between BR1 and BR2
 # has never been clearly stated.  They've simply been called East and West.
 # However, some conclusions can be drawn from another IATA manual: the Airline
 # Coding Directory, which lists close to 400 airports in Brazil.  For each
 # airport it gives a time zone which is coded to the SSIM.  From that
 # information, I'm led to conclude that the states of Amapá (AP), Ceará (CE),
 # Maranhão (MA), Paraíba (PR), Pernambuco (PE), Piauí (PI), and Rio Grande do
 # Norte (RN), and the eastern part of Pará (PA) are all in BR1 without DST.
 
 # From Marcos Tadeu (1998-09-27):
 # Brazilian official page 
 
 # From Jesper Nørgaard (2000-11-03):
 # [For an official list of which regions in Brazil use which time zones, see:]
 # http://pcdsh01.on.br/Fusbr.htm
 # http://pcdsh01.on.br/Fusbrhv.htm
 
 # From Celso Doria via David Madeo (2002-10-09):
 # The reason for the delay this year has to do with elections in Brazil.
 #
 # Unlike in the United States, elections in Brazil are 100% computerized and
 # the results are known almost immediately.  Yesterday, it was the first
 # round of the elections when 115 million Brazilians voted for President,
 # Governor, Senators, Federal Deputies, and State Deputies.  Nobody is
 # counting (or re-counting) votes anymore and we know there will be a second
 # round for the Presidency and also for some Governors.  The 2nd round will
 # take place on October 27th.
 #
 # The reason why the DST will only begin November 3rd is that the thousands
 # of electoral machines used cannot have their time changed, and since the
 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
 # the Government decided to postpone DST, instead of changing the Constitution
 # (maybe, for the next elections, it will be possible to change the clock)...
 
 # From Rodrigo Severo (2004-10-04):
 # It's just the biannual change made necessary by the much hyped, supposedly
 # modern Brazilian ... voting machines which, apparently, can't deal
 # with a time change between the first and the second rounds of the elections.
 
 # From Steffen Thorsen (2007-09-20):
 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00:
 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975
 
 # From Paul Schulze (2008-06-24):
 # ...by law number 11.662 of April 24, 2008 (published in the "Diario
 # Oficial da União"...) in Brazil there are changes in the timezones,
 # effective today (00:00am at June 24, 2008) as follows:
 #
 # a) The timezone UTC+5 is extinguished, with all the Acre state and the
 # part of the Amazonas state that had this timezone now being put to the
 # timezone UTC+4
 # b) The whole Pará state now is put at timezone UTC+3, instead of just
 # part of it, as was before.
 #
 # This change follows a proposal of senator Tiao Viana of Acre state, that
 # proposed it due to concerns about open television channels displaying
 # programs inappropriate to youths in the states that had the timezone
 # UTC+5 too early in the night. In the occasion, some more corrections
 # were proposed, trying to unify the timezones of any given state. This
 # change modifies timezone rules defined in decree 2.784 of 18 June,
 # 1913.
 
 # From Rodrigo Severo (2008-06-24):
 # Just correcting the URL:
 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
 #
 # As a result of the above Decree I believe the America/Rio_Branco
 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
 # be created to represent the...west side of the Pará State. I
 # suggest this new timezone be called Santarem as the most
 # important/populated city in the affected area.
 #
 # This new timezone would be the same as the Rio_Branco timezone up to
 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
 
 # From Alex Krivenyshev (2008-06-24):
 # This is a quick reference page for New and Old Brazil Time Zones map.
 # http://www.worldtimezone.com/brazil-time-new-old.php
 #
 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05
 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western
 # part of Par state is moving to one timezone UTC-03 (from UTC-04).
 
 # From Paul Eggert (2002-10-10):
 # The official decrees referenced below are mostly taken from
 # Decretos sobre o Horário de Verão no Brasil.
 # http://pcdsh01.on.br/DecHV.html
 
 # From Steffen Thorsen (2008-08-29):
 # As announced by the government and many newspapers in Brazil late
 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and
 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on
 # past years experience with the elections, there was a good chance that
 # the start was postponed to November, but it did not happen this year.
 #
 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html
 #
 # An official page about it:
 # http://www.mme.gov.br/site/news/detail.do?newsId=16722
 # Note that this link does not always work directly, but must be accessed
 # by going to
 # http://www.mme.gov.br/first
 #
 # One example link that works directly:
 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54
 # (Portuguese)
 #
 # We have a written a short article about it as well:
 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html
 #
 # From Alexander Krivenyshev (2011-10-04):
 # State Bahia will return to Daylight savings time this year after 8 years off.
 # The announcement was made by Governor Jaques Wagner in an interview to a
 # television station in Salvador.
 
 # In Portuguese:
 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html
 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html
 
 # From Guilherme Bernardes Rodrigues (2011-10-07):
 # There is news in the media, however there is still no decree about it.
 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the
 # official agency about time in Brazil, and she confirmed that the old rule is
 # still in force.
 
 # From Guilherme Bernardes Rodrigues (2011-10-14)
 # It's official, the President signed a decree that includes Bahia in summer
 # time.
 #	 [ and in a second message (same day): ]
 # I found the decree.
 #
 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011
 # Link :
 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6
 
 # From Kelley Cook (2012-10-16):
 # The governor of state of Bahia in Brazil announced on Thursday that
 # due to public pressure, he is reversing the DST policy they implemented
 # last year and will not be going to Summer Time on October 21st....
 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia
 
 # From Rodrigo Severo (2012-10-16):
 # Tocantins state will have DST.
 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html
 
 # From Steffen Thorsen (2013-09-20):
 # Tocantins in Brazil is very likely not to observe DST from October....
 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto
 # We will keep this article updated when this is confirmed:
 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html
 
 # From Steffen Thorsen (2013-10-17):
 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html
 # Senator Jorge Viana announced that Acre will change time zone on November 10.
 # He did not specify the time of the change, nor if western parts of Amazonas
 # will change as well.
 #
 # From Paul Eggert (2013-10-17):
 # For now, assume western Amazonas will change as well.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Decree 20,466  (1931-10-01)
 # Decree 21,896  (1932-01-10)
 Rule	Brazil	1931	only	-	Oct	 3	11:00	1:00	-
 Rule	Brazil	1932	1933	-	Apr	 1	 0:00	0	-
 Rule	Brazil	1932	only	-	Oct	 3	 0:00	1:00	-
 # Decree 23,195  (1933-10-10)
 # revoked DST.
 # Decree 27,496  (1949-11-24)
 # Decree 27,998  (1950-04-13)
 Rule	Brazil	1949	1952	-	Dec	 1	 0:00	1:00	-
 Rule	Brazil	1950	only	-	Apr	16	 1:00	0	-
 Rule	Brazil	1951	1952	-	Apr	 1	 0:00	0	-
 # Decree 32,308  (1953-02-24)
 Rule	Brazil	1953	only	-	Mar	 1	 0:00	0	-
 # Decree 34,724  (1953-11-30)
 # revoked DST.
 # Decree 52,700  (1963-10-18)
 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
 # Decree 53,071  (1963-12-03)
 # extended the above decree to all of the national territory on 12-09.
 Rule	Brazil	1963	only	-	Dec	 9	 0:00	1:00	-
 # Decree 53,604  (1964-02-25)
 # extended summer time by one day to 1964-03-01 00:00 (start of school).
 Rule	Brazil	1964	only	-	Mar	 1	 0:00	0	-
 # Decree 55,639  (1965-01-27)
 Rule	Brazil	1965	only	-	Jan	31	 0:00	1:00	-
 Rule	Brazil	1965	only	-	Mar	31	 0:00	0	-
 # Decree 57,303  (1965-11-22)
 Rule	Brazil	1965	only	-	Dec	 1	 0:00	1:00	-
 # Decree 57,843  (1966-02-18)
 Rule	Brazil	1966	1968	-	Mar	 1	 0:00	0	-
 Rule	Brazil	1966	1967	-	Nov	 1	 0:00	1:00	-
 # Decree 63,429  (1968-10-15)
 # revoked DST.
 # Decree 91,698  (1985-09-27)
 Rule	Brazil	1985	only	-	Nov	 2	 0:00	1:00	-
 # Decree 92,310 (1986-01-21)
 # Decree 92,463 (1986-03-13)
 Rule	Brazil	1986	only	-	Mar	15	 0:00	0	-
 # Decree 93,316 (1986-10-01)
 Rule	Brazil	1986	only	-	Oct	25	 0:00	1:00	-
 Rule	Brazil	1987	only	-	Feb	14	 0:00	0	-
 # Decree 94,922  (1987-09-22)
 Rule	Brazil	1987	only	-	Oct	25	 0:00	1:00	-
 Rule	Brazil	1988	only	-	Feb	 7	 0:00	0	-
 # Decree 96,676  (1988-09-12)
 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
 Rule	Brazil	1988	only	-	Oct	16	 0:00	1:00	-
 Rule	Brazil	1989	only	-	Jan	29	 0:00	0	-
 # Decree 98,077  (1989-08-21)
 # with the same exceptions
 Rule	Brazil	1989	only	-	Oct	15	 0:00	1:00	-
 Rule	Brazil	1990	only	-	Feb	11	 0:00	0	-
 # Decree 99,530  (1990-09-17)
 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
 # Decree 99,629 (1990-10-19) adds BA, MT.
 Rule	Brazil	1990	only	-	Oct	21	 0:00	1:00	-
 Rule	Brazil	1991	only	-	Feb	17	 0:00	0	-
 # Unnumbered decree  (1991-09-25)
 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
 Rule	Brazil	1991	only	-	Oct	20	 0:00	1:00	-
 Rule	Brazil	1992	only	-	Feb	 9	 0:00	0	-
 # Unnumbered decree  (1992-10-16)
 # adopted by same states.
 Rule	Brazil	1992	only	-	Oct	25	 0:00	1:00	-
 Rule	Brazil	1993	only	-	Jan	31	 0:00	0	-
 # Decree 942  (1993-09-28)
 # adopted by same states, plus AM.
 # Decree 1,252  (1994-09-22;
 # web page corrected 2004-01-07) adopted by same states, minus AM.
 # Decree 1,636  (1995-09-14)
 # adopted by same states, plus MT and TO.
 # Decree 1,674  (1995-10-13)
 # adds AL, SE.
 Rule	Brazil	1993	1995	-	Oct	Sun>=11	 0:00	1:00	-
 Rule	Brazil	1994	1995	-	Feb	Sun>=15	 0:00	0	-
 Rule	Brazil	1996	only	-	Feb	11	 0:00	0	-
 # Decree 2,000  (1996-09-04)
 # adopted by same states, minus AL, SE.
 Rule	Brazil	1996	only	-	Oct	 6	 0:00	1:00	-
 Rule	Brazil	1997	only	-	Feb	16	 0:00	0	-
 # From Daniel C. Sobral (1998-02-12):
 # In 1997, the DS began on October 6. The stated reason was that
 # because international television networks ignored Brazil's policy on DS,
 # they bought the wrong times on satellite for coverage of Pope's visit.
 # This year, the ending date of DS was postponed to March 1
 # to help dealing with the shortages of electric power.
 #
 # Decree 2,317 (1997-09-04), adopted by same states.
 Rule	Brazil	1997	only	-	Oct	 6	 0:00	1:00	-
 # Decree 2,495 
 # (1998-02-10)
 Rule	Brazil	1998	only	-	Mar	 1	 0:00	0	-
 # Decree 2,780  (1998-09-11)
 # adopted by the same states as before.
 Rule	Brazil	1998	only	-	Oct	11	 0:00	1:00	-
 Rule	Brazil	1999	only	-	Feb	21	 0:00	0	-
 # Decree 3,150 
 # (1999-08-23) adopted by same states.
 # Decree 3,188  (1999-09-30)
 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
 Rule	Brazil	1999	only	-	Oct	 3	 0:00	1:00	-
 Rule	Brazil	2000	only	-	Feb	27	 0:00	0	-
 # Decree 3,592  (2000-09-06)
 # adopted by the same states as before.
 # Decree 3,630  (2000-10-13)
 # repeals DST in PE and RR, effective 2000-10-15 00:00.
 # Decree 3,632  (2000-10-17)
 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
 # Decree 3,916 
 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
 Rule	Brazil	2000	2001	-	Oct	Sun>=8	 0:00	1:00	-
 Rule	Brazil	2001	2006	-	Feb	Sun>=15	 0:00	0	-
 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
 # 4,399 
 Rule	Brazil	2002	only	-	Nov	 3	 0:00	1:00	-
 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO.
 # 4,844 
 Rule	Brazil	2003	only	-	Oct	19	 0:00	1:00	-
 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
 # 5,223 
 Rule	Brazil	2004	only	-	Nov	 2	 0:00	1:00	-
 # Decree 5,539  (2005-09-19),
 # adopted by the same states as before.
 Rule	Brazil	2005	only	-	Oct	16	 0:00	1:00	-
 # Decree 5,920  (2006-10-03),
 # adopted by the same states as before.
 Rule	Brazil	2006	only	-	Nov	 5	 0:00	1:00	-
 Rule	Brazil	2007	only	-	Feb	25	 0:00	0	-
 # Decree 6,212  (2007-09-26),
 # adopted by the same states as before.
 Rule	Brazil	2007	only	-	Oct	Sun>=8	 0:00	1:00	-
 # From Frederico A. C. Neves (2008-09-10):
 # According to this decree
 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
 # 3rd Feb Sunday. There is an exception on the return date when this is
 # the Carnival Sunday then the return date will be the next Sunday...
 Rule	Brazil	2008	2017	-	Oct	Sun>=15	0:00	1:00	-
 Rule	Brazil	2008	2011	-	Feb	Sun>=15	0:00	0	-
 # Decree 7,584  (2011-10-13)
 # added Bahia.
 Rule	Brazil	2012	only	-	Feb	Sun>=22	0:00	0	-
 # Decree 7,826  (2012-10-15)
 # removed Bahia and added Tocantins.
 # Decree 8,112  (2013-09-30)
 # removed Tocantins.
 Rule	Brazil	2013	2014	-	Feb	Sun>=15	0:00	0	-
 Rule	Brazil	2015	only	-	Feb	Sun>=22	0:00	0	-
 Rule	Brazil	2016	2019	-	Feb	Sun>=15	0:00	0	-
 # From Steffen Thorsen (2017-12-18):
 # According to many media sources, next year's DST start in Brazil will move to
 # the first Sunday of November
 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
 # From Steffen Thorsen (2017-12-20):
 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
 # From Fábio Gomes (2018-10-04):
 # The Brazilian president just announced a new change on this year DST.
 # It was scheduled to start on November 4th and it was changed to November 18th.
 # From Rodrigo Brüning Wessler (2018-10-15):
 # The Brazilian government just announced that the change in DST was
 # canceled....  Maybe the president Michel Temer also woke up one hour
 # earlier today. :)
 Rule	Brazil	2018	only	-	Nov	Sun>=1	0:00	1:00	-
 # The last ruleset listed above says that the following states observed DST:
 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
 #
 # From Steffen Thorsen (2019-04-05):
 # According to multiple sources the Brazilian president wants to get rid of DST.
 # https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano
 # https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml
 # From Marcus Diniz (2019-04-25):
 # Brazil no longer has DST changes - decree signed today
 # https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml
 # From Daniel Soares de Oliveira (2019-04-26):
 # http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 #
 # Fernando de Noronha (administratively part of PE)
 Zone America/Noronha	-2:09:40 -	LMT	1914
 			-2:00	Brazil	-02/-01	1990 Sep 17
 			-2:00	-	-02	1999 Sep 30
 			-2:00	Brazil	-02/-01	2000 Oct 15
 			-2:00	-	-02	2001 Sep 13
 			-2:00	Brazil	-02/-01	2002 Oct  1
 			-2:00	-	-02
 # Other Atlantic islands have no permanent settlement.
 # These include Trindade and Martim Vaz (administratively part of ES),
 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE).
 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01;
 # it also included the Penedos.
 #
 # Amapá (AP), east Pará (PA)
 # East Pará includes Belém, Marabá, Serra Norte, and São Félix do Xingu.
 # The division between east and west Pará is the river Xingu.
 # In the north a very small part from the river Javary (now Jari I guess,
 # the border with Amapá) to the Amazon, then to the Xingu.
 Zone America/Belem	-3:13:56 -	LMT	1914
 			-3:00	Brazil	-03/-02	1988 Sep 12
 			-3:00	-	-03
 #
 # west Pará (PA)
 # West Pará includes Altamira, Óbidos, Prainha, Oriximiná, and Santarém.
 Zone America/Santarem	-3:38:48 -	LMT	1914
 			-4:00	Brazil	-04/-03	1988 Sep 12
 			-4:00	-	-04	2008 Jun 24  0:00
 			-3:00	-	-03
 #
 # Maranhão (MA), Piauí (PI), Ceará (CE), Rio Grande do Norte (RN),
 # Paraíba (PB)
 Zone America/Fortaleza	-2:34:00 -	LMT	1914
 			-3:00	Brazil	-03/-02	1990 Sep 17
 			-3:00	-	-03	1999 Sep 30
 			-3:00	Brazil	-03/-02	2000 Oct 22
 			-3:00	-	-03	2001 Sep 13
 			-3:00	Brazil	-03/-02	2002 Oct  1
 			-3:00	-	-03
 #
 # Pernambuco (PE) (except Atlantic islands)
 Zone America/Recife	-2:19:36 -	LMT	1914
 			-3:00	Brazil	-03/-02	1990 Sep 17
 			-3:00	-	-03	1999 Sep 30
 			-3:00	Brazil	-03/-02	2000 Oct 15
 			-3:00	-	-03	2001 Sep 13
 			-3:00	Brazil	-03/-02	2002 Oct  1
 			-3:00	-	-03
 #
 # Tocantins (TO)
 Zone America/Araguaina	-3:12:48 -	LMT	1914
 			-3:00	Brazil	-03/-02	1990 Sep 17
 			-3:00	-	-03	1995 Sep 14
 			-3:00	Brazil	-03/-02	2003 Sep 24
 			-3:00	-	-03	2012 Oct 21
 			-3:00	Brazil	-03/-02	2013 Sep
 			-3:00	-	-03
 #
 # Alagoas (AL), Sergipe (SE)
 Zone America/Maceio	-2:22:52 -	LMT	1914
 			-3:00	Brazil	-03/-02	1990 Sep 17
 			-3:00	-	-03	1995 Oct 13
 			-3:00	Brazil	-03/-02	1996 Sep  4
 			-3:00	-	-03	1999 Sep 30
 			-3:00	Brazil	-03/-02	2000 Oct 22
 			-3:00	-	-03	2001 Sep 13
 			-3:00	Brazil	-03/-02	2002 Oct  1
 			-3:00	-	-03
 #
 # Bahia (BA)
 # There are too many Salvadors elsewhere, so use America/Bahia instead
 # of America/Salvador.
 Zone America/Bahia	-2:34:04 -	LMT	1914
 			-3:00	Brazil	-03/-02	2003 Sep 24
 			-3:00	-	-03	2011 Oct 16
 			-3:00	Brazil	-03/-02	2012 Oct 21
 			-3:00	-	-03
 #
 # Goiás (GO), Distrito Federal (DF), Minas Gerais (MG),
 # Espírito Santo (ES), Rio de Janeiro (RJ), São Paulo (SP), Paraná (PR),
 # Santa Catarina (SC), Rio Grande do Sul (RS)
 Zone America/Sao_Paulo	-3:06:28 -	LMT	1914
 			-3:00	Brazil	-03/-02	1963 Oct 23  0:00
 			-3:00	1:00	-02	1964
 			-3:00	Brazil	-03/-02
 #
 # Mato Grosso do Sul (MS)
 Zone America/Campo_Grande -3:38:28 -	LMT	1914
 			-4:00	Brazil	-04/-03
 #
 # Mato Grosso (MT)
 Zone America/Cuiaba	-3:44:20 -	LMT	1914
 			-4:00	Brazil	-04/-03	2003 Sep 24
 			-4:00	-	-04	2004 Oct  1
 			-4:00	Brazil	-04/-03
 #
 # Rondônia (RO)
 Zone America/Porto_Velho -4:15:36 -	LMT	1914
 			-4:00	Brazil	-04/-03	1988 Sep 12
 			-4:00	-	-04
 #
 # Roraima (RR)
 Zone America/Boa_Vista	-4:02:40 -	LMT	1914
 			-4:00	Brazil	-04/-03	1988 Sep 12
 			-4:00	-	-04	1999 Sep 30
 			-4:00	Brazil	-04/-03	2000 Oct 15
 			-4:00	-	-04
 #
 # east Amazonas (AM): Boca do Acre, Jutaí, Manaus, Floriano Peixoto
 # The great circle line from Tabatinga to Porto Acre divides
 # east from west Amazonas.
 Zone America/Manaus	-4:00:04 -	LMT	1914
 			-4:00	Brazil	-04/-03	1988 Sep 12
 			-4:00	-	-04	1993 Sep 28
 			-4:00	Brazil	-04/-03	1994 Sep 22
 			-4:00	-	-04
 #
 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
 #	Eirunepé, Envira, Ipixuna
 Zone America/Eirunepe	-4:39:28 -	LMT	1914
 			-5:00	Brazil	-05/-04	1988 Sep 12
 			-5:00	-	-05	1993 Sep 28
 			-5:00	Brazil	-05/-04	1994 Sep 22
 			-5:00	-	-05	2008 Jun 24  0:00
 			-4:00	-	-04	2013 Nov 10
 			-5:00	-	-05
 #
 # Acre (AC)
 Zone America/Rio_Branco	-4:31:12 -	LMT	1914
 			-5:00	Brazil	-05/-04	1988 Sep 12
 			-5:00	-	-05	2008 Jun 24  0:00
 			-4:00	-	-04	2013 Nov 10
 			-5:00	-	-05
 
 # Chile
 
 # From Paul Eggert (2022-03-15):
 # Shanks & Pottenger says America/Santiago introduced standard time in
 # 1890 and rounds its UT offset to 70W40; guess that in practice this
 # was the same offset as in 1916-1919.  It also says Pacific/Easter
 # standardized on 109W22 in 1890; assume this didn't change the clocks.
 #
 # Dates for America/Santiago from 1910 to 2004 are primarily from
 # the following source, cited by Oscar van Vlijmen (2006-10-08):
 # [1] Chile Law
 # http://www.webexhibits.org/daylightsaving/chile.html
 # This contains a copy of this official table:
 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
 # [1] needs several corrections, though.
 #
 # The first set of corrections is from:
 # [2] History of the Official Time of Chile
 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06).  See:
 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
 # This is an English translation of:
 # Historia de la hora oficial de Chile (retrieved 2012-10-24).  See:
 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
 # A fancier Spanish version (requiring mouse-clicking) is at:
 # http://www.horaoficial.cl/historia_hora.php
 # Conflicts between [1] and [2] were resolved as follows:
 #
 #  - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
 #    Boletín No. 1, Aviso No. 1 (1910).  Go with [2].
 #
 #  - [1] says SMT was -4:42:45, [2] says Chile's official time from
 #    1916 to 1919 was -4:42:46.3, the meridian of Chile's National
 #    Astronomical Observatory (OAN), then located in what is now
 #    Quinta Normal in Santiago.  Go with [1], as this matches the meridian
 #    referred to by the relevant Chilean laws to this day.
 #
 #  - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
 #    Boletín No. 22, Aviso No. 129/1918 (1918-08-23).  Go with [2].
 #
 #  - [1] does not give times for transitions; assume they occur
 #    at midnight mainland time, the current common practice.  However,
 #    go with [2]'s specification of 23:00 for the 1947-05-21 transition.
 #
 # Another correction to [1] is from Jesper Nørgaard Welen, who
 # wrote (2006-10-08), "I think that there are some obvious mistakes in
 # the suggested link from Oscar van Vlijmen,... for instance entry 66
 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
 # respectively), but anyhow it clears up some doubts too."
 #
 # Data for Pacific/Easter from 1910 through 1967 come from Shanks &
 # Pottenger.  After that, for lack of better info assume
 # Pacific/Easter is always two hours behind America/Santiago;
 # this is known to work for DST transitions starting in 2008 and
 # may well be true for earlier transitions.
 
 # From Tim Parenti (2022-07-06):
 # For a brief period of roughly six weeks in 1946, DST was only observed on an
 # emergency basis in specific regions of central Chile; namely, "the national
 # territory between the provinces of Coquimbo and Concepción, inclusive".
 # This was enacted by Decree 3,891, dated 1946-07-13, and took effect
 # 1946-07-14 24:00, advancing these central regions to -03.
 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1
 # The decree contemplated "[t]hat this advancement of the Official Time, even
 # though it has been proposed for the cities of Santiago and Valparaíso only,
 # must be agreed with that of other cities, due to the connection of various
 # activities that require it, such as, for example, the operation of rail
 # services".  It was originally set to expire after 30 days but was extended
 # through 1946-08-31 by Decree 4,506, dated 1946-08-13.
 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1
 #
 # Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their
 # new "Summer Time" of -04, reckoned as that of "the meridian of the
 # Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45
 # seconds".  Although this law specified the new Summer Time to start on 1
 # September each year, a special "transitional article" started it a few days
 # early, as soon as the law took effect.  As the law was to take force "from
 # the date of its publication in the 'Diario Oficial', which happened the
 # following day, presume the change took place in Santiago and its environs
 # from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28.  Although this was a
 # no-op for wall clocks in the north and south of the country, put their formal
 # start to DST an hour later when they reached 24:00 -04.
 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1
 # After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number
 # 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the
 # second day after it is published in the 'Diario Oficial'."  It was published
 # on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00.
 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1
 
 # From Eduardo Krell (1995-10-19):
 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
 # of October....  The law is the same for March and October.
 # (1998-09-29):
 # Because of the drought this year, the government decided to go into
 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
 # (unless there's another dry season next year, I guess).
 
 # From Julio I. Pacheco Troncoso (1999-03-18):
 # Because of the same drought, the government decided to end DST later,
 # on April 3, (one-time change).
 
 # From Germán Poo-Caamaño (2008-03-03):
 # Due to drought, Chile extends Daylight Time in three weeks.  This
 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago
 # and Saturday 3/29 at 22:00 for Pacific/Easter)
 # The Supreme Decree is located at
 # http://www.shoa.cl/servicios/supremo316.pdf
 #
 # From José Miguel Garrido (2008-03-05):
 # http://www.shoa.cl/noticias/2008/04hora/hora.htm
 
 # From Angel Chiang (2010-03-04):
 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake
 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
 #
 # From Arthur David Olson (2010-03-06):
 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
 
 # From Glenn Eychaner (2011-03-28):
 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
 # In English:
 # Chile's clocks will go back an hour this year on the 7th of May instead
 # of this Saturday. They will go forward again the 3rd Saturday in
 # August, not in October as they have since 1968.
 
 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
 # As stated in the website of the Chilean Energy Ministry
 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
 # The Chilean Government has decided to postpone the entrance into winter time
 # (to leave DST) from March 11 2012 to April 28th 2012....
 # Quote from the website communication:
 #
 # 6. For the year 2012, the dates of entry into winter time will be as follows:
 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
 # of the same day.
 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
 # 01:00 on September 2.
 
 # From Steffen Thorsen (2013-02-15):
 # According to several news sources, Chile has extended DST this year,
 # they will end DST later and start DST earlier than planned.  They
 # hope to save energy.  The new end date is 2013-04-28 00:00 and new
 # start date is 2013-09-08 00:00....
 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm
 
 # From José Miguel Garrido (2014-02-19):
 # Today appeared in the Diario Oficial a decree amending the time change
 # dates to 2014.
 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf
 
 # From Eduardo Romero Urra (2015-03-03):
 # Today has been published officially that Chile will use the DST time
 # permanently until March 25 of 2017
 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
 #
 # From Paul Eggert (2015-03-03):
 # For now, assume that the extension will persist indefinitely.
 
 # From Juan Correa (2016-03-18):
 # The decree regarding DST has been published in today's Official Gazette:
 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
 # http://www.leychile.cl/Navegar?idNorma=1088502
 # It does consider the second Saturday of May and August as the dates
 # for the transition; and it lists DST dates until 2019, but I think
 # this scheme will stick.
 #
 # From Paul Eggert (2016-03-18):
 # For now, assume the pattern holds for the indefinite future.
 # The decree says transitions occur at 24:00; in practice this appears
 # to mean 24:00 mainland time, not 24:00 local time, so that Easter
 # Island is always two hours behind the mainland.
 
 # From Juan Correa (2016-12-04):
 # Magallanes region ... will keep DST (UTC -3) all year round....
 # http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-el-decreto-para-establecer-un-horario-unico-para-la-Region-de-Magallanes.aspx
 # From Deborah Goldsmith (2017-01-19):
 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
 
 # From Juan Correa (2018-08-13):
 # As of moments ago, the Ministry of Energy in Chile has announced the new
 # schema for DST. ...  Announcement in video (in Spanish):
 # https://twitter.com/MinEnergia/status/1029000399129374720
 # From Yonathan Dossow (2018-08-13):
 # The video says "first Saturday of September", we all know it means Sunday at
 # midnight.
 # From Tim Parenti (2018-08-13):
 # Translating the captions on the video at 0:44-0:55, "We want to announce as
 # Government that from 2019, Winter Time will be increased to 5 months, between
 # the first Saturday of April and the first Saturday of September."
 # At 2:08-2:20, "The Magallanes region will maintain its current time, as
 # decided by the citizens during 2017, but our Government will promote a
 # regional dialogue table to gather their opinion on this matter."
 # https://twitter.com/MinEnergia/status/1029009354001973248
 # "We will keep the new time policy unchanged for at least the next 4 years."
 # So we extend the new rules on Saturdays at 24:00 mainland time indefinitely.
 # From Juan Correa (2019-02-04):
 # http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf
 
 # From Juan Correa (2022-04-02):
 # I found there was a decree published last Thursday that will keep
 # Magallanes region to UTC -3 "indefinitely". The decree is available at
 # https://www.diariooficial.interior.gob.cl/publicaciones/2022/03/31/43217-B/01/2108910.pdf
 
 # From Juan Correa (2022-08-09):
 # the Internal Affairs Ministry (Ministerio del Interior) informed DST
 # for America/Santiago will start on midnight of September 11th;
 # and will end on April 1st, 2023. Magallanes region (America/Punta_Arenas)
 # will keep UTC -3 "indefinitely"...  This is because on September 4th
 # we will have a voting whether to approve a new Constitution.
 #
 # From Eduardo Romero Urra (2022-08-17):
 # https://www.diariooficial.interior.gob.cl/publicaciones/2022/08/13/43327/01/2172567.pdf
 #
 # From Paul Eggert (2022-08-17):
 # Although the presidential decree stops at fall 2026, assume that
 # similar DST rules will continue thereafter.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Chile	1927	1931	-	Sep	 1	0:00	1:00	-
 Rule	Chile	1928	1932	-	Apr	 1	0:00	0	-
 Rule	Chile	1968	only	-	Nov	 3	4:00u	1:00	-
 Rule	Chile	1969	only	-	Mar	30	3:00u	0	-
 Rule	Chile	1969	only	-	Nov	23	4:00u	1:00	-
 Rule	Chile	1970	only	-	Mar	29	3:00u	0	-
 Rule	Chile	1971	only	-	Mar	14	3:00u	0	-
 Rule	Chile	1970	1972	-	Oct	Sun>=9	4:00u	1:00	-
 Rule	Chile	1972	1986	-	Mar	Sun>=9	3:00u	0	-
 Rule	Chile	1973	only	-	Sep	30	4:00u	1:00	-
 Rule	Chile	1974	1987	-	Oct	Sun>=9	4:00u	1:00	-
 Rule	Chile	1987	only	-	Apr	12	3:00u	0	-
 Rule	Chile	1988	1990	-	Mar	Sun>=9	3:00u	0	-
 Rule	Chile	1988	1989	-	Oct	Sun>=9	4:00u	1:00	-
 Rule	Chile	1990	only	-	Sep	16	4:00u	1:00	-
 Rule	Chile	1991	1996	-	Mar	Sun>=9	3:00u	0	-
 Rule	Chile	1991	1997	-	Oct	Sun>=9	4:00u	1:00	-
 Rule	Chile	1997	only	-	Mar	30	3:00u	0	-
 Rule	Chile	1998	only	-	Mar	Sun>=9	3:00u	0	-
 Rule	Chile	1998	only	-	Sep	27	4:00u	1:00	-
 Rule	Chile	1999	only	-	Apr	 4	3:00u	0	-
 Rule	Chile	1999	2010	-	Oct	Sun>=9	4:00u	1:00	-
 Rule	Chile	2000	2007	-	Mar	Sun>=9	3:00u	0	-
 # N.B.: the end of March 29 in Chile is March 30 in Universal time,
 # which is used below in specifying the transition.
 Rule	Chile	2008	only	-	Mar	30	3:00u	0	-
 Rule	Chile	2009	only	-	Mar	Sun>=9	3:00u	0	-
 Rule	Chile	2010	only	-	Apr	Sun>=1	3:00u	0	-
 Rule	Chile	2011	only	-	May	Sun>=2	3:00u	0	-
 Rule	Chile	2011	only	-	Aug	Sun>=16	4:00u	1:00	-
 Rule	Chile	2012	2014	-	Apr	Sun>=23	3:00u	0	-
 Rule	Chile	2012	2014	-	Sep	Sun>=2	4:00u	1:00	-
 Rule	Chile	2016	2018	-	May	Sun>=9	3:00u	0	-
 Rule	Chile	2016	2018	-	Aug	Sun>=9	4:00u	1:00	-
 Rule	Chile	2019	max	-	Apr	Sun>=2	3:00u	0	-
 Rule	Chile	2019	2021	-	Sep	Sun>=2	4:00u	1:00	-
 Rule	Chile	2022	only	-	Sep	Sun>=9	4:00u	1:00	-
 Rule	Chile	2023	max	-	Sep	Sun>=2	4:00u	1:00	-
 # IATA SSIM anomalies: (1992-02) says 1992-03-14;
 # (1996-09) says 1998-03-08.  Ignore these.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Santiago	-4:42:45 -	LMT	1890
 			-4:42:45 -	SMT	1910 Jan 10 # Santiago Mean Time
 			-5:00	-	-05	1916 Jul  1
 			-4:42:45 -	SMT	1918 Sep 10
 			-4:00	-	-04	1919 Jul  1
 			-4:42:45 -	SMT	1927 Sep  1
 			-5:00	Chile	-05/-04	1932 Sep  1
 			-4:00	-	-04	1942 Jun  1
 			-5:00	-	-05	1942 Aug  1
 			-4:00	-	-04	1946 Jul 14 24:00
 			-4:00	1:00	-03	1946 Aug 28 24:00 # central CL
 			-5:00	1:00	-04	1947 Mar 31 24:00
 			-5:00	-	-05	1947 May 21 23:00
 			-4:00	Chile	-04/-03
 Zone America/Punta_Arenas -4:43:40 -	LMT	1890
 			-4:42:45 -	SMT	1910 Jan 10
 			-5:00	-	-05	1916 Jul  1
 			-4:42:45 -	SMT	1918 Sep 10
 			-4:00	-	-04	1919 Jul  1
 			-4:42:45 -	SMT	1927 Sep  1
 			-5:00	Chile	-05/-04	1932 Sep  1
 			-4:00	-	-04	1942 Jun  1
 			-5:00	-	-05	1942 Aug  1
 			-4:00	-	-04	1946 Aug 28 24:00
 			-5:00	1:00	-04	1947 Mar 31 24:00
 			-5:00	-	-05	1947 May 21 23:00
 			-4:00	Chile	-04/-03	2016 Dec  4
 			-3:00	-	-03
 Zone Pacific/Easter	-7:17:28 -	LMT	1890
 			-7:17:28 -	EMT	1932 Sep    # Easter Mean Time
 			-7:00	Chile	-07/-06	1982 Mar 14 3:00u # Easter Time
 			-6:00	Chile	-06/-05
 #
 # Salas y Gómez Island is uninhabited.
 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is,
 # and Antarctic bases, are like America/Santiago.
 
 # Antarctic base using South American rules
 # (See the file 'antarctica' for more.)
 #
 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
 #
 # From Ethan Dicks (1996-10-06):
 # It keeps the same time as Punta Arenas, Chile, because, just like us
 # and the South Pole, that's the other end of their supply line....
 # I verified with someone who was there that since 1980,
 # Palmer has followed Chile.  Prior to that, before the Falklands War,
 # Palmer used to be supplied from Argentina.
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Antarctica/Palmer	0	-	-00	1965
 			-4:00	Arg	-04/-03	1969 Oct  5
 			-3:00	Arg	-03/-02	1982 May
 			-4:00	Chile	-04/-03	2016 Dec  4
 			-3:00	-	-03
 
 # Colombia
 
 # Milne gives 4:56:16.4 for Bogotá time in 1899.  He writes,
 # "A variation of fifteen minutes in the public clocks of Bogota is not rare."
 
+# From Alois Treindl (2022-11-10):
+# End of time change in Colombia 1993 ... should be 6 February 24h ...
+# DECRETO 267 DE 1993
+# https://www.suin-juriscol.gov.co/viewDocument.asp?ruta=Decretos/1061335
+
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
-Rule	CO	1992	only	-	May	 3	0:00	1:00	-
-Rule	CO	1993	only	-	Apr	 4	0:00	0	-
+Rule	CO	1992	only	-	May	 3	 0:00	1:00	-
+Rule	CO	1993	only	-	Feb	 6	24:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 		#STDOFF	-4:56:16.4
 Zone	America/Bogota	-4:56:16 -	LMT	1884 Mar 13
 			-4:56:16 -	BMT	1914 Nov 23 # Bogotá Mean Time
 			-5:00	CO	-05/-04
 # Malpelo, Providencia, San Andres
 # no information; probably like America/Bogota
 
 
 # Ecuador
 #
 # Milne says the Central and South American Telegraph Company used -5:24:15.
 #
 # From Alois Treindl (2016-12-15):
 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html
 # ... Whether the law applied also to Galápagos, I do not know.
 # From Paul Eggert (2016-12-15):
 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html
 # This says President Sixto Durán Ballén signed decree No. 285, which
 # established DST from 1992-11-28 to 1993-02-05; it does not give transition
 # times.  The people called it "hora de Sixto" ("Sixto hour").  The change did
 # not go over well; a popular song "Qué hora es" by Jaime Guevara had lyrics
 # that included "Amanecía en mitad de la noche, los guaguas iban a clase sin
 # sol" ("It was dawning in the middle of the night, the buses went to class
 # without sun").  Although Ballén's campaign slogan was "Ni un paso atrás"
 # (Not one step back), the clocks went back in 1993 and the experiment was not
 # repeated.  For now, assume transitions were at 00:00 local time country-wide.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Ecuador	1992	only	-	Nov	28	0:00	1:00	-
 Rule	Ecuador	1993	only	-	Feb	 5	0:00	0	-
 #
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Guayaquil	-5:19:20 -	LMT	1890
 			-5:14:00 -	QMT	1931 # Quito Mean Time
 			-5:00	Ecuador	-05/-04
 Zone Pacific/Galapagos	-5:58:24 -	LMT	1931 # Puerto Baquerizo Moreno
 			-5:00	-	-05	1986
 			-6:00	Ecuador	-06/-05
 
 # Falklands
 
 # From Paul Eggert (2006-03-22):
 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except
 # the IATA gives 1996-09-08.  Go with Shanks & Pottenger.
 
 # From Falkland Islands Government Office, London (2001-01-22)
 # via Jesper Nørgaard:
 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
 # September.  It is anticipated that the clocks will revert back at 2
 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
 # Sunday 1 September.
 
 # From Rives McDow (2001-02-13):
 #
 # I have communicated several times with people there, and the last
 # time I had communications that was helpful was in 1998.  Here is
 # what was said then:
 #
 # "The general rule was that Stanley used daylight saving and the Camp
 # did not. However for various reasons many people in the Camp have
 # started to use daylight saving (known locally as 'Stanley Time')
 # There is no rule as to who uses daylight saving - it is a matter of
 # personal choice and so it is impossible to draw a map showing who
 # uses it and who does not. Any list would be out of date as soon as
 # it was produced. This year daylight saving ended on April 18/19th
 # and started again on September 12/13th.  I do not know what the rule
 # is, but can find out if you like.  We do not change at the same time
 # as UK or Chile."
 #
 # I did have in my notes that the rule was "Second Saturday in Sep at
 # 0:00 until third Saturday in Apr at 0:00".  I think that this does
 # not agree in some cases with Shanks; is this true?
 #
 # Also, there is no mention in the list that some areas in the
 # Falklands do not use DST.  I have found in my communications there
 # that these areas are on the western half of East Falkland and all of
 # West Falkland.  Stanley is the only place that consistently observes
 # DST.  Again, as in other places in the world, the farmers don't like
 # it.  West Falkland is almost entirely sheep farmers.
 #
 # I know one lady there that keeps a list of which farm keeps DST and
 # which doesn't each year.  She runs a shop in Stanley, and says that
 # the list changes each year.  She uses it to communicate to her
 # customers, catching them when they are home for lunch or dinner.
 
 # From Paul Eggert (2001-03-05):
 # For now, we'll just record the time in Stanley, since we have no
 # better info.
 
 # From Steffen Thorsen (2011-04-01):
 # The Falkland Islands will not turn back clocks this winter, but stay on
 # daylight saving time.
 #
 # One source:
 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
 #
 # We have gotten this confirmed by a clerk of the legislative assembly:
 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
 # hours) on the first Sunday of September at 0200hrs.
 #
 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
 # will not revert to local mean time, but clocks will remain on Summer
 # time (UTC/GMT - 3 hours) throughout the whole of 2011.  Any long term
 # change to local time following the trial period will be notified.
 #
 # From Andrew Newman (2012-02-24)
 # A letter from Justin McPhee, Chief Executive,
 # Cable & Wireless Falkland Islands (dated 2012-02-22)
 # states...
 #   The current Atlantic/Stanley entry under South America expects the
 #   clocks to go back to standard Falklands Time (FKT) on the 15th April.
 #   The database entry states that in 2011 Stanley was staying on fixed
 #   summer time on a trial basis only.  FIG need to contact IANA and/or
 #   the maintainers of the database to inform them we're adopting
 #   the same policy this year and suggest recommendations for future years.
 #
 # For now we will assume permanent -03 for the Falklands
 # until advised differently (to apply for 2012 and beyond, after the 2011
 # experiment was apparently successful.)
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Falk	1937	1938	-	Sep	lastSun	0:00	1:00	-
 Rule	Falk	1938	1942	-	Mar	Sun>=19	0:00	0	-
 Rule	Falk	1939	only	-	Oct	1	0:00	1:00	-
 Rule	Falk	1940	1942	-	Sep	lastSun	0:00	1:00	-
 Rule	Falk	1943	only	-	Jan	1	0:00	0	-
 Rule	Falk	1983	only	-	Sep	lastSun	0:00	1:00	-
 Rule	Falk	1984	1985	-	Apr	lastSun	0:00	0	-
 Rule	Falk	1984	only	-	Sep	16	0:00	1:00	-
 Rule	Falk	1985	2000	-	Sep	Sun>=9	0:00	1:00	-
 Rule	Falk	1986	2000	-	Apr	Sun>=16	0:00	0	-
 Rule	Falk	2001	2010	-	Apr	Sun>=15	2:00	0	-
 Rule	Falk	2001	2010	-	Sep	Sun>=1	2:00	1:00	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/Stanley	-3:51:24 -	LMT	1890
 			-3:51:24 -	SMT	1912 Mar 12 # Stanley Mean Time
 			-4:00	Falk	-04/-03	1983 May
 			-3:00	Falk	-03/-02	1985 Sep 15
 			-4:00	Falk	-04/-03	2010 Sep  5  2:00
 			-3:00	-	-03
 
 # French Guiana
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Cayenne	-3:29:20 -	LMT	1911 Jul
 			-4:00	-	-04	1967 Oct
 			-3:00	-	-03
 
 # Guyana
 
 # From P Chan (2020-11-27):
 # https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547
 # The Official Gazette of British Guiana. (New Series.) Vol. XL. July to
 # December, 1915, p 1547, lists as several notes:
 # "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time
 # (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4
 # hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July,
 # 1911.  From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45
 # mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on
 # 23rd January, 1915."
 #
 # https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf
 # Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975)
 # [dated 1975-07-31]
 # "This Act...shall come into operation on 1st August, 1975."
 # "...where any expression of time occurs...the time referred to shall signify
 # the standard time of Guyana which shall be three hours behind Greenwich Mean
 # Time."
 #
 # Circular No. 10/1992 dated 1992-03-20
 # https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf
 # "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana
 # Standard Time would be re-established at 01:00 hours by adjusting the hands
 # of the clock back to 24:00 hours."
 # Legislated in the Interpretation and general clauses (Amendment) Act 1992
 # (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18]
 # https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Guyana	-3:52:39 -	LMT	1911 Aug  1 # Georgetown
 			-4:00	-	-04	1915 Mar  1
 			-3:45	-	-0345	1975 Aug  1
 			-3:00	-	-03	1992 Mar 29  1:00
 			-4:00	-	-04
 
 # Paraguay
 #
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00,
 # and autumn transitions are 00:00 -> 23:00.  Go with pre-1999
 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
 #
 # From Waldemar Villamayor-Venialbo (2013-09-20):
 # No time of the day is established for the adjustment, so people normally
 # adjust their clocks at 0 hour of the given dates.
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Para	1975	1988	-	Oct	 1	0:00	1:00	-
 Rule	Para	1975	1978	-	Mar	 1	0:00	0	-
 Rule	Para	1979	1991	-	Apr	 1	0:00	0	-
 Rule	Para	1989	only	-	Oct	22	0:00	1:00	-
 Rule	Para	1990	only	-	Oct	 1	0:00	1:00	-
 Rule	Para	1991	only	-	Oct	 6	0:00	1:00	-
 Rule	Para	1992	only	-	Mar	 1	0:00	0	-
 Rule	Para	1992	only	-	Oct	 5	0:00	1:00	-
 Rule	Para	1993	only	-	Mar	31	0:00	0	-
 Rule	Para	1993	1995	-	Oct	 1	0:00	1:00	-
 Rule	Para	1994	1995	-	Feb	lastSun	0:00	0	-
 Rule	Para	1996	only	-	Mar	 1	0:00	0	-
 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
 # From Steffen Thorsen (2000-10-02):
 # I have three independent reports that Paraguay changed to DST this Sunday
 # (10-01).
 #
 # Translated by Gwillim Law (2001-02-27) from
 # Noticias, a daily paper in Asunción, Paraguay (2000-10-01):
 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm
 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
 # fulfillment of Decree No. 7,273 of the Executive Power....  The time change
 # system has been operating for several years.  Formerly there was a separate
 # decree each year; the new law has the same effect, but permanently.  Every
 # year, the time will change on the first Sunday of October; likewise, the
 # clock will be set back on the first Sunday of March.
 #
 Rule	Para	1996	2001	-	Oct	Sun>=1	0:00	1:00	-
 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger.
 Rule	Para	1997	only	-	Feb	lastSun	0:00	0	-
 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
 Rule	Para	1998	2001	-	Mar	Sun>=1	0:00	0	-
 # From Rives McDow (2002-02-28):
 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the
 # dst method to be from the first Sunday in September to the first Sunday in
 # April.
 Rule	Para	2002	2004	-	Apr	Sun>=1	0:00	0	-
 Rule	Para	2002	2003	-	Sep	Sun>=1	0:00	1:00	-
 #
 # From Jesper Nørgaard Welen (2005-01-02):
 # There are several sources that claim that Paraguay made
 # a timezone rule change in autumn 2004.
 # From Steffen Thorsen (2005-01-05):
 # Decree 1,867 (2004-03-05)
 # From Carlos Raúl Perasso via Jesper Nørgaard Welen (2006-10-13)
 # http://www.presidencia.gov.py/decretos/D1867.pdf
 Rule	Para	2004	2009	-	Oct	Sun>=15	0:00	1:00	-
 Rule	Para	2005	2009	-	Mar	Sun>=8	0:00	0	-
 # From Carlos Raúl Perasso (2010-02-18):
 # By decree number 3958 issued yesterday
 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
 # Paraguay changes its DST schedule, postponing the March rule to April and
 # modifying the October date. The decree reads:
 # ...
 # Art. 1. It is hereby established that from the second Sunday of the month of
 # April of this year (2010), the official time is to be set back 60 minutes,
 # and that on the first Sunday of the month of October, it is to be set
 # forward 60 minutes, in all the territory of the Paraguayan Republic.
 # ...
 Rule	Para	2010	max	-	Oct	Sun>=1	0:00	1:00	-
 Rule	Para	2010	2012	-	Apr	Sun>=8	0:00	0	-
 #
 # From Steffen Thorsen (2013-03-07):
 # Paraguay will end DST on 2013-03-24 00:00....
 # http://www.ande.gov.py/interna.php?id=1075
 #
 # From Carlos Raúl Perasso (2013-03-15):
 # The change in Paraguay is now final.  Decree number 10780
 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf
 # From Carlos Raúl Perasso (2014-02-28):
 # Decree 1264 can be found at:
 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
 Rule	Para	2013	max	-	Mar	Sun>=22	0:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Asuncion	-3:50:40 -	LMT	1890
 			-3:50:40 -	AMT	1931 Oct 10 # Asunción Mean Time
 			-4:00	-	-04	1972 Oct
 			-3:00	-	-03	1974 Apr
 			-4:00	Para	-04/-03
 
 # Peru
 #
 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
 # :
 # When we were in Peru in 1985-1986, they apparently switched over
 # sometime between December 29 and January 3 while we were on the Amazon.
 #
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger don't have this transition.  Assume 1986 was like 1987.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Peru	1938	only	-	Jan	 1	0:00	1:00	-
 Rule	Peru	1938	only	-	Apr	 1	0:00	0	-
 Rule	Peru	1938	1939	-	Sep	lastSun	0:00	1:00	-
 Rule	Peru	1939	1940	-	Mar	Sun>=24	0:00	0	-
 Rule	Peru	1986	1987	-	Jan	 1	0:00	1:00	-
 Rule	Peru	1986	1987	-	Apr	 1	0:00	0	-
 Rule	Peru	1990	only	-	Jan	 1	0:00	1:00	-
 Rule	Peru	1990	only	-	Apr	 1	0:00	0	-
 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger.
 Rule	Peru	1994	only	-	Jan	 1	0:00	1:00	-
 Rule	Peru	1994	only	-	Apr	 1	0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Lima	-5:08:12 -	LMT	1890
 			-5:08:36 -	LMT	1908 Jul 28 # Lima Mean Time?
 			-5:00	Peru	-05/-04
 
 # South Georgia
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/South_Georgia -2:26:08 -	LMT	1890 # Grytviken
 			-2:00	-	-02
 
 # South Sandwich Is
 # uninhabited; scientific personnel have wintered
 
 # Suriname
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Paramaribo	-3:40:40 -	LMT	1911
 			-3:40:52 -	PMT	1935     # Paramaribo Mean Time
 			-3:40:36 -	PMT	1945 Oct    # The capital moved?
 			-3:30	-	-0330	1984 Oct
 			-3:00	-	-03
 
 # Uruguay
 # From Paul Eggert (1993-11-18):
 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
 #
 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael
 # Deckers (2018-02-20):
 # ... At least they kept good records...
 #
 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36
 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and
 # Meteorology Service of the Uruguayan Navy, seems to give many transitions
 # with greater clarity than we've had before.  It directly references many laws
 # and decrees which are, in turn, referenced below.  They can be viewed in the
 # public archives of the Diario Oficial (in Spanish) at
 # http://www.impo.com.uy/diariooficial/
 #
 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the
 # auspices of the National Institute for the Prediction of Time.  It is unclear
 # exactly what offset was used during this period, though Ley No. 7200 of
 # 1920-04-23 used the Observatory of the National Meteorological Institute in
 # Montevideo (34° 54' 33" S, 56° 12' 45" W) as its reference meridian,
 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00,
 # resulting in UT-04.  Assume the corresponding LMT of UT-03:44:51 (given on
 # page 725 of the Proceedings of the Second Pan-American Scientific Congress,
 # 1915-1916) was in use, and merely became official from 1908-06-10.
 # https://www.impo.com.uy/diariooficial/1908/06/18/12
 # https://www.impo.com.uy/diariooficial/1920/04/27/9
 #
 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced
 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14
 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the
 # National Council of Administration the same day, published directly below the
 # law in the Diario Oficial, specified the first transition to be 1923-09-30
 # 24:00.  This effectively established standard time at UT-03:30 with 30
 # minutes DST.  Assume transitions at 24:00 on the specified days until Ley No.
 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other
 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolución
 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it
 # would have been under the previous law.
 # https://www.impo.com.uy/diariooficial/1923/07/02/2
 # https://www.impo.com.uy/diariooficial/1926/03/10/2
 # https://www.impo.com.uy/diariooficial/1926/03/18/2
 #
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Uruguay	1923	1925	-	Oct	 1	 0:00	0:30	-
 Rule	Uruguay	1924	1926	-	Apr	 1	 0:00	0	-
 # From Tim Parenti (2018-02-15):
 # http://www.impo.com.uy/diariooficial/1933/10/27/6
 #
 # It appears Ley No. 9122 of 1933 was never published as such in the Diario
 # Oficial, but instead appeared as Document 26 in the Diario on Friday
 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of
 # National Defense.  It reinstituted a DST of 30 minutes (to UT-03) "from the
 # last Sunday of October...until the last Saturday of March."  In accordance
 # with this provision, the first transition was explicitly specified in Article
 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29
 # at 00:00.  Assume transitions at 00:00 Sunday throughout.
 #
 # Departing from the matter-of-fact nature of previous timekeeping laws, the
 # 1933 decree "consider[s] the advantages of...the advance of legal time":
 #
 #   "Whereas: The measure adopted by almost all nations at the time of the last
 #    World War still persists in North America and Europe, precisely because of
 #    the economic, hygienic, and social advantages derived from such an
 #    emergency measure...
 #
 #    Whereas: The advance of the legal time during the summer seasons, by
 #    displacing social activity near sunrise, favors the citizen populations
 #    and especially the society that creates and works..."
 #
 # It further specified that "necessary measures" be taken to ensure that
 # "public spectacles finish, in general, before [01:00]."
 Rule	Uruguay	1933	1938	-	Oct	lastSun	 0:00	0:30	-
 Rule	Uruguay	1934	1941	-	Mar	lastSat	24:00	0	-
 # From Tim Parenti (2018-02-15):
 # Most of the Rules below, and their contemporaneous Zone lines, have been
 # updated simply to match the Almanaque 2018.  Although the document does not
 # list exact transition times, midnight transitions were already present in our
 # data here for all transitions through 2004-09, and this is both consistent
 # with prior transitions and verified in several decrees marked below between
 # 1939-09 and 2004-09, wherein the relevant text was typically of the form:
 #
 #   "From 0 hours on [date], the legal time of the entire Republic will be...
 #
 #    In accordance with [the preceding], on [previous date] at 24 hours, all
 #    clocks throughout the Republic will be [advanced/retarded] by..."
 #
 # It is possible that there is greater specificity to be found for the Rules
 # below, but it is buried in no fewer than 40 different decrees individually
 # referenced by the Almanaque for the period from 1939-09 to 2014-09.
 # Four-fifths of these were promulgated less than two weeks before taking
 # effect; more than half within a week and none more than 5 weeks.  Only the
 # handful with comments below have been checked with any thoroughness.
 Rule	Uruguay	1939	only	-	Oct	 1	 0:00	0:30	-
 Rule	Uruguay	1940	only	-	Oct	27	 0:00	0:30	-
 # From Tim Parenti (2018-02-15):
 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified
 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel".
 # http://www.impo.com.uy/diariooficial/1941/08/04/1
 Rule	Uruguay	1941	only	-	Aug	 1	 0:00	0:30	-
 # From Tim Parenti (2018-02-15):
 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified
 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00.  Since clocks
 # never went back to UT-03:30 thereafter, this is modeled as advancing standard
 # time by 30 minutes to UT-03, while retaining 30 minutes of DST.
 # http://www.impo.com.uy/diariooficial/1942/12/16/3
 Rule	Uruguay	1942	only	-	Dec	14	 0:00	0:30	-
 Rule	Uruguay	1943	only	-	Mar	14	 0:00	0	-
 Rule	Uruguay	1959	only	-	May	24	 0:00	0:30	-
 Rule	Uruguay	1959	only	-	Nov	15	 0:00	0	-
 Rule	Uruguay	1960	only	-	Jan	17	 0:00	1:00	-
 Rule	Uruguay	1960	only	-	Mar	 6	 0:00	0	-
 Rule	Uruguay	1965	only	-	Apr	 4	 0:00	1:00	-
 Rule	Uruguay	1965	only	-	Sep	26	 0:00	0	-
 # From Tim Parenti (2018-02-15):
 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the
 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00.
 # http://www.impo.com.uy/diariooficial/1968/05/30/5
 Rule	Uruguay	1968	only	-	May	27	 0:00	0:30	-
 Rule	Uruguay	1968	only	-	Dec	 1	 0:00	0	-
 # From Tim Parenti (2018-02-15):
 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity
 # consumption "as a consequence of the current rainfall regime in the country".
 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00.
 # http://www.impo.com.uy/diariooficial/1970/04/29/4
 Rule	Uruguay	1970	only	-	Apr	25	 0:00	1:00	-
 Rule	Uruguay	1970	only	-	Jun	14	 0:00	0	-
 Rule	Uruguay	1972	only	-	Apr	23	 0:00	1:00	-
 Rule	Uruguay	1972	only	-	Jul	16	 0:00	0	-
 # From Tim Parenti (2018-02-15):
 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of
 # oil", advanced clocks by 90 minutes (to UT-01:30).  Decreto 163/974 of
 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30
 # minutes followed in Decreto 679/974 of 1974-08-29.
 # http://www.impo.com.uy/diariooficial/1974/01/22/11
 # http://www.impo.com.uy/diariooficial/1974/03/14/3
 # http://www.impo.com.uy/diariooficial/1974/09/04/6
 Rule	Uruguay	1974	only	-	Jan	13	 0:00	1:30	-
 Rule	Uruguay	1974	only	-	Mar	10	 0:00	0:30	-
 Rule	Uruguay	1974	only	-	Sep	 1	 0:00	0	-
 Rule	Uruguay	1974	only	-	Dec	22	 0:00	1:00	-
 Rule	Uruguay	1975	only	-	Mar	30	 0:00	0	-
 Rule	Uruguay	1976	only	-	Dec	19	 0:00	1:00	-
 Rule	Uruguay	1977	only	-	Mar	 6	 0:00	0	-
 Rule	Uruguay	1977	only	-	Dec	 4	 0:00	1:00	-
 Rule	Uruguay	1978	1979	-	Mar	Sun>=1	 0:00	0	-
 Rule	Uruguay	1978	only	-	Dec	17	 0:00	1:00	-
 Rule	Uruguay	1979	only	-	Apr	29	 0:00	1:00	-
 Rule	Uruguay	1980	only	-	Mar	16	 0:00	0	-
 # From Tim Parenti (2018-02-15):
 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist
 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00.
 # http://www.impo.com.uy/diariooficial/1988/01/25/1
 Rule	Uruguay	1987	only	-	Dec	14	 0:00	1:00	-
 Rule	Uruguay	1988	only	-	Feb	28	 0:00	0	-
 Rule	Uruguay	1988	only	-	Dec	11	 0:00	1:00	-
 Rule	Uruguay	1989	only	-	Mar	 5	 0:00	0	-
 Rule	Uruguay	1989	only	-	Oct	29	 0:00	1:00	-
 Rule	Uruguay	1990	only	-	Feb	25	 0:00	0	-
 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04):
 # IATA agrees as below for 1990-10 through 1993-02.  Per Almanaque 2018, the
 # 1992/1993 season appears to be the first in over half a century where DST
 # both began and ended pursuant to the same decree.
 Rule	Uruguay	1990	1991	-	Oct	Sun>=21	 0:00	1:00	-
 Rule	Uruguay	1991	1992	-	Mar	Sun>=1	 0:00	0	-
 Rule	Uruguay	1992	only	-	Oct	18	 0:00	1:00	-
 Rule	Uruguay	1993	only	-	Feb	28	 0:00	0	-
 # From Eduardo Cota (2004-09-20):
 # The Uruguayan government has decreed a change in the local time....
 # From Tim Parenti (2018-02-15):
 # Decreto 328/004 of 2004-09-15.
 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1
 Rule	Uruguay	2004	only	-	Sep	19	 0:00	1:00	-
 # From Steffen Thorsen (2005-03-11):
 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to
 # save energy ... it was postponed two weeks....
 # From Tim Parenti (2018-02-15):
 # This 2005 postponement is not in Almanaque 2018.  Go with the contemporaneous
 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending
 # Decreto 328/004:
 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1
 # The original decree specified a transition of 2005-03-12 24:00, but the new
 # one specified 2005-03-27 02:00.
 Rule	Uruguay	2005	only	-	Mar	27	 2:00	0	-
 # From Eduardo Cota (2005-09-27):
 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time,
 # official time in Uruguay will be at GMT -2.
 # From Tim Parenti (2018-02-15):
 # Decreto 318/005 of 2005-09-19.
 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1
 Rule	Uruguay	2005	only	-	Oct	 9	 2:00	1:00	-
 Rule	Uruguay	2006	2015	-	Mar	Sun>=8	 2:00	0	-
 # From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06):
 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday
 # of October at 02:00 through the second Sunday of March at 02:00.  Almanaque
 # 2018 appears to have a few typoed dates through this period; ignore them.
 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1
 Rule	Uruguay	2006	2014	-	Oct	Sun>=1	 2:00	1:00	-
 # From Steffen Thorsen (2015-06-30):
 # ... it looks like they will not be using DST the coming summer:
 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
 # From Paul Eggert (2015-06-30):
 # Apparently restaurateurs complained that DST caused people to go to the beach
 # instead of out to dinner.
 # From Pablo Camargo (2015-07-13):
 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
 # From Tim Parenti (2018-02-15):
 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.
 
 # This Zone can be simplified once we assume zic %z.
 Zone America/Montevideo	-3:44:51 -	LMT	1908 Jun 10
 			-3:44:51 -	MMT	1920 May  1 # Montevideo MT
 			-4:00	-	-04	1923 Oct  1
 			-3:30	Uruguay	-0330/-03 1942 Dec 14
 			-3:00	Uruguay	-03/-0230 1960
 			-3:00	Uruguay	-03/-02	1968
 			-3:00	Uruguay	-03/-0230 1970
 			-3:00	Uruguay	-03/-02	1974
 			-3:00	Uruguay	-03/-0130 1974 Mar 10
 			-3:00	Uruguay	-03/-0230 1974 Dec 22
 			-3:00	Uruguay	-03/-02
 
 # Venezuela
 #
 # From Paul Eggert (2015-07-28):
 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533
 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf
 #
 # From John Stainforth (2007-11-28):
 # ... the change for Venezuela originally expected for 2007-12-31 has
 # been brought forward to 2007-12-09.  The official announcement was
 # published today in the "Gaceta Oficial de la República Bolivariana
 # de Venezuela, número 38.819" (official document for all laws or
 # resolution publication)
 # http://www.globovision.com/news.php?nid=72208
 
 # From Alexander Krivenyshev (2016-04-15):
 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino
 #
 # From Paul Eggert (2016-04-15):
 # Clocks advance 30 minutes on 2016-05-01 at 02:30....
 # "'Venezuela's new time-zone: hours without light, hours without water,
 # hours of presidential broadcasts, hours of lines,' quipped comedian
 # Jean Mary Curró ...". See: Cawthorne A, Kai D. Venezuela scraps
 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400
 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE
 #
 # From Matt Johnson (2016-04-20):
 # ... published in the official Gazette [2016-04-18], here:
 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Caracas	-4:27:44 -	LMT	1890
 			-4:27:40 -	CMT	1912 Feb 12 # Caracas Mean Time?
 			-4:30	-	-0430	1965 Jan  1  0:00
 			-4:00	-	-04	2007 Dec  9  3:00
 			-4:30	-	-0430	2016 May  1  2:30
 			-4:00	-	-04
diff --git a/theory.html b/theory.html
index 298db866b39c..75e347f0f9d1 100644
--- a/theory.html
+++ b/theory.html
@@ -1,1480 +1,1479 @@
 
 
 
   Theory and pragmatics of the tz code and data
   
   
 
 
 
 
Theory and pragmatics of the tz code and data

   
Outline

   
 
 

   
Scope of the tz database

 

 The tz
 database attempts to record the history and predicted future of
 civil time scales.
 It organizes time zone and daylight saving time
 data by partitioning the world into timezones
 whose clocks all agree about timestamps that occur after the POSIX Epoch
 (1970-01-01 00:00:00 UTC).
 Although 1970 is a somewhat-arbitrary cutoff, there are significant
 challenges to moving the cutoff earlier even by a decade or two, due
 to the wide variety of local practices before computer timekeeping
 became prevalent.
 Most timezones correspond to a notable location and the database
 records all known clock transitions for that location;
 some timezones correspond instead to a fixed UTC offset.
 

 
 

 Each timezone typically corresponds to a geographical region that is
 smaller than a traditional time zone, because clocks in a timezone
 all agree after 1970 whereas a traditional time zone merely
 specifies current standard time. For example, applications that deal
 with current and future timestamps in the traditional North
 American mountain time zone can choose from the timezones
 America/Denver which observes US-style daylight saving
 time (DST),
-America/Mazatlan which observes Mexican-style DST,
 and America/Phoenix which does not observe DST.
 Applications that also deal with past timestamps in the mountain time
 zone can choose from over a dozen timezones, such as
 America/Boise, America/Edmonton, and
 America/Hermosillo, each of which currently uses mountain
 time but differs from other timezones for some timestamps after 1970.
 

 
 

 Clock transitions before 1970 are recorded for location-based timezones,
 because most systems support timestamps before 1970 and could
 misbehave if data entries were omitted for pre-1970 transitions.
 However, the database is not designed for and does not suffice for
 applications requiring accurate handling of all past times everywhere,
 as it would take far too much effort and guesswork to record all
 details of pre-1970 civil timekeeping.
 Although some information outside the scope of the database is
 collected in a file backzone that is distributed along
 with the database proper, this file is less reliable and does not
 necessarily follow database guidelines.
 

 
 

 As described below, reference source code for using the
 tz database is also available.
 The tz code is upwards compatible with POSIX, an international
 standard for UNIX-like systems.
 As of this writing, the current edition of POSIX is:  The Open
 Group Base Specifications Issue 7, IEEE Std 1003.1-2017, 2018
 Edition.
 Because the database's scope encompasses real-world changes to civil
 timekeeping, its model for describing time is more complex than the
 standard and daylight saving times supported by POSIX.
 A tz timezone corresponds to a ruleset that can
 have more than two changes per year, these changes need not merely
 flip back and forth between two alternatives, and the rules themselves
 can change at times.
 Whether and when a timezone changes its clock,
 and even the timezone's notional base offset from UTC,
 are variable.
 It does not always make sense to talk about a timezone's
 "base offset", which is not necessarily a single number.
 

 
 

 
 

   
Timezone identifiers

 

 Each timezone has a name that uniquely identifies the timezone.
 Inexperienced users are not expected to select these names unaided.
 Distributors should provide documentation and/or a simple selection
 interface that explains each name via a map or via descriptive text like
 "Czech Republic" instead of the timezone name "Europe/Prague".
 If geolocation information is available, a selection interface can
 locate the user on a timezone map or prioritize names that are
 geographically close. For an example selection interface, see the
 tzselect program in the tz code.
 The Unicode Common Locale Data
 Repository contains data that may be useful for other selection
 interfaces; it maps timezone names like Europe/Prague to
 locale-dependent strings like "Prague", "Praha", "Прага", and "布拉格".
 

 
 

 The naming conventions attempt to strike a balance
 among the following goals:
 

 
 
    
   
  • 
     Uniquely identify every timezone where clocks have agreed since 1970.
     This is essential for the intended use: static clocks keeping local
     civil time.
   
    • 
   
  • 
     Indicate to experts where the timezone's clocks typically are.
   
    • 
   
  • 
     Be robust in the presence of political changes.
     For example, names are typically not tied to countries, to avoid
     incompatibilities when countries change their name (e.g.,
     Swaziland→Eswatini) or when locations change countries (e.g., Hong
     Kong from UK colony to China).
     There is no requirement that every country or national
     capital must have a timezone name.
   
    • 
   
  • 
     Be portable to a wide variety of implementations.
   
    • 
   
  • 
     Use a consistent naming conventions over the entire world.
   
    • 
 

 
 

 Names normally have the form
 AREA/LOCATION, where
 AREA is a continent or ocean, and
 LOCATION is a specific location within the area.
 North and South America share the same area, 'America'.
 Typical names are 'Africa/Cairo',
 'America/New_York', and 'Pacific/Honolulu'.
 Some names are further qualified to help avoid confusion; for example,
 'America/Indiana/Petersburg' distinguishes Petersburg,
 Indiana from other Petersburgs in America.
 

 
 

 Here are the general guidelines used for
 choosing timezone names,
 in decreasing order of importance:
 

 
 
    
   
  • 
     Use only valid POSIX file name components (i.e., the parts of
     names other than '/').
     Do not use the file name components '.' and
     '..'.
     Within a file name component, use only ASCII letters,
     '.', '-' and '_'.
     Do not use digits, as that might create an ambiguity with POSIX
     TZ strings.
     A file name component must not exceed 14 characters or start with
     '-'.
     E.g., prefer America/Noronha to
     America/Fernando_de_Noronha.
     Exceptions: see the discussion of legacy names below.
   
    • 
   
  • 
     A name must not be empty, or contain '//', or
     start or end with '/'.
   
    • 
   
  • 
     Do not use names that differ only in case.
     Although the reference implementation is case-sensitive, some
     other implementations are not, and they would mishandle names
     differing only in case.
   
    • 
   
  • 
     If one name A is an initial prefix of another
     name AB (ignoring case), then B must not
     start with '/', as a regular file cannot have the
     same name as a directory in POSIX.
     For example, America/New_York precludes
     America/New_York/Bronx.
   
    • 
   
  • 
     Uninhabited regions like the North Pole and Bouvet Island
     do not need locations, since local time is not defined there.
   
    • 
   
  • 
     If all the clocks in a timezone have agreed since 1970,
     do not bother to include more than one timezone
     even if some of the clocks disagreed before 1970.
     Otherwise these tables would become annoyingly large.
   
    • 
   
  • 
     If boundaries between regions are fluid, such as during a war or
     insurrection, do not bother to create a new timezone merely
     because of yet another boundary change. This helps prevent table
     bloat and simplifies maintenance.
   
    • 
   
  • 
     If a name is ambiguous, use a less ambiguous alternative;
     e.g., many cities are named San José and Georgetown, so
     prefer America/Costa_Rica to
     America/San_Jose and America/Guyana
     to America/Georgetown.
   
    • 
   
  • 
     Keep locations compact.
     Use cities or small islands, not countries or regions, so that any
     future changes do not split individual locations into different
     timezones.
     E.g., prefer Europe/Paris to Europe/France,
     since
     France
     has had multiple time zones.
   
    • 
   
  • 
     Use mainstream English spelling, e.g., prefer
     Europe/Rome to Europa/Roma, and
     prefer Europe/Athens to the Greek
     Ευρώπη/Αθήνα or the Romanized
     Evrópi/Athína.
     The POSIX file name restrictions encourage this guideline.
   
    • 
   
  • 
     Use the most populous among locations in a region,
     e.g., prefer Asia/Shanghai to
     Asia/Beijing.
     Among locations with similar populations, pick the best-known
     location, e.g., prefer Europe/Rome to
     Europe/Milan.
   
    • 
   
  • 
     Use the singular form, e.g., prefer Atlantic/Canary to
     Atlantic/Canaries.
   
    • 
   
  • 
     Omit common suffixes like '_Islands' and
     '_City', unless that would lead to ambiguity.
     E.g., prefer America/Cayman to
     America/Cayman_Islands and
     America/Guatemala to
     America/Guatemala_City, but prefer
     America/Mexico_City to
     America/Mexico
     because the
     country of Mexico has several time zones.
   
    • 
   
  • 
     Use '_' to represent a space.
   
    • 
   
  • 
     Omit '.' from abbreviations in names.
     E.g., prefer Atlantic/St_Helena to
     Atlantic/St._Helena.
   
    • 
   
  • 
     Do not change established names if they only marginally violate
     the above guidelines.
     For example, do not change the existing name Europe/Rome to
     Europe/Milan merely because Milan's population has grown
     to be somewhat greater than Rome's.
   
    • 
   
  • 
     If a name is changed, put its old spelling in the
     'backward' file as a link to the new spelling.
     This means old spellings will continue to work.
     Ordinarily a name change should occur only in the rare case when
     a location's consensus English-language spelling changes; for example,
     in 2008 Asia/Calcutta was renamed to Asia/Kolkata
     due to long-time widespread use of the new city name instead of the old.
   
    • 
 

 
 

 Guidelines have evolved with time, and names following old versions of
 these guidelines might not follow the current version. When guidelines
 have changed, old names continue to be supported. Guideline changes
 have included the following:
 

 
 
    
 
  • 
 Older versions of this package used a different naming scheme.
 See the file 'backward' for most of these older names
 (e.g., 'US/Eastern' instead of 'America/New_York').
 The other old-fashioned names still supported are
 'WET', 'CET', 'MET', and
 'EET' (see the file 'europe').
 
    • 
 
 
  • 
 Older versions of this package defined legacy names that are
 incompatible with the first guideline of location names, but which are
 still supported.
 These legacy names are mostly defined in the file
 'etcetera'.
 Also, the file 'backward' defines the legacy names
 'Etc/GMT0', 'Etc/GMT-0', 'Etc/GMT+0',
 'GMT0', 'GMT-0' and 'GMT+0',
 and the file 'northamerica' defines the legacy names
 'EST5EDT', 'CST6CDT',
 'MST7MDT', and 'PST8PDT'.
 
    • 
 
 
  • 
 Older versions of these guidelines said that
 there should typically be at least one name for each ISO
 3166-1 officially assigned two-letter code for an inhabited
 country or territory.
 This old guideline has been dropped, as it was not needed to handle
 timestamps correctly and it increased maintenance burden.
 
    • 
 

 
 

 The file zone1970.tab lists geographical locations used
 to name timezones.
 It is intended to be an exhaustive list of names for geographic
 regions as described above; this is a subset of the timezones in the data.
 Although a zone1970.tab location's
 longitude
 corresponds to
 its local mean
 time (LMT) offset with one hour for every 15°
 east longitude, this relationship is not exact.
 The backward-compatibility file zone.tab is similar
 but conforms to the older-version guidelines related to ISO 3166-1;
 it lists only one country code per entry and unlike zone1970.tab
 it can list names defined in backward.
 

 
 

 The database defines each timezone name to be a zone, or a link to a zone.
 The source file backward defines links for backward
 compatibility; it does not define zones.
 Although backward was originally designed to be optional,
 nowadays distributions typically use it
 and no great weight should be attached to whether a link
 is defined in backward or in some other file.
 The source file etcetera defines names that may be useful
 on platforms that do not support POSIX-style TZ strings;
 no other source file other than backward
 contains links to its zones.
 One of etcetera's names is Etc/UTC,
 used by functions like gmtime to obtain leap
 second information on platforms that support leap seconds.
 Another etcetera name, GMT,
 is used by older code releases.
 

 

 
 

   
Time zone abbreviations

 

 When this package is installed, it generates time zone abbreviations
 like 'EST' to be compatible with human tradition and POSIX.
 Here are the general guidelines used for choosing time zone abbreviations,
 in decreasing order of importance:
 

 
 
    
   
  • 
     Use three to six characters that are ASCII alphanumerics or
     '+' or '-'.
     Previous editions of this database also used characters like
     space and '?', but these characters have a
     special meaning to the
     UNIX shell
     and cause commands like
     'set
     `date`'
     to have unexpected effects.
     Previous editions of this guideline required upper-case letters, but the
     Congressman who introduced
     Chamorro
     Standard Time preferred "ChST", so lower-case letters are now
     allowed.
     Also, POSIX from 2001 on relaxed the rule to allow '-',
     '+', and alphanumeric characters from the portable
     character set in the current locale.
     In practice ASCII alphanumerics and '+' and
     '-' are safe in all locales.
 
     
    
     In other words, in the C locale the POSIX extended regular
     expression [-+[:alnum:]]{3,6} should match the
     abbreviation.
     This guarantees that all abbreviations could have been specified by a
     POSIX TZ string.
     
    
   
    • 
   
  • 
     Use abbreviations that are in common use among English-speakers,
     e.g., 'EST' for Eastern Standard Time in North America.
     We assume that applications translate them to other languages
     as part of the normal localization process; for example,
     a French application might translate 'EST' to 'HNE'.
 
     
    
     These abbreviations (for standard/daylight/etc. time) are:
       ACST/ACDT Australian Central,
       AST/ADT/APT/AWT/ADDT Atlantic,
       AEST/AEDT Australian Eastern,
       AHST/AHDT Alaska-Hawaii,
       AKST/AKDT Alaska,
       AWST/AWDT Australian Western,
       BST/BDT Bering,
       CAT/CAST Central Africa,
       CET/CEST/CEMT Central European,
       ChST Chamorro,
       CST/CDT/CWT/CPT/CDDT Central [North America],
       CST/CDT China,
       GMT/BST/IST/BDST Greenwich,
       EAT East Africa,
       EST/EDT/EWT/EPT/EDDT Eastern [North America],
       EET/EEST Eastern European,
       GST/GDT Guam,
       HST/HDT/HWT/HPT Hawaii,
       HKT/HKST/HKWT Hong Kong,
       IST India,
       IST/GMT Irish,
       IST/IDT/IDDT Israel,
       JST/JDT Japan,
       KST/KDT Korea,
       MET/MEST Middle European (a backward-compatibility alias for
 	Central European),
       MSK/MSD Moscow,
       MST/MDT/MWT/MPT/MDDT Mountain,
       NST/NDT/NWT/NPT/NDDT Newfoundland,
       NST/NDT/NWT/NPT Nome,
       NZMT/NZST New Zealand through 1945,
       NZST/NZDT New Zealand 1946–present,
       PKT/PKST Pakistan,
       PST/PDT/PWT/PPT/PDDT Pacific,
       PST/PDT Philippine,
       SAST South Africa,
       SST Samoa,
       UTC Universal,
       WAT/WAST West Africa,
       WET/WEST/WEMT Western European,
       WIB Waktu Indonesia Barat,
       WIT Waktu Indonesia Timur,
       WITA Waktu Indonesia Tengah,
       YST/YDT/YWT/YPT/YDDT Yukon.
     
    
   
    • 
   
  • 
     
    
     For times taken from a city's longitude, use the
     traditional xMT notation.
     The only abbreviation like this in current use is 'GMT'.
     The others are for timestamps before 1960,
     except that Monrovia Mean Time persisted until 1972.
     Typically, numeric abbreviations (e.g., '-004430' for
     MMT) would cause trouble here, as the numeric strings would exceed
     the POSIX length limit.
     
    
 
     
    
     These abbreviations are:
       AMT Asunción, Athens;
       BMT Baghdad, Bangkok, Batavia, Bermuda, Bern, Bogotá, Bridgetown,
         Brussels, Bucharest;
       CMT Calamarca, Caracas, Chisinau, Colón, Córdoba;
       DMT Dublin/Dunsink;
       EMT Easter;
       FFMT Fort-de-France;
       FMT Funchal;
       GMT Greenwich;
       HMT Havana, Helsinki, Horta, Howrah;
       IMT Irkutsk, Istanbul;
       JMT Jerusalem;
       KMT Kaunas, Kyiv, Kingston;
       LMT Lima, Lisbon, local, Luanda;
       MMT Macassar, Madras, Malé, Managua, Minsk, Monrovia, Montevideo,
 	Moratuwa, Moscow;
       PLMT Phù Liễn;
       PMT Paramaribo, Paris, Perm, Pontianak, Prague;
       PMMT Port Moresby;
       QMT Quito;
       RMT Rangoon, Riga, Rome;
       SDMT Santo Domingo;
       SJMT San José;
       SMT Santiago, Simferopol, Singapore, Stanley;
       TBMT Tbilisi;
       TMT Tallinn, Tehran;
       WMT Warsaw;
       ZMT Zomba.
     
    
 
     
    
     A few abbreviations also follow the pattern that
     GMT/BST established for time in the UK.
     They are:
       BMT/BST for Bermuda 1890–1930,
       CMT/BST for Calamarca Mean Time and Bolivian Summer Time
 	1890–1932,
       DMT/IST for Dublin/Dunsink Mean Time and Irish Summer Time
 	1880–1916,
       MMT/MST/MDST for Moscow 1880–1919, and
       RMT/LST for Riga Mean Time and Latvian Summer time 1880–1926.
     
     
    
   
    • 
   
  • 
     Use 'LMT' for local mean time of locations before the
     introduction of standard time; see "Scope of the
     tz database".
   
    • 
   
  • 
     If there is no common English abbreviation, use numeric offsets like
     -05 and +0530 that are generated
     by zic's %z notation.
   
    • 
   
  • 
     Use current abbreviations for older timestamps to avoid confusion.
     For example, in 1910 a common English abbreviation for time
     in central Europe was 'MEZ' (short for both "Middle European
     Zone" and for "Mitteleuropäische Zeit" in German).
     Nowadays 'CET' ("Central European Time") is more common in
     English, and the database uses 'CET' even for circa-1910
     timestamps as this is less confusing for modern users and avoids
     the need for determining when 'CET' supplanted 'MEZ' in common
     usage.
   
    • 
   
  • 
     Use a consistent style in a timezone's history.
     For example, if a history tends to use numeric
     abbreviations and a particular entry could go either way, use a
     numeric abbreviation.
   
    • 
   
  • 
     Use
     Universal Time
     (UT) (with time zone abbreviation '-00') for
     locations while uninhabited.
     The leading '-' is a flag that the UT offset is in
     some sense undefined; this notation is derived
     from Internet
     RFC 3339.
   
    • 
 

 
 

 Application writers should note that these abbreviations are ambiguous
 in practice: e.g., 'CST' means one thing in China and something else
 in North America, and 'IST' can refer to time in India, Ireland or
 Israel.
 To avoid ambiguity, use numeric UT offsets like
 '-0600' instead of time zone abbreviations like 'CST'.
 

 

 
 

   
Accuracy of the tz database

 

 The tz database is not authoritative, and it
 surely has errors.
 Corrections are welcome and encouraged; see the file CONTRIBUTING.
 Users requiring authoritative data should consult national standards
 bodies and the references cited in the database's comments.
 

 
 

 Errors in the tz database arise from many sources:
 

 
 
    
   
  • 
     The tz database predicts future
     timestamps, and current predictions
     will be incorrect after future governments change the rules.
     For example, if today someone schedules a meeting for 13:00 next
     October 1, Casablanca time, and tomorrow Morocco changes its
     daylight saving rules, software can mess up after the rule change
     if it blithely relies on conversions made before the change.
   
    • 
   
  • 
     The pre-1970 entries in this database cover only a tiny sliver of how
     clocks actually behaved; the vast majority of the necessary
     information was lost or never recorded.
     Thousands more timezones would be needed if
     the tz database's scope were extended to
     cover even just the known or guessed history of standard time; for
     example, the current single entry for France would need to split
     into dozens of entries, perhaps hundreds.
     And in most of the world even this approach would be misleading
     due to widespread disagreement or indifference about what times
     should be observed.
     In her 2015 book
     The
     Global Transformation of Time, 1870–1950,
     Vanessa Ogle writes
     "Outside of Europe and North America there was no system of time
     zones at all, often not even a stable landscape of mean times,
     prior to the middle decades of the twentieth century".
     See: Timothy Shenk, Booked:
       A Global History of Time. Dissent 2015-12-17.
   
    • 
   
  • 
     Most of the pre-1970 data entries come from unreliable sources, often
     astrology books that lack citations and whose compilers evidently
     invented entries when the true facts were unknown, without
     reporting which entries were known and which were invented.
     These books often contradict each other or give implausible entries,
     and on the rare occasions when they are checked they are
     typically found to be incorrect.
   
    • 
   
  • 
     For the UK the tz database relies on
     years of first-class work done by
     Joseph Myers and others; see
     "History of
     legal time in Britain".
     Other countries are not done nearly as well.
   
    • 
   
  • 
     Sometimes, different people in the same city maintain clocks
     that differ significantly.
     Historically, railway time was used by railroad companies (which
     did not always
     agree with each other), church-clock time was used for birth
     certificates, etc.
     More recently, competing political groups might disagree about
     clock settings. Often this is merely common practice, but
     sometimes it is set by law.
     For example, from 1891 to 1911 the UT offset in France
     was legally UT +00:09:21 outside train stations and
     UT +00:04:21 inside. Other examples include
     Chillicothe in 1920, Palm Springs in 1946/7, and Jerusalem and
     Ürümqi to this day.
   
    • 
   
  • 
     Although a named location in the tz
     database stands for the containing region, its pre-1970 data
     entries are often accurate for only a small subset of that region.
     For example, Europe/London stands for the United
     Kingdom, but its pre-1847 times are valid only for locations that
     have London's exact meridian, and its 1847 transition
     to GMT is known to be valid only for the L&NW and
     the Caledonian railways.
   
    • 
   
  • 
     The tz database does not record the
     earliest time for which a timezone's
     data entries are thereafter valid for every location in the region.
     For example, Europe/London is valid for all locations
     in its region after GMT was made the standard time,
     but the date of standardization (1880-08-02) is not in the
     tz database, other than in commentary.
     For many timezones the earliest time of
     validity is unknown.
   
    • 
   
  • 
     The tz database does not record a
     region's boundaries, and in many cases the boundaries are not known.
     For example, the timezone
     America/Kentucky/Louisville represents a region
     around the city of Louisville, the boundaries of which are
     unclear.
   
    • 
   
  • 
     Changes that are modeled as instantaneous transitions in the
     tz
     database were often spread out over hours, days, or even decades.
   
    • 
   
  • 
     Even if the time is specified by law, locations sometimes
     deliberately flout the law.
   
    • 
   
  • 
     Early timekeeping practices, even assuming perfect clocks, were
     often not specified to the accuracy that the
     tz database requires.
   
    • 
   
  • 
     The tz database cannot represent stopped clocks.
     However, on 1911-03-11 at 00:00, some public-facing French clocks
     were changed by stopping them for a few minutes to effect a transition.
     The tz database models this via a
     backward transition; the relevant French legislation does not
     specify exactly how the transition was to occur.
   
    • 
   
  • 
     Sometimes historical timekeeping was specified more precisely
     than what the tz code can handle.
     For example, from 1880 to 1916 clocks in Ireland observed Dublin Mean
     Time (estimated to be UT
     −00:25:21.1); although the tz
     source data can represent the .1 second, TZif files and the code cannot.
     In practice these old specifications were rarely if ever
     implemented to subsecond precision.
   
    • 
   
  • 
     Even when all the timestamp transitions recorded by the
     tz database are correct, the
     tz rules that generate them may not
     faithfully reflect the historical rules.
     For example, from 1922 until World War II the UK moved clocks
     forward the day following the third Saturday in April unless that
     was Easter, in which case it moved clocks forward the previous
     Sunday.
     Because the tz database has no
     way to specify Easter, these exceptional years are entered as
     separate tz Rule lines, even though the
     legal rules did not change.
     When transitions are known but the historical rules behind them are not,
     the database contains Zone and Rule
     entries that are intended to represent only the generated
     transitions, not any underlying historical rules; however, this
     intent is recorded at best only in commentary.
   
    • 
   
  • 
     The tz database models time
     using the proleptic
     Gregorian calendar with days containing 24 equal-length hours
     numbered 00 through 23, except when clock transitions occur.
     Pre-standard time is modeled as local mean time.
     However, historically many people used other calendars and other timescales.
     For example, the Roman Empire used
     the Julian
     calendar,
     and Roman
     timekeeping had twelve varying-length daytime hours with a
     non-hour-based system at night.
     And even today, some local practices diverge from the Gregorian
     calendar with 24-hour days. These divergences range from
     relatively minor, such as Japanese bars giving times like "24:30" for the
     wee hours of the morning, to more-significant differences such as the
     east African practice of starting the day at dawn, renumbering
     the Western 06:00 to be 12:00. These practices are largely outside
     the scope of the tz code and data, which
     provide only limited support for date and time localization
     such as that required by POSIX.
     If DST is not used a different time zone
     can often do the trick; for example, in Kenya a TZ setting
     like <-03>3 or America/Cayenne starts
     the day six hours later than Africa/Nairobi does.
   
    • 
   
  • 
     Early clocks were less reliable, and data entries do not represent
     clock error.
   
    • 
   
  • 
     The tz database assumes Universal Time
     (UT) as an origin, even though UT is not
     standardized for older timestamps.
     In the tz database commentary,
     UT denotes a family of time standards that includes
     Coordinated Universal Time (UTC) along with other
     variants such as UT1 and GMT,
     with days starting at midnight.
     Although UT equals UTC for modern
     timestamps, UTC was not defined until 1960, so
     commentary uses the more-general abbreviation UT for
     timestamps that might predate 1960.
     Since UT, UT1, etc. disagree slightly,
     and since pre-1972 UTC seconds varied in length,
     interpretation of older timestamps can be problematic when
     subsecond accuracy is needed.
   
    • 
   
  • 
     Civil time was not based on atomic time before 1972, and we do not
     know the history of
     earth's
     rotation accurately enough to map SI seconds to
     historical solar time
     to more than about one-hour accuracy.
     See: Stephenson FR, Morrison LV, Hohenkerk CY.
     Measurement of
     the Earth's rotation: 720 BC to AD 2015.
     Proc Royal Soc A. 2016;472:20160404.
     Also see: Espenak F. Uncertainty
     in Delta T (ΔT).
   
    • 
   
  • 
     The relationship between POSIX time (that is, UTC but
     ignoring leap
     seconds) and UTC is not agreed upon after 1972.
     Although the POSIX
     clock officially stops during an inserted leap second, at least one
     proposed standard has it jumping back a second instead; and in
     practice POSIX clocks more typically either progress glacially during
     a leap second, or are slightly slowed while near a leap second.
   
    • 
   
  • 
     The tz database does not represent how
     uncertain its information is.
     Ideally it would contain information about when data entries are
     incomplete or dicey.
     Partial temporal knowledge is a field of active research, though,
     and it is not clear how to apply it here.
   
    • 
 

 
 

 In short, many, perhaps most, of the tz
 database's pre-1970 and future timestamps are either wrong or
 misleading.
 Any attempt to pass the
 tz database off as the definition of time
 should be unacceptable to anybody who cares about the facts.
 In particular, the tz database's
 LMT offsets should not be considered meaningful, and
 should not prompt creation of timezones
 merely because two locations
 differ in LMT or transitioned to standard time at
 different dates.
 

 

 
 

   
Time and date functions

 

 The tz code contains time and date functions
 that are upwards compatible with those of POSIX.
 Code compatible with this package is already
 part of many platforms, where the
 primary use of this package is to update obsolete time-related files.
 To do this, you may need to compile the time zone compiler
 'zic' supplied with this package instead of using the
 system 'zic', since the format of zic's
 input is occasionally extended, and a platform may still be shipping
 an older zic.
 

 
 
POSIX properties and limitations

 
    
   
  • 
     
    
     In POSIX, time display in a process is controlled by the
     environment variable TZ.
     Unfortunately, the POSIX
     TZ string takes a form that is hard to describe and
     is error-prone in practice.
     Also, POSIX TZ strings cannot deal with daylight
     saving time rules not based on the Gregorian calendar (as in
     Iran), or with situations where more than two time zone
     abbreviations or UT offsets are used in an area.
     
    
 
     
    
     The POSIX TZ string takes the following form:
     
    
 
     
    
     stdoffset[dst[offset][,date[/time],date[/time]]]
     
    
 
     
    
     where:
     
    
 
     
    
       
    std and dst
    
 	are 3 or more characters specifying the standard
 	and daylight saving time (DST) zone abbreviations.
 	Starting with POSIX.1-2001, std and dst
 	may also be in a quoted form like '<+09>';
 	this allows "+" and "-" in the names.
       
    
       
    offset
    
 	is of the form
 	'[±]hh:[mm[:ss]]'
 	and specifies the offset west of UT.
 	'hh' may be a single digit;
 	0≤hh≤24.
 	The default DST offset is one hour ahead of
 	standard time.
       
    
       
    date[/time],date[/time]
    
 	specifies the beginning and end of DST.
 	If this is absent, the system supplies its own ruleset
 	for DST, and its rules can differ from year to year;
 	typically US DST rules are used.
       
    
       
    time
    
 	takes the form
 	'hh:[mm[:ss]]'
 	and defaults to 02:00.
 	This is the same format as the offset, except that a
 	leading '+' or '-' is not allowed.
       
    
       
    date
    
 	takes one of the following forms:
 	
    
 	  
    Jn (1≤n≤365)
    
 	    origin-1 day number not counting February 29
 	  
    
 	  
    n (0≤n≤365)
    
 	    origin-0 day number counting February 29 if present
 	  
    
 	  
    Mm.n.d
 	    (0[Sunday]≤d≤6[Saturday], 1≤n≤5,
 	    1≤m≤12)
    
 	    for the dth day of week n of
 	    month m of the year, where week 1 is the first
 	    week in which day d appears, and
 	    '5' stands for the last week in which
 	    day d appears (which may be either the 4th or
 	    5th week).
 	    Typically, this is the only useful form; the n
 	    and Jn forms are rarely used.
 	  
    
 	
    
       
    
     
    
 
     
    
     Here is an example POSIX TZ string for New
     Zealand after 2007.
     It says that standard time (NZST) is 12 hours ahead
     of UT, and that daylight saving time
     (NZDT) is observed from September's last Sunday at
     02:00 until April's first Sunday at 03:00:
     
    
 
     
    TZ='NZST-12NZDT,M9.5.0,M4.1.0/3'
    
 
     
    
     This POSIX TZ string is hard to remember, and
     mishandles some timestamps before 2008.
     With this package you can use this instead:
     
    
 
     
    TZ='Pacific/Auckland'
    
   
    • 
   
  • 
     POSIX does not define the DST transitions
     for TZ values like
     "EST5EDT".
     Traditionally the current US DST rules
     were used to interpret such values, but this meant that the
     US DST rules were compiled into each
     program that did time conversion. This meant that when
     US time conversion rules changed (as in the United
     States in 1987), all programs that did time conversion had to be
     recompiled to ensure proper results.
   
    • 
   
  • 
     The TZ environment variable is process-global, which
     makes it hard to write efficient, thread-safe applications that
     need access to multiple timezones.
   
    • 
   
  • 
     In POSIX, there is no tamper-proof way for a process to learn the
     system's best idea of local (wall clock) time.
     This is important for applications that an administrator wants
     used only at certain times – without regard to whether the
     user has fiddled the
     TZ environment variable.
     While an administrator can "do everything in UT" to
     get around the problem, doing so is inconvenient and precludes
     handling daylight saving time shifts – as might be required to
     limit phone calls to off-peak hours.
   
    • 
   
  • 
     POSIX provides no convenient and efficient way to determine
     the UT offset and time zone abbreviation of arbitrary
     timestamps, particularly for timezones
     that do not fit into the POSIX model.
   
    • 
   
  • 
     POSIX requires that time_t clock counts exclude leap
     seconds.
   
    • 
   
  • 
     The tz code attempts to support all the
     time_t implementations allowed by POSIX.
     The time_t type represents a nonnegative count of seconds
     since 1970-01-01 00:00:00 UTC, ignoring leap seconds.
     In practice, time_t is usually a signed 64- or 32-bit
     integer; 32-bit signed time_t values stop working after
     2038-01-19 03:14:07 UTC, so new implementations these
     days typically use a signed 64-bit integer.
     Unsigned 32-bit integers are used on one or two platforms, and 36-bit
     and 40-bit integers are also used occasionally.
     Although earlier POSIX versions allowed time_t to be a
     floating-point type, this was not supported by any practical system,
     and POSIX.1-2013 and the tz code both
     require time_t to be an integer type.
   
    • 
 

 
 
Extensions to POSIX in the
 tz code

 
    
   
  • 
     
    
     The TZ environment variable is used in generating
     the name of a file from which time-related information is read
     (or is interpreted à la POSIX); TZ is no longer
     constrained to be a string containing abbreviations
     and numeric data as described above.
     The file's format is TZif,
     a timezone information format that contains binary data; see
     Internet
     RFC 8536.
     The daylight saving time rules to be used for a
     particular timezone are encoded in the
     TZif file; the format of the file allows US,
     Australian, and other rules to be encoded, and
     allows for situations where more than two time zone
     abbreviations are used.
     
    
     
    
     It was recognized that allowing the TZ environment
     variable to take on values such as 'America/New_York'
     might cause "old" programs (that expect TZ to have a
     certain form) to operate incorrectly; consideration was given to using
     some other environment variable (for example, TIMEZONE)
     to hold the string used to generate the TZif file's name.
     In the end, however, it was decided to continue using
     TZ: it is widely used for time zone purposes;
     separately maintaining both TZ
     and TIMEZONE seemed a nuisance; and systems where
     "new" forms of TZ might cause problems can simply
     use legacy TZ values such as "EST5EDT" which
     can be used by "new" programs as well as by "old" programs that
     assume pre-POSIX TZ values.
     
    
   
    • 
   
  • 
     The code supports platforms with a UT offset member
     in struct tm, e.g., tm_gmtoff,
     or with a time zone abbreviation member in
     struct tm, e.g., tm_zone. As noted
     in Austin
     Group defect 1533, a future version of POSIX is planned to
     require tm_gmtoff and tm_zone.
   
    • 
   
  • 
     Functions tzalloc, tzfree,
     localtime_rz, and mktime_z for
     more-efficient thread-safe applications that need to use multiple
     timezones.
     The tzalloc and tzfree functions
     allocate and free objects of type timezone_t,
     and localtime_rz and mktime_z are
     like localtime_r and mktime with an
     extra timezone_t argument.
     The functions were inspired by NetBSD.
   
    • 
   
  • 
     Negative time_t values are supported, on systems
     where time_t is signed.
   
    • 
   
  • 
     These functions can account for leap seconds;
     see Leap seconds below.
   
    • 
 

 
 
POSIX features no longer needed

 

 POSIX and ISO C
 define some APIs that are vestigial:
 they are not needed, and are relics of a too-simple model that does
 not suffice to handle many real-world timestamps.
 Although the tz code supports these
 vestigial APIs for backwards compatibility, they should
 be avoided in portable applications.
 The vestigial APIs are:
 

 
    
   
  • 
     The POSIX tzname variable does not suffice and is no
     longer needed.
     To get a timestamp's time zone abbreviation, consult
     the tm_zone member if available; otherwise,
     use strftime's "%Z" conversion
     specification.
   
    • 
   
  • 
     The POSIX daylight and timezone
     variables do not suffice and are no longer needed.
     To get a timestamp's UT offset, consult
     the tm_gmtoff member if available; otherwise,
     subtract values returned by localtime
     and gmtime using the rules of the Gregorian calendar,
     or use strftime's "%z" conversion
     specification if a string like "+0900" suffices.
   
    • 
   
  • 
     The tm_isdst member is almost never needed and most of
     its uses should be discouraged in favor of the abovementioned
     APIs.
     Although it can still be used in arguments to
     mktime to disambiguate timestamps near
     a DST transition when the clock jumps back on
     platforms lacking tm_gmtoff, this
     disambiguation does not work when standard time itself jumps back,
     which can occur when a location changes to a time zone with a
     lesser UT offset.
   
    • 
 

 
 
Other portability notes

 
    
   
  • 
     The 7th Edition
     UNIX timezone function is not present in this
     package; it is impossible to reliably map timezone's
     arguments (a "minutes west of GMT" value and a
     "daylight saving time in effect" flag) to a time zone
     abbreviation, and we refuse to guess.
     Programs that in the past used the timezone function
     may now examine localtime(&clock)->tm_zone
     (if TM_ZONE is defined) or
     tzname[localtime(&clock)->tm_isdst]
     (if HAVE_TZNAME is nonzero) to learn the correct time
     zone abbreviation to use.
   
    • 
   
  • 
     The 4.2BSD
     gettimeofday function is not
     used in this package.
     This formerly let users obtain the current UTC offset
     and DST flag, but this functionality was removed in
     later versions of BSD.
   
    • 
   
  • 
     In SVR2, time conversion fails for near-minimum or
     near-maximum time_t values when doing conversions
     for places that do not use UT.
     This package takes care to do these conversions correctly.
     A comment in the source code tells how to get compatibly wrong
     results.
   
    • 
   
  • 
     The functions that are conditionally compiled
     if STD_INSPIRED is defined should, at this point, be
     looked on primarily as food for thought.
     They are not in any sense "standard compatible" – some are
     not, in fact, specified in any standard.
     They do, however, represent responses of various authors to
     standardization proposals.
   
    • 
   
  • 
     Other time conversion proposals, in particular those supported by the
     Time Zone
     Database Parser, offer a wider selection of functions
     that provide capabilities beyond those provided here.
     The absence of such functions from this package is not meant to
     discourage the development, standardization, or use of such
     functions.
     Rather, their absence reflects the decision to make this package
     contain valid extensions to POSIX, to ensure its broad
     acceptability.
     If more powerful time conversion functions can be standardized, so
     much the better.
   
    • 
 

 

 
 

   
Interface stability

 

 The tz code and data supply the following interfaces:
 

 
 
    
   
  • 
     A set of timezone names as per
       "Timezone identifiers" above.
   
    • 
   
  • 
     Library functions described in "Time and date
       functions" above.
   
    • 
   
  • 
     The programs tzselect, zdump,
     and zic, documented in their man pages.
   
    • 
   
  • 
     The format of zic input files, documented in
     the zic man page.
   
    • 
   
  • 
     The format of zic output files, documented in
     the tzfile man page.
   
    • 
   
  • 
     The format of zone table files, documented in zone1970.tab.
   
    • 
   
  • 
     The format of the country code file, documented in iso3166.tab.
   
    • 
   
  • 
     The version number of the code and data, as the first line of
     the text file 'version' in each release.
   
    • 
 

 
 

 Interface changes in a release attempt to preserve compatibility with
 recent releases.
 For example, tz data files typically do not
 rely on recently-added zic features, so that users can
 run older zic versions to process newer data files.
 Downloading
 the tz database describes how releases
 are tagged and distributed.
 

 
 

 Interfaces not listed above are less stable.
 For example, users should not rely on particular UT
 offsets or abbreviations for timestamps, as data entries are often
 based on guesswork and these guesses may be corrected or improved.
 

 
 

 Timezone boundaries are not part of the stable interface.
 For example, even though the Asia/Bangkok timezone
 currently includes Chang Mai, Hanoi, and Phnom Penh, this is not part
 of the stable interface and the timezone can split at any time.
 If a calendar application records a future event in some location other
 than Bangkok by putting "Asia/Bangkok" in the event's record,
 the application should be robust in the presence of timezone splits
 between now and the future time.
 

 

 
 

   
Leap seconds

 

 The tz code and data can account for leap seconds,
 thanks to code contributed by Bradley White.
 However, the leap second support of this package is rarely used directly
 because POSIX requires leap seconds to be excluded and many
 software packages would mishandle leap seconds if they were present.
 Instead, leap seconds are more commonly handled by occasionally adjusting
 the operating system kernel clock as described in
 Precision timekeeping,
 and this package by default installs a leapseconds file
 commonly used by
 NTP
 software that adjusts the kernel clock.
 However, kernel-clock twiddling approximates UTC only roughly,
 and systems needing more-precise UTC can use this package's leap
 second support directly.
 

 
 

 The directly-supported mechanism assumes that time_t
 counts of seconds since the POSIX epoch normally include leap seconds,
 as opposed to POSIX time_t counts which exclude leap seconds.
 This modified timescale is converted to UTC
 at the same point that time zone and DST
 adjustments are applied –
 namely, at calls to localtime and analogous functions –
 and the process is driven by leap second information
 stored in alternate versions of the TZif files.
 Because a leap second adjustment may be needed even
 if no time zone correction is desired,
 calls to gmtime-like functions
 also need to consult a TZif file,
 conventionally named Etc/UTC
 (GMT in previous versions),
 to see whether leap second corrections are needed.
 To convert an application's time_t timestamps to or from
 POSIX time_t timestamps (for use when, say,
 embedding or interpreting timestamps in portable
 tar
 files),
 the application can call the utility functions
 time2posix and posix2time
 included with this package.
 

 
 

 If the POSIX-compatible TZif file set is installed
 in a directory whose basename is zoneinfo, the
 leap-second-aware file set is by default installed in a separate
 directory zoneinfo-leaps.
 Although each process can have its own time zone by setting
 its TZ environment variable, there is no support for some
 processes being leap-second aware while other processes are
 POSIX-compatible; the leap-second choice is system-wide.
 So if you configure your kernel to count leap seconds, you should also
 discard zoneinfo and rename zoneinfo-leaps
 to zoneinfo.
 Alternatively, you can install just one set of TZif files
 in the first place; see the REDO variable in this package's
 makefile.
 

 

 
 

   
Calendrical issues

 

 Calendrical issues are a bit out of scope for a time zone database,
 but they indicate the sort of problems that we would run into if we
 extended the time zone database further into the past.
 An excellent resource in this area is Edward M. Reingold
 and Nachum Dershowitz, Calendrical
 Calculations: The Ultimate Edition, Cambridge University Press (2018).
 Other information and sources are given in the file 'calendars'
 in the tz distribution.
 They sometimes disagree.
 

 

 
 

   
Time and time zones on other planets

 

 Some people's work schedules have used
 Mars time.
 Jet Propulsion Laboratory (JPL) coordinators kept Mars time on
 and off during the
 Mars
 Pathfinder mission (1997).
 Some of their family members also adapted to Mars time.
 Dozens of special Mars watches were built for JPL workers who kept
 Mars time during the
 Mars
 Exploration Rovers (MER) mission (2004–2018).
 These timepieces looked like normal Seikos and Citizens but were adjusted
 to use Mars seconds rather than terrestrial seconds, although
 unfortunately the adjusted watches were unreliable and appear to have
 had only limited use.
 

 
 

 A Mars solar day is called a "sol" and has a mean period equal to
 about 24 hours 39 minutes 35.244 seconds in terrestrial time.
 It is divided into a conventional 24-hour clock, so each Mars second
 equals about 1.02749125 terrestrial seconds.
 (One MER worker noted, "If I am working Mars hours, and Mars hours are
 2.5% more than Earth hours, shouldn't I get an extra 2.5% pay raise?")
 

 
 

 The prime
 meridian of Mars goes through the center of the crater
 Airy-0, named in
 honor of the British astronomer who built the Greenwich telescope that
 defines Earth's prime meridian.
 Mean solar time on the Mars prime meridian is
 called Mars Coordinated Time (MTC).
 

 
 

 Each landed mission on Mars has adopted a different reference for
 solar timekeeping, so there is no real standard for Mars time zones.
 For example, the MER mission defined two time zones "Local
 Solar Time A" and "Local Solar Time B" for its two missions, each zone
 designed so that its time equals local true solar time at
 approximately the middle of the nominal mission.
 The A and B zones differ enough so that an MER worker assigned to
 the A zone might suffer "Mars lag" when switching to work in the B zone.
 Such a "time zone" is not particularly suited for any application
 other than the mission itself.
 

 
 

 Many calendars have been proposed for Mars, but none have achieved
 wide acceptance.
 Astronomers often use Mars Sol Date (MSD) which is a
 sequential count of Mars solar days elapsed since about 1873-12-29
 12:00 GMT.
 

 
 

 In our solar system, Mars is the planet with time and calendar most
 like Earth's.
 On other planets, Sun-based time and calendars would work quite
 differently.
 For example, although Mercury's
 sidereal
 rotation period is 58.646 Earth days, Mercury revolves around the
 Sun so rapidly that an observer on Mercury's equator would see a
 sunrise only every 175.97 Earth days, i.e., a Mercury year is 0.5 of a
 Mercury day.
 Venus is more complicated, partly because its rotation is slightly
 retrograde:
 its year is 1.92 of its days.
 Gas giants like Jupiter are trickier still, as their polar and
 equatorial regions rotate at different rates, so that the length of a
 day depends on latitude.
 This effect is most pronounced on Neptune, where the day is about 12
 hours at the poles and 18 hours at the equator.
 

 
 

 Although the tz database does not support
 time on other planets, it is documented here in the hopes that support
 will be added eventually.
 

 
 

 Sources for time on other planets:
 

 
 
 

 
 

   

   This file is in the public domain, so clarified as of 2009-05-17 by
   Arthur David Olson.
 

 
 
diff --git a/version b/version
index 5c8fbb478a2c..b74fa117a223 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2022f
+2022g
diff --git a/zone.tab b/zone.tab
index 2636e21a9fca..6e5adb9fcca6 100644
--- a/zone.tab
+++ b/zone.tab
@@ -1,449 +1,449 @@
 # tzdb timezone descriptions (deprecated version)
 #
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 #
 # From Paul Eggert (2021-09-20):
 # This file is intended as a backward-compatibility aid for older programs.
 # New programs should use zone1970.tab.  This file is like zone1970.tab (see
 # zone1970.tab's comments), but with the following additional restrictions:
 #
 # 1.  This file contains only ASCII characters.
 # 2.  The first data column contains exactly one country code.
 #
 # Because of (2), each row stands for an area that is the intersection
 # of a region identified by a country code and of a timezone where civil
 # clocks have agreed since 1970; this is a narrower definition than
 # that of zone1970.tab.
 #
 # Unlike zone1970.tab, a row's third column can be a Link from
 # 'backward' instead of a Zone.
 #
 # This table is intended as an aid for users, to help them select timezones
 # appropriate for their practical needs.  It is not intended to take or
 # endorse any position on legal or territorial claims.
 #
 #country-
 #code	coordinates	TZ			comments
 AD	+4230+00131	Europe/Andorra
 AE	+2518+05518	Asia/Dubai
 AF	+3431+06912	Asia/Kabul
 AG	+1703-06148	America/Antigua
 AI	+1812-06304	America/Anguilla
 AL	+4120+01950	Europe/Tirane
 AM	+4011+04430	Asia/Yerevan
 AO	-0848+01314	Africa/Luanda
 AQ	-7750+16636	Antarctica/McMurdo	New Zealand time - McMurdo, South Pole
 AQ	-6617+11031	Antarctica/Casey	Casey
 AQ	-6835+07758	Antarctica/Davis	Davis
 AQ	-6640+14001	Antarctica/DumontDUrville	Dumont-d'Urville
 AQ	-6736+06253	Antarctica/Mawson	Mawson
 AQ	-6448-06406	Antarctica/Palmer	Palmer
 AQ	-6734-06808	Antarctica/Rothera	Rothera
 AQ	-690022+0393524	Antarctica/Syowa	Syowa
 AQ	-720041+0023206	Antarctica/Troll	Troll
 AQ	-7824+10654	Antarctica/Vostok	Vostok
 AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
 AR	-3124-06411	America/Argentina/Cordoba	Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
 AR	-2447-06525	America/Argentina/Salta	Salta (SA, LP, NQ, RN)
 AR	-2411-06518	America/Argentina/Jujuy	Jujuy (JY)
 AR	-2649-06513	America/Argentina/Tucuman	Tucuman (TM)
 AR	-2828-06547	America/Argentina/Catamarca	Catamarca (CT); Chubut (CH)
 AR	-2926-06651	America/Argentina/La_Rioja	La Rioja (LR)
 AR	-3132-06831	America/Argentina/San_Juan	San Juan (SJ)
 AR	-3253-06849	America/Argentina/Mendoza	Mendoza (MZ)
 AR	-3319-06621	America/Argentina/San_Luis	San Luis (SL)
 AR	-5138-06913	America/Argentina/Rio_Gallegos	Santa Cruz (SC)
 AR	-5448-06818	America/Argentina/Ushuaia	Tierra del Fuego (TF)
 AS	-1416-17042	Pacific/Pago_Pago
 AT	+4813+01620	Europe/Vienna
 AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
 AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
 AU	-4253+14719	Australia/Hobart	Tasmania
 AU	-3749+14458	Australia/Melbourne	Victoria
 AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
 AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
 AU	-2728+15302	Australia/Brisbane	Queensland (most areas)
 AU	-2016+14900	Australia/Lindeman	Queensland (Whitsunday Islands)
 AU	-3455+13835	Australia/Adelaide	South Australia
 AU	-1228+13050	Australia/Darwin	Northern Territory
 AU	-3157+11551	Australia/Perth	Western Australia (most areas)
 AU	-3143+12852	Australia/Eucla	Western Australia (Eucla)
 AW	+1230-06958	America/Aruba
 AX	+6006+01957	Europe/Mariehamn
 AZ	+4023+04951	Asia/Baku
 BA	+4352+01825	Europe/Sarajevo
 BB	+1306-05937	America/Barbados
 BD	+2343+09025	Asia/Dhaka
 BE	+5050+00420	Europe/Brussels
 BF	+1222-00131	Africa/Ouagadougou
 BG	+4241+02319	Europe/Sofia
 BH	+2623+05035	Asia/Bahrain
 BI	-0323+02922	Africa/Bujumbura
 BJ	+0629+00237	Africa/Porto-Novo
 BL	+1753-06251	America/St_Barthelemy
 BM	+3217-06446	Atlantic/Bermuda
 BN	+0456+11455	Asia/Brunei
 BO	-1630-06809	America/La_Paz
 BQ	+120903-0681636	America/Kralendijk
 BR	-0351-03225	America/Noronha	Atlantic islands
 BR	-0127-04829	America/Belem	Para (east); Amapa
 BR	-0343-03830	America/Fortaleza	Brazil (northeast: MA, PI, CE, RN, PB)
 BR	-0803-03454	America/Recife	Pernambuco
 BR	-0712-04812	America/Araguaina	Tocantins
 BR	-0940-03543	America/Maceio	Alagoas, Sergipe
 BR	-1259-03831	America/Bahia	Bahia
 BR	-2332-04637	America/Sao_Paulo	Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
 BR	-2027-05437	America/Campo_Grande	Mato Grosso do Sul
 BR	-1535-05605	America/Cuiaba	Mato Grosso
 BR	-0226-05452	America/Santarem	Para (west)
 BR	-0846-06354	America/Porto_Velho	Rondonia
 BR	+0249-06040	America/Boa_Vista	Roraima
 BR	-0308-06001	America/Manaus	Amazonas (east)
 BR	-0640-06952	America/Eirunepe	Amazonas (west)
 BR	-0958-06748	America/Rio_Branco	Acre
 BS	+2505-07721	America/Nassau
 BT	+2728+08939	Asia/Thimphu
 BW	-2439+02555	Africa/Gaborone
 BY	+5354+02734	Europe/Minsk
 BZ	+1730-08812	America/Belize
 CA	+4734-05243	America/St_Johns	Newfoundland; Labrador (southeast)
 CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
 CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
 CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
 CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
 CA	+5125-05707	America/Blanc-Sablon	AST - QC (Lower North Shore)
 CA	+4339-07923	America/Toronto	Eastern - ON, QC (most areas)
-CA	+6344-06828	America/Iqaluit	Eastern - NU (most east areas)
-CA	+6608-06544	America/Pangnirtung	Eastern - NU (Pangnirtung)
+CA	+6344-06828	America/Iqaluit	Eastern - NU (most areas)
 CA	+484531-0913718	America/Atikokan	EST - ON (Atikokan); NU (Coral H)
 CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
 CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
 CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
 CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
 CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
 CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
 CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
 CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
 CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
 CA	+6404-13925	America/Dawson	MST - Yukon (west)
 CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
 CC	-1210+09655	Indian/Cocos
 CD	-0418+01518	Africa/Kinshasa	Dem. Rep. of Congo (west)
 CD	-1140+02728	Africa/Lubumbashi	Dem. Rep. of Congo (east)
 CF	+0422+01835	Africa/Bangui
 CG	-0416+01517	Africa/Brazzaville
 CH	+4723+00832	Europe/Zurich
 CI	+0519-00402	Africa/Abidjan
 CK	-2114-15946	Pacific/Rarotonga
 CL	-3327-07040	America/Santiago	Chile (most areas)
 CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
 CL	-2709-10926	Pacific/Easter	Easter Island
 CM	+0403+00942	Africa/Douala
 CN	+3114+12128	Asia/Shanghai	Beijing Time
 CN	+4348+08735	Asia/Urumqi	Xinjiang Time
 CO	+0436-07405	America/Bogota
 CR	+0956-08405	America/Costa_Rica
 CU	+2308-08222	America/Havana
 CV	+1455-02331	Atlantic/Cape_Verde
 CW	+1211-06900	America/Curacao
 CX	-1025+10543	Indian/Christmas
 CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
 CY	+3507+03357	Asia/Famagusta	Northern Cyprus
 CZ	+5005+01426	Europe/Prague
 DE	+5230+01322	Europe/Berlin	Germany (most areas)
 DE	+4742+00841	Europe/Busingen	Busingen
 DJ	+1136+04309	Africa/Djibouti
 DK	+5540+01235	Europe/Copenhagen
 DM	+1518-06124	America/Dominica
 DO	+1828-06954	America/Santo_Domingo
 DZ	+3647+00303	Africa/Algiers
 EC	-0210-07950	America/Guayaquil	Ecuador (mainland)
 EC	-0054-08936	Pacific/Galapagos	Galapagos Islands
 EE	+5925+02445	Europe/Tallinn
 EG	+3003+03115	Africa/Cairo
 EH	+2709-01312	Africa/El_Aaiun
 ER	+1520+03853	Africa/Asmara
 ES	+4024-00341	Europe/Madrid	Spain (mainland)
 ES	+3553-00519	Africa/Ceuta	Ceuta, Melilla
 ES	+2806-01524	Atlantic/Canary	Canary Islands
 ET	+0902+03842	Africa/Addis_Ababa
 FI	+6010+02458	Europe/Helsinki
 FJ	-1808+17825	Pacific/Fiji
 FK	-5142-05751	Atlantic/Stanley
 FM	+0725+15147	Pacific/Chuuk	Chuuk/Truk, Yap
 FM	+0658+15813	Pacific/Pohnpei	Pohnpei/Ponape
 FM	+0519+16259	Pacific/Kosrae	Kosrae
 FO	+6201-00646	Atlantic/Faroe
 FR	+4852+00220	Europe/Paris
 GA	+0023+00927	Africa/Libreville
 GB	+513030-0000731	Europe/London
 GD	+1203-06145	America/Grenada
 GE	+4143+04449	Asia/Tbilisi
 GF	+0456-05220	America/Cayenne
 GG	+492717-0023210	Europe/Guernsey
 GH	+0533-00013	Africa/Accra
 GI	+3608-00521	Europe/Gibraltar
 GL	+6411-05144	America/Nuuk	Greenland (most areas)
 GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
 GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
 GL	+7634-06847	America/Thule	Thule/Pituffik
 GM	+1328-01639	Africa/Banjul
 GN	+0931-01343	Africa/Conakry
 GP	+1614-06132	America/Guadeloupe
 GQ	+0345+00847	Africa/Malabo
 GR	+3758+02343	Europe/Athens
 GS	-5416-03632	Atlantic/South_Georgia
 GT	+1438-09031	America/Guatemala
 GU	+1328+14445	Pacific/Guam
 GW	+1151-01535	Africa/Bissau
 GY	+0648-05810	America/Guyana
 HK	+2217+11409	Asia/Hong_Kong
 HN	+1406-08713	America/Tegucigalpa
 HR	+4548+01558	Europe/Zagreb
 HT	+1832-07220	America/Port-au-Prince
 HU	+4730+01905	Europe/Budapest
 ID	-0610+10648	Asia/Jakarta	Java, Sumatra
 ID	-0002+10920	Asia/Pontianak	Borneo (west, central)
 ID	-0507+11924	Asia/Makassar	Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
 ID	-0232+14042	Asia/Jayapura	New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
 IE	+5320-00615	Europe/Dublin
 IL	+314650+0351326	Asia/Jerusalem
 IM	+5409-00428	Europe/Isle_of_Man
 IN	+2232+08822	Asia/Kolkata
 IO	-0720+07225	Indian/Chagos
 IQ	+3321+04425	Asia/Baghdad
 IR	+3540+05126	Asia/Tehran
 IS	+6409-02151	Atlantic/Reykjavik
 IT	+4154+01229	Europe/Rome
 JE	+491101-0020624	Europe/Jersey
 JM	+175805-0764736	America/Jamaica
 JO	+3157+03556	Asia/Amman
 JP	+353916+1394441	Asia/Tokyo
 KE	-0117+03649	Africa/Nairobi
 KG	+4254+07436	Asia/Bishkek
 KH	+1133+10455	Asia/Phnom_Penh
 KI	+0125+17300	Pacific/Tarawa	Gilbert Islands
 KI	-0247-17143	Pacific/Kanton	Phoenix Islands
 KI	+0152-15720	Pacific/Kiritimati	Line Islands
 KM	-1141+04316	Indian/Comoro
 KN	+1718-06243	America/St_Kitts
 KP	+3901+12545	Asia/Pyongyang
 KR	+3733+12658	Asia/Seoul
 KW	+2920+04759	Asia/Kuwait
 KY	+1918-08123	America/Cayman
 KZ	+4315+07657	Asia/Almaty	Kazakhstan (most areas)
 KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda/Kyzylorda/Kzyl-Orda
 KZ	+5312+06337	Asia/Qostanay	Qostanay/Kostanay/Kustanay
 KZ	+5017+05710	Asia/Aqtobe	Aqtobe/Aktobe
 KZ	+4431+05016	Asia/Aqtau	Mangghystau/Mankistau
 KZ	+4707+05156	Asia/Atyrau	Atyrau/Atirau/Gur'yev
 KZ	+5113+05121	Asia/Oral	West Kazakhstan
 LA	+1758+10236	Asia/Vientiane
 LB	+3353+03530	Asia/Beirut
 LC	+1401-06100	America/St_Lucia
 LI	+4709+00931	Europe/Vaduz
 LK	+0656+07951	Asia/Colombo
 LR	+0618-01047	Africa/Monrovia
 LS	-2928+02730	Africa/Maseru
 LT	+5441+02519	Europe/Vilnius
 LU	+4936+00609	Europe/Luxembourg
 LV	+5657+02406	Europe/Riga
 LY	+3254+01311	Africa/Tripoli
 MA	+3339-00735	Africa/Casablanca
 MC	+4342+00723	Europe/Monaco
 MD	+4700+02850	Europe/Chisinau
 ME	+4226+01916	Europe/Podgorica
 MF	+1804-06305	America/Marigot
 MG	-1855+04731	Indian/Antananarivo
 MH	+0709+17112	Pacific/Majuro	Marshall Islands (most areas)
 MH	+0905+16720	Pacific/Kwajalein	Kwajalein
 MK	+4159+02126	Europe/Skopje
 ML	+1239-00800	Africa/Bamako
 MM	+1647+09610	Asia/Yangon
 MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
 MN	+4801+09139	Asia/Hovd	Bayan-Olgiy, Govi-Altai, Hovd, Uvs, Zavkhan
 MN	+4804+11430	Asia/Choibalsan	Dornod, Sukhbaatar
 MO	+221150+1133230	Asia/Macau
 MP	+1512+14545	Pacific/Saipan
 MQ	+1436-06105	America/Martinique
 MR	+1806-01557	Africa/Nouakchott
 MS	+1643-06213	America/Montserrat
 MT	+3554+01431	Europe/Malta
 MU	-2010+05730	Indian/Mauritius
 MV	+0410+07330	Indian/Maldives
 MW	-1547+03500	Africa/Blantyre
-MX	+1924-09909	America/Mexico_City	Central Time
-MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
-MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatan
-MX	+2540-10019	America/Monterrey	Central Time - Durango; Coahuila, Nuevo Leon, Tamaulipas (most areas)
-MX	+2550-09730	America/Matamoros	Central Time US - Coahuila, Nuevo Leon, Tamaulipas (US border)
-MX	+2313-10625	America/Mazatlan	Mountain Time - Baja California Sur, Nayarit, Sinaloa
-MX	+2838-10605	America/Chihuahua	Mountain Time - Chihuahua (most areas)
-MX	+2934-10425	America/Ojinaga	Mountain Time US - Chihuahua (US border)
-MX	+2904-11058	America/Hermosillo	Mountain Standard Time - Sonora
-MX	+3232-11701	America/Tijuana	Pacific Time US - Baja California
-MX	+2048-10515	America/Bahia_Banderas	Central Time - Bahia de Banderas
+MX	+1924-09909	America/Mexico_City	Central Mexico
+MX	+2105-08646	America/Cancun	Quintana Roo
+MX	+2058-08937	America/Merida	Campeche, Yucatan
+MX	+2540-10019	America/Monterrey	Durango; Coahuila, Nuevo Leon, Tamaulipas (most areas)
+MX	+2550-09730	America/Matamoros	Coahuila, Nuevo Leon, Tamaulipas (US border)
+MX	+2838-10605	America/Chihuahua	Chihuahua (most areas)
+MX	+3144-10629	America/Ciudad_Juarez	Chihuahua (US border - west)
+MX	+2934-10425	America/Ojinaga	Chihuahua (US border - east)
+MX	+2313-10625	America/Mazatlan	Baja California Sur, Nayarit (most areas), Sinaloa
+MX	+2048-10515	America/Bahia_Banderas	Bahia de Banderas
+MX	+2904-11058	America/Hermosillo	Sonora
+MX	+3232-11701	America/Tijuana	Baja California
 MY	+0310+10142	Asia/Kuala_Lumpur	Malaysia (peninsula)
 MY	+0133+11020	Asia/Kuching	Sabah, Sarawak
 MZ	-2558+03235	Africa/Maputo
 NA	-2234+01706	Africa/Windhoek
 NC	-2216+16627	Pacific/Noumea
 NE	+1331+00207	Africa/Niamey
 NF	-2903+16758	Pacific/Norfolk
 NG	+0627+00324	Africa/Lagos
 NI	+1209-08617	America/Managua
 NL	+5222+00454	Europe/Amsterdam
 NO	+5955+01045	Europe/Oslo
 NP	+2743+08519	Asia/Kathmandu
 NR	-0031+16655	Pacific/Nauru
 NU	-1901-16955	Pacific/Niue
 NZ	-3652+17446	Pacific/Auckland	New Zealand (most areas)
 NZ	-4357-17633	Pacific/Chatham	Chatham Islands
 OM	+2336+05835	Asia/Muscat
 PA	+0858-07932	America/Panama
 PE	-1203-07703	America/Lima
 PF	-1732-14934	Pacific/Tahiti	Society Islands
 PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
 PF	-2308-13457	Pacific/Gambier	Gambier Islands
 PG	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas)
 PG	-0613+15534	Pacific/Bougainville	Bougainville
 PH	+1435+12100	Asia/Manila
 PK	+2452+06703	Asia/Karachi
 PL	+5215+02100	Europe/Warsaw
 PM	+4703-05620	America/Miquelon
 PN	-2504-13005	Pacific/Pitcairn
 PR	+182806-0660622	America/Puerto_Rico
 PS	+3130+03428	Asia/Gaza	Gaza Strip
 PS	+313200+0350542	Asia/Hebron	West Bank
 PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
 PT	+3238-01654	Atlantic/Madeira	Madeira Islands
 PT	+3744-02540	Atlantic/Azores	Azores
 PW	+0720+13429	Pacific/Palau
 PY	-2516-05740	America/Asuncion
 QA	+2517+05132	Asia/Qatar
 RE	-2052+05528	Indian/Reunion
 RO	+4426+02606	Europe/Bucharest
 RS	+4450+02030	Europe/Belgrade
 RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
 RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
 # The obsolescent zone.tab format cannot represent Europe/Simferopol well.
 # Put it in RU section and list as UA.  See "territorial claims" above.
 # Programs should use zone1970.tab instead; see above.
 UA	+4457+03406	Europe/Simferopol	Crimea
 RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
 RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
 RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
 RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
 RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
 RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
 RU	+5651+06036	Asia/Yekaterinburg	MSK+02 - Urals
 RU	+5500+07324	Asia/Omsk	MSK+03 - Omsk
 RU	+5502+08255	Asia/Novosibirsk	MSK+04 - Novosibirsk
 RU	+5322+08345	Asia/Barnaul	MSK+04 - Altai
 RU	+5630+08458	Asia/Tomsk	MSK+04 - Tomsk
 RU	+5345+08707	Asia/Novokuznetsk	MSK+04 - Kemerovo
 RU	+5601+09250	Asia/Krasnoyarsk	MSK+04 - Krasnoyarsk area
 RU	+5216+10420	Asia/Irkutsk	MSK+05 - Irkutsk, Buryatia
 RU	+5203+11328	Asia/Chita	MSK+06 - Zabaykalsky
 RU	+6200+12940	Asia/Yakutsk	MSK+06 - Lena River
 RU	+623923+1353314	Asia/Khandyga	MSK+06 - Tomponsky, Ust-Maysky
 RU	+4310+13156	Asia/Vladivostok	MSK+07 - Amur River
 RU	+643337+1431336	Asia/Ust-Nera	MSK+07 - Oymyakonsky
 RU	+5934+15048	Asia/Magadan	MSK+08 - Magadan
 RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
 RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
 RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
 RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
 RW	-0157+03004	Africa/Kigali
 SA	+2438+04643	Asia/Riyadh
 SB	-0932+16012	Pacific/Guadalcanal
 SC	-0440+05528	Indian/Mahe
 SD	+1536+03232	Africa/Khartoum
 SE	+5920+01803	Europe/Stockholm
 SG	+0117+10351	Asia/Singapore
 SH	-1555-00542	Atlantic/St_Helena
 SI	+4603+01431	Europe/Ljubljana
 SJ	+7800+01600	Arctic/Longyearbyen
 SK	+4809+01707	Europe/Bratislava
 SL	+0830-01315	Africa/Freetown
 SM	+4355+01228	Europe/San_Marino
 SN	+1440-01726	Africa/Dakar
 SO	+0204+04522	Africa/Mogadishu
 SR	+0550-05510	America/Paramaribo
 SS	+0451+03137	Africa/Juba
 ST	+0020+00644	Africa/Sao_Tome
 SV	+1342-08912	America/El_Salvador
 SX	+180305-0630250	America/Lower_Princes
 SY	+3330+03618	Asia/Damascus
 SZ	-2618+03106	Africa/Mbabane
 TC	+2128-07108	America/Grand_Turk
 TD	+1207+01503	Africa/Ndjamena
 TF	-492110+0701303	Indian/Kerguelen
 TG	+0608+00113	Africa/Lome
 TH	+1345+10031	Asia/Bangkok
 TJ	+3835+06848	Asia/Dushanbe
 TK	-0922-17114	Pacific/Fakaofo
 TL	-0833+12535	Asia/Dili
 TM	+3757+05823	Asia/Ashgabat
 TN	+3648+01011	Africa/Tunis
 TO	-210800-1751200	Pacific/Tongatapu
 TR	+4101+02858	Europe/Istanbul
 TT	+1039-06131	America/Port_of_Spain
 TV	-0831+17913	Pacific/Funafuti
 TW	+2503+12130	Asia/Taipei
 TZ	-0648+03917	Africa/Dar_es_Salaam
 UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
 UG	+0019+03225	Africa/Kampala
 UM	+2813-17722	Pacific/Midway	Midway Islands
 UM	+1917+16637	Pacific/Wake	Wake Island
 US	+404251-0740023	America/New_York	Eastern (most areas)
 US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
 US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
 US	+364947-0845057	America/Kentucky/Monticello	Eastern - KY (Wayne)
 US	+394606-0860929	America/Indiana/Indianapolis	Eastern - IN (most areas)
 US	+384038-0873143	America/Indiana/Vincennes	Eastern - IN (Da, Du, K, Mn)
 US	+410305-0863611	America/Indiana/Winamac	Eastern - IN (Pulaski)
 US	+382232-0862041	America/Indiana/Marengo	Eastern - IN (Crawford)
 US	+382931-0871643	America/Indiana/Petersburg	Eastern - IN (Pike)
 US	+384452-0850402	America/Indiana/Vevay	Eastern - IN (Switzerland)
 US	+415100-0873900	America/Chicago	Central (most areas)
 US	+375711-0864541	America/Indiana/Tell_City	Central - IN (Perry)
 US	+411745-0863730	America/Indiana/Knox	Central - IN (Starke)
 US	+450628-0873651	America/Menominee	Central - MI (Wisconsin border)
 US	+470659-1011757	America/North_Dakota/Center	Central - ND (Oliver)
 US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
 US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
 US	+394421-1045903	America/Denver	Mountain (most areas)
 US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
 US	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo)
 US	+340308-1181434	America/Los_Angeles	Pacific
 US	+611305-1495401	America/Anchorage	Alaska (most areas)
 US	+581807-1342511	America/Juneau	Alaska - Juneau area
 US	+571035-1351807	America/Sitka	Alaska - Sitka area
 US	+550737-1313435	America/Metlakatla	Alaska - Annette Island
 US	+593249-1394338	America/Yakutat	Alaska - Yakutat
 US	+643004-1652423	America/Nome	Alaska (west)
 US	+515248-1763929	America/Adak	Aleutian Islands
 US	+211825-1575130	Pacific/Honolulu	Hawaii
 UY	-345433-0561245	America/Montevideo
 UZ	+3940+06648	Asia/Samarkand	Uzbekistan (west)
 UZ	+4120+06918	Asia/Tashkent	Uzbekistan (east)
 VA	+415408+0122711	Europe/Vatican
 VC	+1309-06114	America/St_Vincent
 VE	+1030-06656	America/Caracas
 VG	+1827-06437	America/Tortola
 VI	+1821-06456	America/St_Thomas
 VN	+1045+10640	Asia/Ho_Chi_Minh
 VU	-1740+16825	Pacific/Efate
 WF	-1318-17610	Pacific/Wallis
 WS	-1350-17144	Pacific/Apia
 YE	+1245+04512	Asia/Aden
 YT	-1247+04514	Indian/Mayotte
 ZA	-2615+02800	Africa/Johannesburg
 ZM	-1525+02817	Africa/Lusaka
 ZW	-1750+03103	Africa/Harare
diff --git a/zone1970.tab b/zone1970.tab
index 75372e3fa422..a9b36d36a56a 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -1,372 +1,372 @@
 # tzdb timezone descriptions
 #
 # This file is in the public domain.
 #
 # From Paul Eggert (2018-06-27):
 # This file contains a table where each row stands for a timezone where
 # civil timestamps have agreed since 1970.  Columns are separated by
 # a single tab.  Lines beginning with '#' are comments.  All text uses
 # UTF-8 encoding.  The columns of the table are as follows:
 #
 # 1.  The countries that overlap the timezone, as a comma-separated list
 #     of ISO 3166 2-character country codes.  See the file 'iso3166.tab'.
 # 2.  Latitude and longitude of the timezone's principal location
 #     in ISO 6709 sign-degrees-minutes-seconds format,
 #     either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
 #     first latitude (+ is north), then longitude (+ is east).
 # 3.  Timezone name used in value of TZ environment variable.
 #     Please see the theory.html file for how these names are chosen.
 #     If multiple timezones overlap a country, each has a row in the
 #     table, with each column 1 containing the country code.
 # 4.  Comments; present if and only if a country has multiple timezones.
 #
 # If a timezone covers multiple countries, the most-populous city is used,
 # and that country is listed first in column 1; any other countries
 # are listed alphabetically by country code.  The table is sorted
 # first by country code, then (if possible) by an order within the
 # country that (1) makes some geographical sense, and (2) puts the
 # most populous timezones first, where that does not contradict (1).
 #
 # This table is intended as an aid for users, to help them select timezones
 # appropriate for their practical needs.  It is not intended to take or
 # endorse any position on legal or territorial claims.
 #
 #country-
 #codes	coordinates	TZ	comments
 AD	+4230+00131	Europe/Andorra
 AE,OM,RE,SC,TF	+2518+05518	Asia/Dubai	UAE, Oman, Réunion, Seychelles, Crozet, Scattered Is
 AF	+3431+06912	Asia/Kabul
 AL	+4120+01950	Europe/Tirane
 AM	+4011+04430	Asia/Yerevan
 AQ	-6617+11031	Antarctica/Casey	Casey
 AQ	-6835+07758	Antarctica/Davis	Davis
 AQ	-6736+06253	Antarctica/Mawson	Mawson
 AQ	-6448-06406	Antarctica/Palmer	Palmer
 AQ	-6734-06808	Antarctica/Rothera	Rothera
 AQ	-720041+0023206	Antarctica/Troll	Troll
 AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
 AR	-3124-06411	America/Argentina/Cordoba	Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
 AR	-2447-06525	America/Argentina/Salta	Salta (SA, LP, NQ, RN)
 AR	-2411-06518	America/Argentina/Jujuy	Jujuy (JY)
 AR	-2649-06513	America/Argentina/Tucuman	Tucumán (TM)
 AR	-2828-06547	America/Argentina/Catamarca	Catamarca (CT); Chubut (CH)
 AR	-2926-06651	America/Argentina/La_Rioja	La Rioja (LR)
 AR	-3132-06831	America/Argentina/San_Juan	San Juan (SJ)
 AR	-3253-06849	America/Argentina/Mendoza	Mendoza (MZ)
 AR	-3319-06621	America/Argentina/San_Luis	San Luis (SL)
 AR	-5138-06913	America/Argentina/Rio_Gallegos	Santa Cruz (SC)
 AR	-5448-06818	America/Argentina/Ushuaia	Tierra del Fuego (TF)
 AS,UM	-1416-17042	Pacific/Pago_Pago	Samoa, Midway
 AT	+4813+01620	Europe/Vienna
 AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
 AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
 AU	-4253+14719	Australia/Hobart	Tasmania
 AU	-3749+14458	Australia/Melbourne	Victoria
 AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
 AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
 AU	-2728+15302	Australia/Brisbane	Queensland (most areas)
 AU	-2016+14900	Australia/Lindeman	Queensland (Whitsunday Islands)
 AU	-3455+13835	Australia/Adelaide	South Australia
 AU	-1228+13050	Australia/Darwin	Northern Territory
 AU	-3157+11551	Australia/Perth	Western Australia (most areas)
 AU	-3143+12852	Australia/Eucla	Western Australia (Eucla)
 AZ	+4023+04951	Asia/Baku
 BB	+1306-05937	America/Barbados
 BD	+2343+09025	Asia/Dhaka
 BE,LU,NL	+5050+00420	Europe/Brussels
 BG	+4241+02319	Europe/Sofia
 BM	+3217-06446	Atlantic/Bermuda
 BO	-1630-06809	America/La_Paz
 BR	-0351-03225	America/Noronha	Atlantic islands
 BR	-0127-04829	America/Belem	Pará (east); Amapá
 BR	-0343-03830	America/Fortaleza	Brazil (northeast: MA, PI, CE, RN, PB)
 BR	-0803-03454	America/Recife	Pernambuco
 BR	-0712-04812	America/Araguaina	Tocantins
 BR	-0940-03543	America/Maceio	Alagoas, Sergipe
 BR	-1259-03831	America/Bahia	Bahia
 BR	-2332-04637	America/Sao_Paulo	Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
 BR	-2027-05437	America/Campo_Grande	Mato Grosso do Sul
 BR	-1535-05605	America/Cuiaba	Mato Grosso
 BR	-0226-05452	America/Santarem	Pará (west)
 BR	-0846-06354	America/Porto_Velho	Rondônia
 BR	+0249-06040	America/Boa_Vista	Roraima
 BR	-0308-06001	America/Manaus	Amazonas (east)
 BR	-0640-06952	America/Eirunepe	Amazonas (west)
 BR	-0958-06748	America/Rio_Branco	Acre
 BT	+2728+08939	Asia/Thimphu
 BY	+5354+02734	Europe/Minsk
 BZ	+1730-08812	America/Belize
 CA	+4734-05243	America/St_Johns	Newfoundland; Labrador (southeast)
 CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
 CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
 CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
 CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
 CA,BS	+4339-07923	America/Toronto	Eastern - ON, QC (most areas), Bahamas
-CA	+6344-06828	America/Iqaluit	Eastern - NU (most east areas)
-CA	+6608-06544	America/Pangnirtung	Eastern - NU (Pangnirtung)
+CA	+6344-06828	America/Iqaluit	Eastern - NU (most areas)
 CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
 CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
 CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
 CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
 CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
 CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
 CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
 CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
 CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
 CA	+6404-13925	America/Dawson	MST - Yukon (west)
 CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
 CH,DE,LI	+4723+00832	Europe/Zurich	Swiss time
 CI,BF,GH,GM,GN,IS,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
 CK	-2114-15946	Pacific/Rarotonga
 CL	-3327-07040	America/Santiago	Chile (most areas)
 CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
 CL	-2709-10926	Pacific/Easter	Easter Island
 CN	+3114+12128	Asia/Shanghai	Beijing Time
 CN,AQ	+4348+08735	Asia/Urumqi	Xinjiang Time, Vostok
 CO	+0436-07405	America/Bogota
 CR	+0956-08405	America/Costa_Rica
 CU	+2308-08222	America/Havana
 CV	+1455-02331	Atlantic/Cape_Verde
 CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
 CY	+3507+03357	Asia/Famagusta	Northern Cyprus
 CZ,SK	+5005+01426	Europe/Prague
 DE,DK,NO,SE,SJ	+5230+01322	Europe/Berlin	Germany (most areas), Scandinavia
 DO	+1828-06954	America/Santo_Domingo
 DZ	+3647+00303	Africa/Algiers
 EC	-0210-07950	America/Guayaquil	Ecuador (mainland)
 EC	-0054-08936	Pacific/Galapagos	Galápagos Islands
 EE	+5925+02445	Europe/Tallinn
 EG	+3003+03115	Africa/Cairo
 EH	+2709-01312	Africa/El_Aaiun
 ES	+4024-00341	Europe/Madrid	Spain (mainland)
 ES	+3553-00519	Africa/Ceuta	Ceuta, Melilla
 ES	+2806-01524	Atlantic/Canary	Canary Islands
 FI,AX	+6010+02458	Europe/Helsinki
 FJ	-1808+17825	Pacific/Fiji
 FK	-5142-05751	Atlantic/Stanley
 FM	+0519+16259	Pacific/Kosrae	Kosrae
 FO	+6201-00646	Atlantic/Faroe
 FR,MC	+4852+00220	Europe/Paris
 GB,GG,IM,JE	+513030-0000731	Europe/London
 GE	+4143+04449	Asia/Tbilisi
 GF	+0456-05220	America/Cayenne
 GI	+3608-00521	Europe/Gibraltar
 GL	+6411-05144	America/Nuuk	Greenland (most areas)
 GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
 GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
 GL	+7634-06847	America/Thule	Thule/Pituffik
 GR	+3758+02343	Europe/Athens
 GS	-5416-03632	Atlantic/South_Georgia
 GT	+1438-09031	America/Guatemala
 GU,MP	+1328+14445	Pacific/Guam
 GW	+1151-01535	Africa/Bissau
 GY	+0648-05810	America/Guyana
 HK	+2217+11409	Asia/Hong_Kong
 HN	+1406-08713	America/Tegucigalpa
 HT	+1832-07220	America/Port-au-Prince
 HU	+4730+01905	Europe/Budapest
 ID	-0610+10648	Asia/Jakarta	Java, Sumatra
 ID	-0002+10920	Asia/Pontianak	Borneo (west, central)
 ID	-0507+11924	Asia/Makassar	Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
 ID	-0232+14042	Asia/Jayapura	New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
 IE	+5320-00615	Europe/Dublin
 IL	+314650+0351326	Asia/Jerusalem
 IN	+2232+08822	Asia/Kolkata
 IO	-0720+07225	Indian/Chagos
 IQ	+3321+04425	Asia/Baghdad
 IR	+3540+05126	Asia/Tehran
 IT,SM,VA	+4154+01229	Europe/Rome
 JM	+175805-0764736	America/Jamaica
 JO	+3157+03556	Asia/Amman
 JP	+353916+1394441	Asia/Tokyo
 KE,DJ,ER,ET,KM,MG,SO,TZ,UG,YT	-0117+03649	Africa/Nairobi
 KG	+4254+07436	Asia/Bishkek
 KI,MH,TV,UM,WF	+0125+17300	Pacific/Tarawa	Gilberts, Marshalls, Tuvalu, Wallis & Futuna, Wake
 KI	-0247-17143	Pacific/Kanton	Phoenix Islands
 KI	+0152-15720	Pacific/Kiritimati	Line Islands
 KP	+3901+12545	Asia/Pyongyang
 KR	+3733+12658	Asia/Seoul
 KZ	+4315+07657	Asia/Almaty	Kazakhstan (most areas)
 KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda/Kyzylorda/Kzyl-Orda
 KZ	+5312+06337	Asia/Qostanay	Qostanay/Kostanay/Kustanay
 KZ	+5017+05710	Asia/Aqtobe	Aqtöbe/Aktobe
 KZ	+4431+05016	Asia/Aqtau	Mangghystaū/Mankistau
 KZ	+4707+05156	Asia/Atyrau	Atyraū/Atirau/Gur'yev
 KZ	+5113+05121	Asia/Oral	West Kazakhstan
 LB	+3353+03530	Asia/Beirut
 LK	+0656+07951	Asia/Colombo
 LR	+0618-01047	Africa/Monrovia
 LT	+5441+02519	Europe/Vilnius
 LV	+5657+02406	Europe/Riga
 LY	+3254+01311	Africa/Tripoli
 MA	+3339-00735	Africa/Casablanca
 MD	+4700+02850	Europe/Chisinau
 MH	+0905+16720	Pacific/Kwajalein	Kwajalein
 MM,CC	+1647+09610	Asia/Yangon
 MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
 MN	+4801+09139	Asia/Hovd	Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
 MN	+4804+11430	Asia/Choibalsan	Dornod, Sükhbaatar
 MO	+221150+1133230	Asia/Macau
 MQ	+1436-06105	America/Martinique
 MT	+3554+01431	Europe/Malta
 MU	-2010+05730	Indian/Mauritius
 MV,TF	+0410+07330	Indian/Maldives	Maldives, Kerguelen, St Paul I, Amsterdam I
-MX	+1924-09909	America/Mexico_City	Central Time
-MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
-MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatán
-MX	+2540-10019	America/Monterrey	Central Time - Durango; Coahuila, Nuevo León, Tamaulipas (most areas)
-MX	+2550-09730	America/Matamoros	Central Time US - Coahuila, Nuevo León, Tamaulipas (US border)
-MX	+2313-10625	America/Mazatlan	Mountain Time - Baja California Sur, Nayarit, Sinaloa
-MX	+2838-10605	America/Chihuahua	Mountain Time - Chihuahua (most areas)
-MX	+2934-10425	America/Ojinaga	Mountain Time US - Chihuahua (US border)
-MX	+2904-11058	America/Hermosillo	Mountain Standard Time - Sonora
-MX	+3232-11701	America/Tijuana	Pacific Time US - Baja California
-MX	+2048-10515	America/Bahia_Banderas	Central Time - Bahía de Banderas
+MX	+1924-09909	America/Mexico_City	Central Mexico
+MX	+2105-08646	America/Cancun	Quintana Roo
+MX	+2058-08937	America/Merida	Campeche, Yucatán
+MX	+2540-10019	America/Monterrey	Durango; Coahuila, Nuevo León, Tamaulipas (most areas)
+MX	+2550-09730	America/Matamoros	Coahuila, Nuevo León, Tamaulipas (US border)
+MX	+2838-10605	America/Chihuahua	Chihuahua (most areas)
+MX	+3144-10629	America/Ciudad_Juarez	Chihuahua (US border - west)
+MX	+2934-10425	America/Ojinaga	Chihuahua (US border - east)
+MX	+2313-10625	America/Mazatlan	Baja California Sur, Nayarit (most areas), Sinaloa
+MX	+2048-10515	America/Bahia_Banderas	Bahía de Banderas
+MX	+2904-11058	America/Hermosillo	Sonora
+MX	+3232-11701	America/Tijuana	Baja California
 MY,BN	+0133+11020	Asia/Kuching	Sabah, Sarawak, Brunei
 MZ,BI,BW,CD,MW,RW,ZM,ZW	-2558+03235	Africa/Maputo	Central Africa Time
 NA	-2234+01706	Africa/Windhoek
 NC	-2216+16627	Pacific/Noumea
 NF	-2903+16758	Pacific/Norfolk
 NG,AO,BJ,CD,CF,CG,CM,GA,GQ,NE	+0627+00324	Africa/Lagos	West Africa Time
 NI	+1209-08617	America/Managua
 NP	+2743+08519	Asia/Kathmandu
 NR	-0031+16655	Pacific/Nauru
 NU	-1901-16955	Pacific/Niue
 NZ,AQ	-3652+17446	Pacific/Auckland	New Zealand time
 NZ	-4357-17633	Pacific/Chatham	Chatham Islands
 PA,CA,KY	+0858-07932	America/Panama	EST - Panama, Cayman, ON (Atikokan), NU (Coral H)
 PE	-1203-07703	America/Lima
 PF	-1732-14934	Pacific/Tahiti	Society Islands
 PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
 PF	-2308-13457	Pacific/Gambier	Gambier Islands
 PG,AQ,FM	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas), Chuuk, Yap, Dumont d'Urville
 PG	-0613+15534	Pacific/Bougainville	Bougainville
 PH	+1435+12100	Asia/Manila
 PK	+2452+06703	Asia/Karachi
 PL	+5215+02100	Europe/Warsaw
 PM	+4703-05620	America/Miquelon
 PN	-2504-13005	Pacific/Pitcairn
 PR,AG,CA,AI,AW,BL,BQ,CW,DM,GD,GP,KN,LC,MF,MS,SX,TT,VC,VG,VI	+182806-0660622	America/Puerto_Rico	AST
 PS	+3130+03428	Asia/Gaza	Gaza Strip
 PS	+313200+0350542	Asia/Hebron	West Bank
 PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
 PT	+3238-01654	Atlantic/Madeira	Madeira Islands
 PT	+3744-02540	Atlantic/Azores	Azores
 PW	+0720+13429	Pacific/Palau
 PY	-2516-05740	America/Asuncion
 QA,BH	+2517+05132	Asia/Qatar
 RO	+4426+02606	Europe/Bucharest
 RS,BA,HR,ME,MK,SI	+4450+02030	Europe/Belgrade
 RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
 RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
 # Mention RU and UA alphabetically.  See "territorial claims" above.
 RU,UA	+4457+03406	Europe/Simferopol	Crimea
 RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
 RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
 RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
 RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
 RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
 RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
 RU	+5651+06036	Asia/Yekaterinburg	MSK+02 - Urals
 RU	+5500+07324	Asia/Omsk	MSK+03 - Omsk
 RU	+5502+08255	Asia/Novosibirsk	MSK+04 - Novosibirsk
 RU	+5322+08345	Asia/Barnaul	MSK+04 - Altai
 RU	+5630+08458	Asia/Tomsk	MSK+04 - Tomsk
 RU	+5345+08707	Asia/Novokuznetsk	MSK+04 - Kemerovo
 RU	+5601+09250	Asia/Krasnoyarsk	MSK+04 - Krasnoyarsk area
 RU	+5216+10420	Asia/Irkutsk	MSK+05 - Irkutsk, Buryatia
 RU	+5203+11328	Asia/Chita	MSK+06 - Zabaykalsky
 RU	+6200+12940	Asia/Yakutsk	MSK+06 - Lena River
 RU	+623923+1353314	Asia/Khandyga	MSK+06 - Tomponsky, Ust-Maysky
 RU	+4310+13156	Asia/Vladivostok	MSK+07 - Amur River
 RU	+643337+1431336	Asia/Ust-Nera	MSK+07 - Oymyakonsky
 RU	+5934+15048	Asia/Magadan	MSK+08 - Magadan
 RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
 RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
 RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
 RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
 SA,AQ,KW,YE	+2438+04643	Asia/Riyadh	Arabia, Syowa
 SB,FM	-0932+16012	Pacific/Guadalcanal	Solomons, Pohnpei
 SD	+1536+03232	Africa/Khartoum
 SG,MY	+0117+10351	Asia/Singapore	Singapore, peninsular Malaysia
 SR	+0550-05510	America/Paramaribo
 SS	+0451+03137	Africa/Juba
 ST	+0020+00644	Africa/Sao_Tome
 SV	+1342-08912	America/El_Salvador
 SY	+3330+03618	Asia/Damascus
 TC	+2128-07108	America/Grand_Turk
 TD	+1207+01503	Africa/Ndjamena
 TH,CX,KH,LA,VN	+1345+10031	Asia/Bangkok	Indochina (most areas)
 TJ	+3835+06848	Asia/Dushanbe
 TK	-0922-17114	Pacific/Fakaofo
 TL	-0833+12535	Asia/Dili
 TM	+3757+05823	Asia/Ashgabat
 TN	+3648+01011	Africa/Tunis
 TO	-210800-1751200	Pacific/Tongatapu
 TR	+4101+02858	Europe/Istanbul
 TW	+2503+12130	Asia/Taipei
 UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
 US	+404251-0740023	America/New_York	Eastern (most areas)
 US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
 US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
 US	+364947-0845057	America/Kentucky/Monticello	Eastern - KY (Wayne)
 US	+394606-0860929	America/Indiana/Indianapolis	Eastern - IN (most areas)
 US	+384038-0873143	America/Indiana/Vincennes	Eastern - IN (Da, Du, K, Mn)
 US	+410305-0863611	America/Indiana/Winamac	Eastern - IN (Pulaski)
 US	+382232-0862041	America/Indiana/Marengo	Eastern - IN (Crawford)
 US	+382931-0871643	America/Indiana/Petersburg	Eastern - IN (Pike)
 US	+384452-0850402	America/Indiana/Vevay	Eastern - IN (Switzerland)
 US	+415100-0873900	America/Chicago	Central (most areas)
 US	+375711-0864541	America/Indiana/Tell_City	Central - IN (Perry)
 US	+411745-0863730	America/Indiana/Knox	Central - IN (Starke)
 US	+450628-0873651	America/Menominee	Central - MI (Wisconsin border)
 US	+470659-1011757	America/North_Dakota/Center	Central - ND (Oliver)
 US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
 US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
 US	+394421-1045903	America/Denver	Mountain (most areas)
 US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
 US,CA	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo), Creston BC
 US	+340308-1181434	America/Los_Angeles	Pacific
 US	+611305-1495401	America/Anchorage	Alaska (most areas)
 US	+581807-1342511	America/Juneau	Alaska - Juneau area
 US	+571035-1351807	America/Sitka	Alaska - Sitka area
 US	+550737-1313435	America/Metlakatla	Alaska - Annette Island
 US	+593249-1394338	America/Yakutat	Alaska - Yakutat
 US	+643004-1652423	America/Nome	Alaska (west)
 US	+515248-1763929	America/Adak	Aleutian Islands
 US,UM	+211825-1575130	Pacific/Honolulu	Hawaii
 UY	-345433-0561245	America/Montevideo
 UZ	+3940+06648	Asia/Samarkand	Uzbekistan (west)
 UZ	+4120+06918	Asia/Tashkent	Uzbekistan (east)
 VE	+1030-06656	America/Caracas
 VN	+1045+10640	Asia/Ho_Chi_Minh	Vietnam (south)
 VU	-1740+16825	Pacific/Efate
 WS	-1350-17144	Pacific/Apia
 ZA,LS,SZ	-2615+02800	Africa/Johannesburg
 #
 # The next section contains experimental tab-separated comments for
 # use by user agents like tzselect that identify continents and oceans.
 #
 # For example, the comment "#@AQAntarctica/" means the country code
 # AQ is in the continent Antarctica regardless of the Zone name,
 # so Pacific/Auckland should be listed under Antarctica as well as
 # under the Pacific because its line's country codes include AQ.
 #
 # If more than one country code is affected each is listed separated
 # by commas, e.g., #@IS,SHAtlantic/".  If a country code is in
 # more than one continent or ocean, each is listed separated by
 # commas, e.g., the second column of "#@CY,TRAsia/,Europe/".
 #
 # These experimental comments are present only for country codes where
 # the continent or ocean is not already obvious from the Zone name.
 # For example, there is no such comment for RU since it already
 # corresponds to Zone names starting with both "Europe/" and "Asia/".
 #
 #@AQ	Antarctica/
 #@IS,SH	Atlantic/
 #@CY,TR	Asia/,Europe/
 #@SJ	Arctic/
 #@CC,CX,KM,MG,YT	Indian/